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Tijdschrift voor Economische en Sociale Geografie – 2020,
DOI:10.1111/tesg.12362, Vol. 111, No. 1, pp. 60–79.
© 2019 Royal Dutch Geographical Society KNAG
THE GEOGRAPHY OF BORROWING SIZE:
EXPLORING SPATIAL DISTRIBUTIONS FOR
GERMAN URBAN REGIONS
KATI VOLGMANN & KARSTEN RUSCHE
Research Institute for Regional and Urban Development GmbH
(ILS), Brüderweg 22–24, 44135,
Dortmund, Germany. E-mail: [email protected];
[email protected]
(Corresponding author)
Received: June 2018; accepted: January 2019
ABSTRACT
This paper contributes to the discussion on borrowing size
effects. According to this concept,
smaller cities that are part of larger functional urban regions
can utilise metropolitan functions
and economic externalities, thereby boosting their regional
performance. This is conceptualised
in the four-dimension scheme of Meijers and Burger.
Consequently, this paper analytically
explores and operationalises the borrowed size concept and
reveals insights into the relation and
spatial distribution of four types of effects: borrowed size,
borrowed performance, borrowed
function and agglomeration shadow. Research on these spatial
effects is applied on a small-scale
spatial level and integrates all municipalities in German urban
regions. We find different
geographies of effects among the four-dimensions of borrowed
size. City size and centrality
degree show a significant influence on positioning in the four
borrowed size effect types.
Key words: Borrowed size, borrowed function, borrowed
performance, urban growth,
metropolitan functions, urban regions
INTRODUCTION
The current urban development in Europe can
be characterised by two important trends. In
many cases, the capacity to attract high-order
or metropolitan functions (Friedmann 1986;
Sassen 1991) and economic development are
decoupled from urban size effects (Camagni
& Capello 2015), which contradicts standard
agglomeration theories (Camagni et al. 2016).
There is no clear relationship between urban
scale or density and urban productivity (Cox
& Longlands 2016; McCann 2016). In addi-
tion, the spatial patterns of regional urban
growth in European regions are very hetero-
genic (Dijkstra et al. 2013) in their extent and
direction and are influenced by path depen-
dencies, different factor endowments and spe-
cific interregional dependencies within and
among urban regions (Camagni et al. 2016).
For regional policies and policy measures, it
is important to be able to identify and classify
the phase and spatial shape of regional de-
velopments to adapt the right kind of urban
policy (Dijkstra et al. 2013), as, for instance,
monocentric urban growth necessitates other
concepts of infrastructure plans than in more
polycentric city development.
In explaining these trends and develop-
ments, the contemporary literature high-
lights a complex understanding of urban
and regional growth, which is rooted in
different disciplinary and methodological
backgrounds. One interpretation of agglom-
eration economies and urban dynamics is
connected to the concept of ‘borrowing size’
(introduced by Alonso 1973; and reintro-
duced by Phelps et al. 2001 & Phelps 2004;
mailto:
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mailto:
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THE GEOGRAPHY OF BORROWING SIZE 61
© 2019 Royal Dutch Geographical Society KNAG
and currently discussed by Burger et al. 2015;
Meijers et al. 2016; Meijers & Burger 2017).
The theoretical underpinning of this con-
cept discusses the functional enrichment
of medium and small cities that are part of
larger functional urban regions, where such
cities are able to utilise metropolitan urban
functions and networks, thereby boosting
their regional performance (which can be
economic or demographic). In contrast, cit-
ies that fail to benefit from the functions and
power of bigger neighbours may experience
a ‘backwash’ or ‘agglomeration shadow’ ef-
fect. Here, a major urban core is dominant
in its metropolitan functions and economic
development compared to its hinterland
(Cardoso & Meijers 2016). The conceptual-
isation of the borrowing size dimensions by
Meijers and Burger (2017) provides a basis
for its operationalisation. The contemporary
empirical findings on the borrowed size con-
cept reveal a gap in urban research regard-
ing the empirical operationalisation and
analysis of the spatial distribution and classi-
fication of cities in urban regions on a small-
scale level using a solid set of indicators and
a consistent method.
In this paper, we briefly discuss the cur-
rent state of the art for the concept of bor-
rowed size, focusing on recent empirical
findings and advances in logical classifica-
tions (second section). The following section
introduces our study area – a set of large, me-
dium and small cities within the functional
German urban regions – and presents the
analytical methods and data used to em-
pirically explore the spatial heterogeneity
of borrowed size effects (third section). For
this, we analyse the spatial patterns of bor-
rowing size effects and the interrelations
among functions, performance and agglom-
eration shadow in the cities of the observed
German urban regions (fourth section). The
results of this empirical study are discussed
in the fifth section.
THEORETICAL FOUNDATION
Concept and origin of ‘borrowed size’ – The
origin of the borrowed size concept was intro-
duced by Alonso (1973, p. 200), who proposed
the idea that a smaller city ‘exhibits some of
the characteristics of a larger one if it is near
other population concentrations’. This analyt-
ical concept focuses on the understanding that
people and firms in smaller settlements (low
concentration and low rents) retain advantag-
es from their locality and are able to exploit
advantages from larger nearby settlements
(e.g. access to diverse market and services,
infrastructure, urban amenities) and avoid
agglomeration costs (Camagni et al. 2016; Mei-
jers & Burger 2017).
An investigation of economic developments
in Greater London by Phelps et al. (2001) tested
the concept and revealed evidence of borrowing
size effects in edge cities, whereby small firms
derived advantages from nearby larger urban
areas and not from their own local economy.
The concept of borrowed size refers to the pro-
cess of suburban growth interlinkages, to dis-
cussions on edge cities (Phelps 1998) and new
economic subcentres (Phelps 2004; Krehl 2015),
which are integrated into polycentric urban
forms (Phelps 2004). ‘It derives from the ten-
sion between forces of agglomeration, on the
one hand, and those of decentralisation on the
other hand’ (Phelps 2004, p. 981).
Currently, there is a variety of papers
(Burger et al. 2015; Malý 2016; Meijers
& Burger 2017) dealing with the question
why some smaller cities in proximity to larger
cities have special prerequisites for relatively
high economic and population growth. Here,
the borrowed size concept is used to explain
the need for geographical proximity and
functional connectivity to foster economic
advantages and a thriving regional economy
(Burger et al. 2015). In general, results indi-
cate that a place borrows size when it hosts
more metropolitan functions than its own size
could normally support.
Locations in proximity to a larger centre
within an urban region can also be related to
negative borrowing size effects, the so called
‘agglomeration shadow’ effects. This term is
applied in new economic geography (Krugman
1991), which states that ‘growth near concen-
trations of firms will be limited by competition
effects. Positioning within the “shadow” is not
profitable for firms’ (Meijers & Burger 2017,
p. 274). That entails a low-risk for agglomera-
tion shadow effects in isolated cities compared
KATI VOLGMANN AND KARSTEN RUSCHE62
© 2019 Royal Dutch Geographical Society KNAG
to cities that are nearby large cities. This is in
line with the ideas from central place theory
(Christaller 1980) and urban systems theory
(Berry 1964), where smaller cities have fewer
central place functions or consumer amenities
than isolated cities of similar size (Burger et
al. 2015; Cardoso & Meijers 2016). In addition,
there are also major overlaps to the regional
concept of spread and backwash effects, con-
ceptualised by Myrdal (1957). It was used to
investigate and understand the relationship of
growth and decline between urban and rural
areas (Henry et al. 1997). Spread effects occur
from a centre to its hinterland, causing eco-
nomic and population growth. This is in line
with the concept of borrowed size effects for
cities nearby large cities in which a city profits
from urban functions (e.g. infrastructure, pub-
lic services) or in economic performance in
terms of population and employment growth
(Veneri & Ruiz 2016). Backwash effects can be
described as a process in which the hinterland
allocates resources to centres. These negative
effects are very similar to the agglomeration
shadow effect.
Studies and operationalisation of borrowing
size, function and performance – Theoretical
and empirical studies build upon and enrich
the concept of borrowed size (Polese &
Shearmur 2006; Camagni & Capello 2015).
They are discordant regarding where, in
which regions, and in which cities borrowing
size effects occur. Brezzi and Veneri (2015)
note that cities near large agglomerations
seem to have no significant effect on regional
performance (GDP per capita) in multi or
polycentric areas, and, even if cities are about
the same size, the regional performance
is negative. This evidence corresponds to
outcomes in north-west Europe (Burger
et al. 2015) and the Netherlands (Meijers
2008), in which larger cities with high-order
functions spread a shadow over the smaller
surrounding centres. This results in places
that are in the shadow of larger cities that
possess fewer functions than one would
expect from their size.
Other empirical studies provide an indica-
tion of borrowed size effects; smaller cities in
large urban regions show positive employment
(Polese & Shearmur 2006) and population
(Partridge et al. 2007) growth rates. The
magnitude of effects depends on the utilisa-
tion of high-order urban functions and net-
works such as urban infrastructure, density
to external linkages, mobility factors and ed-
ucation (Polese & Shearmur 2006; Camagni
et al. 2015). Veneri and Ruiz (2016) confirm
that population growth depends on the sig-
nificance of the proximity to the closest main
centres – increasing the distance from a large
centre increases transportation costs and re-
duces population growth, benefits and the use
of technology. Some cities, primarily those in
long distance to urban centres or those that
are small in terms of economic size or old in
demographic structure, are not able to benefit
from growth effects and are affected by back-
wash effects/agglomeration shadow effects
(Partridge et al. 2007).
Differences between classes of urban re-
gions cannot be explained by merely con-
sidering agglomeration economies and
diseconomies. The benefits of spatially
clustered cities are related to their position
relative to another city, so borrowing size is
linked to the interactions that generate ag-
glomeration economies (Polese & Shearmur
2006). Travelling distance (km or time) is
one indicator for access to agglomeration
externalities. Partridge et al. (2007) consti-
tutes that, with every kilometre increase in
distance from the small city to the large one,
cities experience less population growth. A
travel time of one hour allows firms located
in smaller cities to access specialised labour
market and informational external econ-
omies (Phelps et al. 2001). The travel time
for accessibility or connectivity is not the
only crucial factor that generates spatial ef-
fects for the urban hinterland. According to
Hesse (2016), the co-operative relationships
and exchange of information are important
in addition to the physical distance. Cities
embedded in specific national or interna-
tional networks can benefit from borrowed
size effects – ‘borrowed size is less a product
of distance or access than it is of true interac-
tion’ (Meijers & Burger 2017, p. 288). Hence,
smaller cities can substitute their lack of
urban mass or city size by being integrated in
THE GEOGRAPHY OF BORROWING SIZE 63
© 2019 Royal Dutch Geographical Society KNAG
a (inter)national network (Meijers et al. 2016).
Larger cities with a certain size and presence
of metropolitan functions play a crucial role
for urbanisation economies because they
have access to a larger (inter) national mar-
ket than smaller cities. Burger et al. (2015)
note that size is the most important factor ex-
plaining the presence of high-order or met-
ropolitan functions because a critical mass is
crucial and necessary for the existence and
gathering of such urban amenities.
High-order or metropolitan functions are
‘characterised by higher thresholds for the
level of appearance in the city (in terms of
urban population)’ (Capello & Camagni 2000,
p. 1483) and are sometimes used in terms of
high-level occupations, particularly gaining a
high percentage of the financial and corpo-
rate service sub-sectors (Camagni et al. 2016;
Hesse 2016) or service sector employment and
office and retail floor space (Phelps 1998).
Another approach in this regard addresses
functional characteristics and indicators that
can be constructed in functional urban re-
gions (BBSR 2011). This method is used to
identify and select high-level functions of cit-
ies using concepts and classifications covering
wide-ranging: (i) decision-making and control
functions by public and private sectors; (ii)
innovation and competition functions; (iii)
gateway functions; and (iv) symbolic func-
tions (Behrendt & Kruse 2001; Blotevogel
& Danielzyk 2009). These functions can be
viewed as an expression of geographical power
and relate to the hierarchical understanding
of urban regions as part of a central place sys-
tem (Meijers 2007).
That leads to the conclusion that borrowing
size effects are stronger where physical prox-
imity and accessibility to large cities can be
exploited, which underlines the argument for
better performance of cities in more polycen-
tric urban regions due to interactions among
actors sharing agglomeration externalities.
However, analysis of spatial and functional dif-
ferentiations within urban systems are scarce
in terms of their view on urban functions and
urban growth interdependencies (Cardoso
& Meijers 2016).
Redefining ‘borrowed size’ – Recent studies
by Meijers and Burger (2017) and Meijers et
al. (2016) redefined and stretched the concept
of borrowed size along several dimensions
in terms of scale and scope. The authors
propose a distinction between two dimensions
of borrowing size, namely, ‘borrowed
performance’ and ‘borrowed functions’ (see
Figure 1). Borrowed performance is defined by
performance that is better than expected given
Source : Meijers and Burger (2017).
Figure 1. Dimensions of borrowed size . [Colour figure can be
viewed at wileyonlinelibrary.com]
www.wileyonlinelibrary.com
KATI VOLGMANN AND KARSTEN RUSCHE64
© 2019 Royal Dutch Geographical Society KNAG
the size and refers to advantages derived from
a pooled and diversified labour market and
population spill-overs. Borrowed functions are
defined as more functions than expected given
the size and can be linked to accumulations of
high-order/metropolitan functions, such as
artefacts, activities, amenities. If both processes
occur simultaneously, the authors define it
as the ‘borrowing size’ dimension (Meijers
& Burger 2017).
The question of agglomeration econo-
mies of immobile high-order functions such
as universities, airports or infrastructure in
urban centres is closely correlated to the spa-
tial distribution of borrowed size effects. With
access to functions of large cities through con-
nectivity (true interaction), smaller cities in
the surrounding area can borrow central or
metropolitan functions from the city, which
may manifest in higher population growth or
higher incomes but can unfortunately prevent
surrounding cities from having the ability to
perform important functions themselves:
Whereas growth potentials in terms of
urban functions are limited in the sur-
rounding areas of large dominant cities,
this does not necessarily mean that popu-
lation growth is equally restricted (Cardoso
& Meijers 2016, p. 1002).
Meijers and Burger (2017) conclude that
smaller cities support larger cities to maintain
more metropolitan functions, so the borrow-
ing function occurs more frequently within
larger cities, while smaller cities are typically
the borrowing performance type. Larger cities
are likely to cast a functional agglomeration
shadow over the entire urban region by con-
centrating many metropolitan functions in its
core.
Research gap – In this contribution, we
investigate the possibilities to operationalise
the (stretched) concept of borrowed size. We
investigate three research questions that are
directly derived from the current state of the
art in borrowed size research:
(1) How can borrowed size categories be mea-
sured statistically?
The first objective is to analytically
explore and operationalise the concept of
the borrowed size. We adopt the redefined
concept with its four-dimensions (Meijers &
Burger 2017) and explore the relation among
borrowed size, performance, function and ag-
glomeration shadows. Therefore, it is neces-
sary to translate the theoretical and analytical
matrix into measurable indicators to catego-
rise cities within the German urban regions in
terms of their borrowed size dimension.
(2) To what extent are cities in German urban
regions affected by spatial effects of bor-
rowed size?
We assume that smaller cities in urban re-
gions are affected by borrowed size effects
and expect regions that are affiliated with a
polycentric urban region enjoy borrowed per-
formance or borrowed function effects. More
central cities that are predominant to their
surroundings should be characterised by bor-
rowed size effects and cast an agglomeration
shadow on their functional hinterland. The
investigation of these spatial distributions is ap-
plied on a small scale and integrates all large,
medium and small municipalities in German
urban regions to determine which cities are af-
fected by various borrowed size effects.
(3) Do city size and the spatial structure have
different effects on borrowing function and
borrowing performance?
Due to the different spatial structure of
German urban regions, we expect different
effects along the four-dimensions of borrowed
size. We want to find out whether these ef-
fects in large cities behave differently vis-à-vis
smaller and medium cities.
RESEARCH DESIGN
Study region – Our spatial reference in this
paper is the German urban system. Unlike the
French or English urban systems, the German
urban system does not contain a large primate
city. Instead, it has a polycentric structure
of 10–12 leading core cities with significant
economic, political and cultural functions
(Blotevogel 2000), which makes it a particular-
ly interesting example to study borrowed size
effects. Due to Germany’s polycentric struc-
ture and its historical development – espe-
THE GEOGRAPHY OF BORROWING SIZE 65
© 2019 Royal Dutch Geographical Society KNAG
cially since reunification – the German urban
system constitutes an interesting case study be-
cause, within the urban system, there is a wide
range of urban regions with different struc-
tural and functional conditions. The origin of
this structure dates back to the Middle Ages
and continues to be reflected in the federal
structure of Germany’s political and admin-
istrative system (Blotevogel & Hommel 1980).
The division of the urban structure was a re-
sult of the Second World War and its political
aftermath; political-administrative and busi-
ness functions were removed from West Berlin
and relocated to a number of major regional
centres in West Germany. As a consequence,
West Germany’s urban system developed a
complex polycentric structure (Krätke 2002).
In contrast, East Germany continued to be
dominated by (East) Berlin, thereby acquiring
a monocentric structure (Prigge & Schwarzer
2006). Since reunification in 1990, the system
has undergone several dynamic changes. Ber-
lin’s status as capital city in 1999 and the fol-
lowing relocation of the government led to a
repositioning of German cities, however Ber-
lin is not comparable to Paris or London.
We use a specific functional delineation
of urban regions (Siedentop & Kaup 2017).
The spatial references are the German mu-
nicipalities, so the analysis is done on a small
scale. In the first step, we define core cities
with at least 200,000 inhabitants and 100,000
employees/jobs (within social insurance). In
accordance with these criteria, we identified
32 core cities in the German urban system.
Within this group of cities, there are five
major large cities with more than 600,000
inhabitants: Berlin, Munich, Hamburg,
Frankfurt and Cologne. The remaining 27
core cities are defined as medium cities. It is
assumed that each of these core cities plays an
important functional role for its urban hin-
terland, providing higher-level central places
such as economic hubs and employment
centres. The functional hinterland of the 32
core cities is calculated by a network analysis,
routing from the core city to each municipal-
ity focal point (in the hinterland) with a de-
fined threshold for real car travel times. The
commuting area of a core city was based on
a gravitation-curve derived from the number
of employees. The core city with the highest
employment centralisation had a 60-minute
commuting buffer (Berlin), while the lowest
was 30 minutes (Erfurt) (see Figure 2). This
delineation leads to overlapping urban re-
gions, for example, in Duisburg, Essen and
Dortmund. Thus, we use a disjunct delinea-
tion of urban regions that sorts the munic-
ipalities to their individual nearest core (in
travel time). This resulted in a group of 20
urban regions, which can be differentiated
into monocentric (with one core city) and
polycentric (at least two core cities located
in the functional urban region) urban re-
gions with one or more core cities that are
non-overlapping areas. In extension, all mu-
nicipalities that show metropolitan functions
(according to our indicator) and are neither
large in type nor classified as a city regional
core, are classified as small cities.
Operationalisation of the stretched concept
of borrowed size – As discussed in the
introduction of the concept, there is a
need to define performance as well as
metropolitan function variables. In addition,
the conceptualisation of the four-field
classification relies heavily on the idea that
regions perform better or have more functions
than you would expect given their size. To
enable classification of regions, there is a need
for readily definable variables and a concept
for defining whether regions do better in
a specific variable than one would expect
from their size. In the following two sections,
we introduce one variable for metropolitan
functions and another as a measure for
regional performance. In the next section,
we discuss how expectations are incorporated
into the concept and how we applied it to our
sample.
Metropolitan functions – The operation-
alisation of borrowed functions involves
the question of how to enumerate the
metropolitan characteristics of a large city
to compare them with other cities. A set of
indicators was designed to operationalise
and quantify metropolitanity. The selection
of suitable indicators is determined by
whether the pointers reflect metropolitan
KATI VOLGMANN AND KARSTEN RUSCHE66
© 2019 Royal Dutch Geographical Society KNAG
Source : data from The Regional Database Germany.
Cartography: Jutta Rönsch.
Figure 2. German urban regions . [Colour figure can be viewed
at wileyonlinelibrary.com]
www.wileyonlinelibrary.com
THE GEOGRAPHY OF BORROWING SIZE 67
© 2019 Royal Dutch Geographical Society KNAG
characteristics, namely, whether they conjure
up a metropolitan flair or importance
(Krätke 2003). Characteristics that purely
refer to a city’s structure or trivial size effects
such as population or population density are
not sufficient indicators. The presence of
high-level functions is frequently connected
to urban size, but not always. For example,
a city such as Zurich, with only 350,000
inhabitants, is specialised in international
finance like New York and Tokyo (Capello
1998). Furthermore, the choice of an
appropriate indicator depends on a
comprehensive data structure for the study
region (counties and cities in Germany), the
comparability of data sources among time
periods and objective and reliable statistics
(Volgmann 2014; Growe & Volgmann
2016). Our dataset consists of 47 localised
functional attribute indicators for 2008–
2010 (see Volgmann 2014; and Table 1). To
simultaneously detect and compare a number
of metropolitan facets, the raw data were
z-standardised and a metropolitan index for
all 47 indicators was constructed from the
various indicators (a static indicator) using
additive linking. Due to the analysis on the
municipality level, the metropolitan index
of the counties was transferred to the largest
municipality belonging to a county. Each
urban municipality has its own index.
Urban performance – Although a variety
of papers describes concepts for measuring
metropolitan functions, there is a lack of
empirical answers to the question of how
to measure urban performance. In their
paper on stretching the concept of borrowed
size, Meijers and Burger (2017) describe the
general dimensions of performance but do
not operationalise the idea in detail. We
pair urban performance with metropolitan
functions by focusing on a readily available
basic economic variable of municipalities:
the number of jobs (within social insurance),
which is accessible via public regional data
sources (regionalstatistik.de). In doing so, we
narrow the view on performance to a purely
economic point of view, which may not be
optimal. For instance, other authors discuss
adding information on demographic or
income indicators, for example Cardoso and
Meijers (2016). Due to a lack of income data
on such a local scale and the intended focus
on the demand for labour, we suggest using
employment data, as it is available on small
scales as well as for long time horizons.
In addition to the general choice of data to
measure performance, it is important to dis-
cuss the indicator used to measure the rela-
tive performance (a dynamic indicator) of the
urban regions. In our view, it is misleading to
focus on the absolute change in employment
or the pure percentage change in employ-
ment in this case. In this research, ‘perfor-
mance’ and the shift or relative importance
of cities are of utmost importance. When
examining absolute changes in employment,
cities with an already large employment base
tend to have above-average changes between
years. Additionally, when examining relative
changes, small absolute changes in cities with
a small employment base may have relatively
high percentage changes. Therefore, our
analysis uses the employment shares of cit-
ies, which is often used when comparing the
economic performance of cities (Dijkstra et
al. 2013).
Following this logic, we calculate the em-
ployment share of each city with a metropol-
itan function out of the sum of employment
of these cities. We use a subset of 60 munic-
ipalities in this case. Then, we compute the
changes in those shares between 2008 and
2015. We consider cities that are able to in-
crease their share as performing relatively
well. Cities that lose relative importance per-
form relatively poorly.
Expectations ‘given size’ – The final step in
operationalising the concept of borrowed size
is to define how it can empirically be employed
to measure the expected performance and
functions. This enables us to assign regions
along the dimensional scope of the concept.
Meijers and Burger (2017) suggest using a
parsimonious regression approach for met-
ropolitan function endowment for regions.
In their approach, they regressed size on an
index of metropolitan functions and used the
residuals of that regression to identify how
many metropolitan functions a region has. In
this empirical logic, a region with a positive
residual can be classified as providing more
KATI VOLGMANN AND KARSTEN RUSCHE68
© 2019 Royal Dutch Geographical Society KNAG
metropolitan functions than could be expected
using the size as an indicator and vice versa.
In our approach, we also use this general
logic of regression residuals as an indicator
for more or less endowment ‘given the size’.
Importantly, we extend this logic in two as-
pects. We introduce our performance mea-
sure as the second pillar to address the full
scope of borrowed size dimensions. We use the
residuals of two regressions, which are con-
structed following general recommendations
in economic geography literature (Combes
& Gobillon 2015). Researchers suggest using
information on employment or population
to measure the size of a local economy. They
strongly advise using information on density
when analysing regional entities (Ciccone &
Hall 1996). Accordingly, we use parsimoni-
ous regressions, as suggested by Meijers and
Burger (2017), and add density as an explan-
atory variable, which is the second conceptual
amendment:
Table 1. Forty seven localised functional attribute indicators.
Control function Innovation function Gateway function
Symbolic function
Business and finance
Research/development in
the private sector Transportation Media and cultural economy
headcount of the 500
largest companies
- turnover of the 500
largest companies
- total assets of the 50
largest banks
- gross income of the
30 largest insurance
companies
- stock exchange
locations
- turnover of the top 30
retail food companies
- locations of the 100
most innovative
companies in Germany
- number of engineers
employed
- employees working in
business-oriented
services
- employees with an
academic degree
- patents filed by
companies
- flight activity at
international
airports
- passenger volumes
at international
airports
- ICE/TGV stations
- locations of private and
public broadcasting
companies
- film studios
- the 100 largest book
publishers
- national newspaper
publishers
- Internet domains
- employees working in
cultural occupations
Policy Science and research Market volume
Arts, culture and
architecture
- locations of federal
ministries
- number of employees
working for the
Federal State and the
Länder
- locations of courts
- EU/UN institutions
- embassies and
consulates
- associations
- development
organisations
- foundations
- locations of DFG
special research areas
- research locations
belonging to the
Helmholtz
Community
- locations of Max-
Planck, Fraunhofer,
Leibniz, Academies
and Leopoldina
- university locations
- media units in
science-oriented
general and university
libraries
- patents filed by
research institutes
- employees working in
research
- transhipment
volumes in seaports
- transhipment
volumes in inland
ports
- turnover of the top
100 logistic compa-
nies (in € million)
- air freight volumes
at airports
- trade fair/exhibition
locations –
exhibition floorspace
(> 100,000 sqm)
- locations of buildings by
famous architects
- locations of Germany’s 25
highest buildings
- location of major urban
development competitions
- opera audiences
- theatre audiences
- concert audiences
- capacities of the 20 largest
football stadia
- hotel guests
Source : Volgmann (2014).
THE GEOGRAPHY OF BORROWING SIZE 69
© 2019 Royal Dutch Geographical Society KNAG
where MF is the metropolitan index, POP
population, and POP.DENSITY is the pop-
ulation divided by the settlement area. All
values are from 2008. We opted for the use
of static indicators because the metropolitan
functions do not notably differ between 2008
and 2015. In contrast, in the second regres-
sion, the change of the employment share of
a municipality between 2008 and 2015 (EMP.
SHARE) is explained by the stock of employ-
ment in 2008 (EMP) and the employers per
settlement area in 2008 (EMP.DENSITY). In
the second case, we want to explain a change
in employment share to reflect the concept
of relative urban performance.
As shown in Table 2, we used the residuals
of both OLS regressions to classify the 60 mu-
nicipalities with metropolitan functions along
the four dimensions of borrowed size. For the
metropolitan index, we obtained similar ex-
planatory power (adj. R2 = 0.86) as the OLS
models reported in Meijers and Burger (2017),
whereas the employment share calculations
performed worse but were still acceptable,
with an adjusted R2 of 0.51.
ANALYSIS AND EMPIRICAL FINDINGS
This section presents a comprehensive picture
of the spatial distribution of metropolitan
functions and the economic performance in
the cities of German urban regions. The spa-
tial distribution of the overall metropolitan
index in 2008–2010 is shown in Figure 3 for
60 municipalities in German urban regions
(above average value). This reveals a hierar-
chical system dominated by – roughly – five
core cities, with Berlin (414.76) and Munich
(260.54) outperforming other German cit-
ies, emphasising their dominant function.
Together with Hamburg (221.80), Frankfurt
(206.12) and Cologne (141.03), they are the
leading cities in the German urban system.
This corresponds to the theory-based assump-
tion of understanding metropolitan functions
in the sense of central place theory. The gains
of Berlin trace back to the relocation of the
government to Berlin. Members of Parliament
and their offices, embassies, representative
offices of the federal states, political parties,
associations, foundations, interest groups and
media representations moved to Berlin. The
capital of Berlin thus benefited from the relo-
cation of public and cultural institutions and
from funding and infrastructure investments
and became an attractive destination for vis-
itors and tourists. Together with the medium
sized cities these five large cities build the cen-
tral cores of the urban regions of the following
analysis, where borrowed effects are investi-
gated. Because of the polycentric structure in
the German urban system, we expect different
spatial interdependencies – some nearby cit-
ies may benefit from borrowed function and
borrowed performance but some cities may be
affected by agglomeration shadows.
Figure 4 depicts the changes in employ-
ment shares, which is, in our definition, the
‘performance’ of regions for all municipali-
ties in the functional urban regions analysed.
The 60 cities with a metropolitan index value
are highlighted. Notably, the large cities in the
German urban system are also those that per-
form quite well in relation to other municipal-
ities. Berlin, Munich, Hamburg and Cologne
led in increasing their share in employment
from 2008 to 2015. Interestingly, Leipzig,
a medium city, is one of the more thriving
(1)MF = POP + POP.DENSITY,
(2)EMP.SHARE = EMP + EMP.DENSITY,
Table 2. Operationalisation of the four dimensions of borrowing
size.
Regression on metropolitan index
Negative residuals Positive residuals
Regression on shift in
employment share
Negative residuals Agglomeration Shadow Borrowed Functions
(20 municipalities) (7 municipalities)
Positive residuals Borrowed Performance Borrowed Size
(16 municipalities) (17 municipalities)
Source : own illustration based on Meijers and Burger (2017).
KATI VOLGMANN AND KARSTEN RUSCHE70
© 2019 Royal Dutch Geographical Society KNAG
Source : own calculations. Cartography: Jutta Rönsch.
Figure 3. Metropolitan index in cities of German urban regions
(2008–2010) . [Colour figure can be viewed at
wileyonlinelibrary.com]
www.wileyonlinelibrary.com
THE GEOGRAPHY OF BORROWING SIZE 71
© 2019 Royal Dutch Geographical Society KNAG
Source : data from The Regional Database Germany.
Cartography: Jutta Rönsch.
Figure 4. Employment growth in the cities of German urban
regions (changes of employment shares 2008–2015) .
[Colour figure can be viewed at wileyonlinelibrary.com]
www.wileyonlinelibrary.com
KATI VOLGMANN AND KARSTEN RUSCHE72
© 2019 Royal Dutch Geographical Society KNAG
cities in Germany. Despite this major devel-
opment, there is no clear dominant growth in
employment shares in specific urban regions.
All functional urban regions host a mix of rel-
atively low and high-performing hinterlands.
For the more monocentric, high-performing
regions, the picture is dominated by relatively
well-performing regions. In addition to this
general impression of changes in employment
shares, our approach also shows the degree
of functional or performance expectations
derived from the regression residuals. Using
the information gathered in the two regres-
sions, we built the four-group classification
listed in Table 2. We assigned a specific type
of borrowed size to all cities with metropoli-
tan functions.
The scatterplot in Figure 5 depicts the re-
siduals of both regressions for the 60 munici-
palities in our study. Divided by the zero values
of both axes and the three city-types large,
medium and small city, the four dimensions
of the borrowed size concept can be differen-
tiated. Most of the data pairs of residuals are
scattered around the central of the axis, show-
ing that there are detectable deviations from
the expected values and that the data are not
heavily influenced by outliers, which is an-
other argument for the goodness of fit of our
empirical approach. Only two data points are
at the far ends of the scatterplot. One is Berlin,
which performed much better than predicted
while having slightly fewer metropolitan func-
tions (why it is classified as ‘borrowing perfor-
mance’). The other is the city of Frankfurt am
main, which performed slightly worse than
expected but hosts many more metropolitan
functions given its size (why it is classified as
‘borrowing function’).
To extend the distribution of regression re-
siduals, the classification results can be used
to map the results for additional conclusions.
Figure 6 and Table 3 show the borrowed size
types of our sample of 60 municipalities.
Source : own calculations and illustration.
Figure 5. Scatterplot of regression residuals . [Colour figure
can be viewed at wileyonlinelibrary.com]
www.wileyonlinelibrary.com
THE GEOGRAPHY OF BORROWING SIZE 73
© 2019 Royal Dutch Geographical Society KNAG
Source : own calculations. Cartography: Jutta Rönsch.
Figure 6. Effects of borrowing size in German urban regions .
[Colour figure can be viewed at wileyonlinelibrary.com]
www.wileyonlinelibrary.com
KATI VOLGMANN AND KARSTEN RUSCHE74
© 2019 Royal Dutch Geographical Society KNAG
Mapping the spatial distribution of the types
and the relation with other cities that belong
to a common functional urban region pro-
vides further insight into the (functional) re-
lationship among larger, medium and small
cities in their specific regional contexts.
The large cities of Berlin, Munich, Hamburg,
Cologne and Frankfurt act as the leading cen-
tres of growth in the German urban system,
showcasing a diverging picture in their individ-
ual borrowed size classification. Munich is the
only city with above-average values in terms of
metropolitanity and performance and there-
fore its development may be attributed to bor-
rowing size from its hinterland. In addition,
we find the dimension of borrowed size in 16
small cities (see Table 3) surrounding large
cities such as Munich, Frankfurt am main,
Cologne and Berlin. This indicates that small
cities nearby larger agglomerations are success-
ful in profiting from economic performance
and functions due to their city-regional loca-
tion. Thus these results correspond to Meijers
and Burger (2017) assumption, that these pro-
cesses occur more often in polycentric regions
with equally sized neighbouring cities but is not
reserved to small cities – in this case Munich.
Meijers and Burger (2017) assume that bor-
rowing functions preferentially occur more
often in large cities. This can be seen in seven
cases: Hamburg, Cologne and Frankfurt am
main, but also for the medium core cities
Hanover, Dusseldorf, Bonn and Stuttgart.
Berlin is the only large city with borrowing per-
formance effects. All other large cities have a
greater degree of metropolitanity than would
be expected given their size. Therefore, large
cities occupy an important position in the
German urban system, supported by individ-
ual, nearby medium and small cities within a
city-regional network. Some small and medium
cities (Esslingen, Ludwigsburg, Waiblingen
near Stuttgart and Darmstadt, Mainz, Bad
Homburg near Frankfurt am main and Neuss
near Dusseldorf) in the surrounding area ben-
efit from employment effects but do not ful-
fil any important metropolitan functions. As
part of a polycentric urban region, they have
access to the metropolitan functions of the
neighbouring large city and agglomeration ad-
vantages (e.g. high-order services, institutions,
and infrastructure such as research labs, edu-
cational institutions, and airports), resulting
in positive structural effects. Other small cit-
ies in close proximity to large growing cities
benefit from spatial proximity and connectiv-
ity to functions, thereby enriching themselves
functionally and structurally (borrowed-sized
effects). These regions are complemented by
solitary urban regions Augsburg, Freiburg,
Erfurt and Muenster. The coexistence of large,
medium and small cities and the diverse spa-
tial structure in urban regions is a key charac-
teristic in the German urban system.
In contrast to the positive feedback and
spillover effects 20 cities are characterised
by negative effects from being located in
close proximity to larger cities. They perform
worse than expected and have fewer metro-
politan functions given their size: they are
affected by agglomeration shadow. These ef-
fects occur in two city-regional settings: in the
structurally weak Ruhr area and Bergisches
Land (Dortmund, Essen, Duisburg, Bochum,
Wuppertal, Monchengladbach) in the polycen-
tric Rhine-Ruhr urban region and in less-cen-
tral monocentric urban regions defined by
medium cores Dresden, Aachen, Bremen,
Bielefeld, Magdeburg as well as the slightly
polycentric urban regions Erfurt, Nuremberg.
In the first case, the large centres
Dusseldorf, Cologne and Bonn cast an
Table 3. Distribution of borrowed size types by city type.
Borrowed size type Large city Medium city Small city Total
Agglomeration shadow - 15 5 20
Borrowed function 3 4 - 7
Borrowed performance 1 7 8 16
Borrowed size 1 - 16 17
total 5 26 29 60
Source : own calculations and illustration.
THE GEOGRAPHY OF BORROWING SIZE 75
© 2019 Royal Dutch Geographical Society KNAG
agglomeration shadow over the Ruhr cities.
In the second case, this cannot explain the
classification of the more solitary urban re-
gions. Size and influence of smaller German
urban regions appear to be too small, as they
are able to absorb a minimum level of met-
ropolitan functions. This idea of a minimum
threshold of ‘urbanity’ can be transferred to
the whole urban system when examining the
spatial distribution of borrowed size effects.
Dominating urban regions such as Berlin,
Munich or Hamburg cast an agglomeration
shadow over the whole urban system in the
sense of defining a minimum level of relative
metropolitanity and economic performance
for other urban region cores. If small and me-
dium cities are more isolated in terms of the
distance to major urban regions or the lack of
supporting cities in their functional regions, it
is more likely that this region will not be able
to keep up with the performance of the whole
urban system.
Also, the German urban system allows for
an analysis of different types of urban regions
- monocentric or polycentric urban regions.
Monocentric regions are regions with only
one core city and polycentric urban regions
are regions with more than two core cities
(Table 4). Cities in large polycentric urban
regions tend to be of the type ‘borrowing
functions’. So, these types of regions are able
to transfer functional advantages to the en-
tire urban region. By contrast, rather small
monocentric urban regions without a major
city in terms or population size do not gen-
erate any borrowed size effects. Importantly,
larger monocentric regions are more effective
in terms of borrowing performance, which is
linked to the classical understanding of ag-
glomeration economies.
Table 4. Distribution of borrowed size types by spatial structure
of the urban region.
City-region
Agglomeration
shadow
Borrowed
function
Borrowed
performance
Borrowed
size Total
Monocentric
urban
regions
Aachen 1 1 2
Augsburg 1 1
Bielefeld 1 1
Bremen 1 1
Dresden 1 1
Freiburg 1 1 2
Kiel 1 1
Leipzig 1 1
Magdeburg 1 1
Muenster 1 1
Chemnitz
Monocentric
urban regions
5 - 5 2 12
Polycentric
urban
regions
Berlin 1 1 2
Erfurt 2 2
Hamburg 1 1 2
Hannover 1 1 1 3
Munich 4 4
Nuremberg 1 1
Rhine-Ruhr 8 3 2 3 16
RhineMain/
RhineNeckar
/Karlsruhe
3 1 4 4 12
Stuttgart 1 3 2 6
Polycentric urban
regions
15 7 11 15 48
Source : own calculations and illustration.
KATI VOLGMANN AND KARSTEN RUSCHE76
© 2019 Royal Dutch Geographical Society KNAG
CONCLUSION
Using German urban regions as an example,
our paper contributes to the discussion on
borrowing size effects. According to this con-
cept, smaller cities that are part of larger func-
tional urban regions can utilise high-order
urban functions and economic dependencies,
thereby boosting their regional performance.
This is conceptualised in the four-dimension
concept of Meijers and Burger (2017), which
we further operationalised and assessed in
terms of performance and function (see third
section). We employed our empirical approach
to classify cities along the four dimensions of
the borrowed size concept to describe and eval-
uate the spatial distribution of borrowed size
effects in the German urban system (see fourth
section).
The German urban regions offer the op-
portunity to test the variety of the geography
of borrowing size on local scale. Concerning
the interpretation and understanding of our
results, we state that urban regions are cen-
tral and important driving forces in regional
economics (Scott et al . 2001). The interrela-
tions between large cities as international
nodes and inner-city as well as suburban func-
tional differentiations form an integrated sys-
tem of spatial division of labour (Kloosterman
& Musterd 2001; Parr 2014). In its geograph-
ical scope, the expansion and direction of
regional urban development unfolds increas-
ingly heterogeneous (Dijkstra et al. 2013). As
we show in this paper, functional and eco-
nomic growth is not solely concentrated on
major cities. But the size of a city seems to be
one central factor explaining the presence
of metropolitan functions. Nevertheless, this
general tendency needs to be confronted with
the specific city regional contexts like the spa-
tial structure. Whether a city is relatively small
or large or is located in a monocentric or poly-
centric urban region has a significant impact
on the four occurring borrowed size effects.
We provide evidence for economic and
functional interrelations linked to large cities
and their hinterland, which have been charac-
terized as ‘interplaces’ by Phelps (2017). His
argumentation is based on the fact that the
contemporary economy is not purely divided
into agglomerations (place) and networks
(space) but consists also of enclaves of export
processing zones and arenas of trade fairs –
which are labelled interplaces. Other con-
cepts about polycentrism (Burger & Meijers
2012; van Meeteren et al. 2016; Rauhut 2017),
Edge Cities (Garreau 1992) or New economic
sub-centres (Krehl 2015; Kane et al. 2018) see
urban regions as economic and social entities
in which processes of concentration and de-
concentration take place.
Those processes of concentration and de-
concentration depend on internal and exter-
nal agglomeration economies, which occur
within functional urban regions and differ
in size and functional structure – which we
described with the four dimensions of the
borrowed size concept. This interpretation is
linked to the theoretical argumentation that
agglomeration economies are not limited to
the physical boundaries of a city. Moreover,
they spill over to surrounding areas or cities
(Parr 2002). This understanding is thereby
enriched by the concept of borrowed size, in
which the role of urban benefits is an essential
explanatory variable for urban development
(Burger et al. 2015; Hesse 2016; Malý 2016;
Meijers & Burger 2017). To support regional
development, agglomeration economies can
be linked to the regional spatial and func-
tional structure: improvements in regional
transport and information and communica-
tion technologies support borrowing size in
urban regions (Brezzi & Veneri 2015).
Our approach can be viewed as a starting
point for further research employing the op-
erationalised concept of borrowed size. Future
research could focus on a differentiation of the
metropolitan index on a much broader variety
of urban functions to exploit the richness of the
data and gather more detailed information on
the typical functions for each borrowed func-
tion dimension, how this is linked to spatial
co-agglomeration and if change interdependen-
cies occur over time. It could be possible, that
the distribution and specialisation of several
metropolitan functions between cities in urban
regions gives an indication of which metropoli-
tan functions can be borrowed from surround-
ing smaller and medium cities.
In addition to developing the conceptual
approach with other variables there is a need
for a deeper understanding of the driving
THE GEOGRAPHY OF BORROWING SIZE 77
© 2019 Royal Dutch Geographical Society KNAG
forces of the spatial distribution of the borrow-
ing size dimensions. This would explain the
influencing factors for the ability of some cit-
ies to lend and use the critical mass or city size
close to the large cities. Empirical indicators
that would help explaining this relation are in-
come indicators, transport connections and ac-
cessibility (see also Agnoletti et al. 2015) as well
as the commuter flows within urban regions.
For regional policies and policy measures, it is
important to be able to identify and classify the
phase and spatial shape of regional develop-
ments to adapt the right kind of urban policy
(Dijkstra et al. 2013). In the future, small and
medium cities in the surrounding should play
a specific role for urban re-development and
planning policies (Hesse & Siedentop 2018).
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© 2019 Royal Dutch Geographical Society KNAG
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Zwischen Hierarchie, Wettbewerb und Kooperation,
Stadtforschung Aktuell; 105. Wiesbaden: VS Verlag
für Sozialwissenschaften.
Rauhut, D. (2017), Polycentricity – One Concept or
Many? European Planning Studies 25, pp. 332–348.
7.
Sassen, S. (1991), The Global City: New York, London,
Tokyo. Princeton, NJ: Princeton University Press.
Scott, A. J., J. Agnew, E. W. Soja & M. Storper
(2001), Global City-Regions. In : A. J. Scott (Hg.),
eds., Global city-regions. trends, theory, policy. 1.
publ., pp. S. 11–30. Oxford: Oxford University
Press.
Siedentop, S. & S. Kaup (2017), Monitoring
Stadtregion: Trends der Flächennutzung im
stadtregionalen Kontext. In : G. Meinel, U.
Schumacher, S. Schwarz, & B. Richter, eds., IÖR
Schriften: Band 73. Flächennutzungsmonitoring IX:
Nachhaltigkeit der Siedlungs- und Verkehrsentwicklung? :
9. Dresdner Flächennutzungssymposium (DFNS)
am 3. und 4. Mai 2017 (pp. 3–10), Berlin:
Rhombos-Verlag.
van Meeteren, M., A. Poorthuis, B. Derudder
& F. Witlox (2016), Pacifying Babel’s Tower: A
Scientometric Analysis of Polycentricity in Urban
Research. Urban Studies 53, pp. 1278–1298.
Veneri, P. & V. Ruiz (2016), Urban-to-rural
Population Growth Linkages: Evidence from
OECD TL3 Regions. Journal of Regional Science 56,
pp. 3–24.
Volgmann, K. (2014), Entwicklung Metropolitaner
Funktionen im Polyzentralen Deutschen
Städtesystem: Raummuster der Konzentration
und Funktionalen Spezialisierung. Raumforschung
Und Raumordnung 72, pp. 21–37.
The Analysis Paper:
For the paper, you will need to follow the format given below in
analyzing and summarizing the components of the research
article about which you are writing. Remember that you are
only using ONE article in the part of the project. In completing
the following format, you will need to read each section of the
article you are using very carefully, possibly more than once.
Your paper should be at-least 6 pages in length (not including
the Cover Page), you must follow the formatting procedure
listed above, and you must submit your paper through the
plagiarism detection website Turnitin on Canvas by the due date
(instructions for submitting it through Turnitin will be
provided). Note that plagiarism will not be tolerated. If this or
any other course assignment is plagiarized, you will earn an
automatic failure grade in the course.
Follow the format carefully. When you write your paper, divide
it into clearly labeled sections using the headings provided
below. In each section, be sure to address the questions fully.
Any paper that does not include the required labels/titles will
receive a 10-point deduction in the final grade for this
assignment.
I. Cover Page:
II. Introduction
How does the author introduce the article (for example, do they
tell a story to situate the topic, or do they discuss other
research, a media report, an event)? How does the introduction
frame the coming discussion and argument?
III. Argument
What argument(s) does the author make in the paper (for
example, are they saying that some topic hasn't been studied
(enough); or, are they saying that if we study some particular
issue/case it will change (or reaffirm) how we think about some
conception; or, are they saying that if we bring in a different
conception it will change the way we think about a particular
issue/case)?
IV. Structure of the Paper
How does the author go about making the argument in the
paper? What order do they present the information? How do
they layout the article? What sections are in the article, and
what points do they make in each one? How do the sections
build up to the overall argument?
V. Literatures
In what literatures (both theoretical and topical) does the author
situate their work? What works do they cite, and how do they
conceive what they are citing? Note: Not every paper will have
a specific section dedicated to literature review - they may be
embedded in various sections of the paper.
VI. Methodology
How did the author go about collecting that information (data)
used to support their argument? Did they use interviews (who,
with and how many), participant observation (where and how
long), document analysis (historical documents, newspaper
accounts, policy papers, etc.), or statistical data (gather by the
author or some other entity) to name a few? How is the data
presented: is it woven into the text of the article, or is it
presented in some graphic form (maps, charts, graphs, photos)?
How well does the data support the argument that the author is
making?
VII. Conclusion
How does the author summarize their argument(s) one last
time? Do they hint at broader implications of their work beyond
the focus of this article? Do they make a call for more research
in a certain area?
VIII. Bibliography
How many sources does the article cite and what types of
sources are cited? How many of the sources are books? How
many are research articles? How many are other types of
documents (popular media reports - newspaper or magazine
articles, government documents, planning documents, etc.)?
How many are internet sources? Does the author cite
Wikipedia?
Important Notes:
• Do NOT plagiarize any part of this paper or you will receive a
zero for this assignment.
• Most of your paper should summarize the article in your own
words. If you wish to use the wording of the article's author(s)
you should always put quotations marks around it and give the
page number where it can be found. No more than 10% of your
paper should be quotations. If you quote too much, you will lose
points.
• Be sure to read the instructions carefully, and follow them
diligently.

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Tijdschrift voor Economische en Sociale Geografie – 2020, DOI.docx

  • 1. Tijdschrift voor Economische en Sociale Geografie – 2020, DOI:10.1111/tesg.12362, Vol. 111, No. 1, pp. 60–79. © 2019 Royal Dutch Geographical Society KNAG THE GEOGRAPHY OF BORROWING SIZE: EXPLORING SPATIAL DISTRIBUTIONS FOR GERMAN URBAN REGIONS KATI VOLGMANN & KARSTEN RUSCHE Research Institute for Regional and Urban Development GmbH (ILS), Brüderweg 22–24, 44135, Dortmund, Germany. E-mail: [email protected]; [email protected] (Corresponding author) Received: June 2018; accepted: January 2019 ABSTRACT This paper contributes to the discussion on borrowing size effects. According to this concept, smaller cities that are part of larger functional urban regions can utilise metropolitan functions and economic externalities, thereby boosting their regional performance. This is conceptualised in the four-dimension scheme of Meijers and Burger. Consequently, this paper analytically explores and operationalises the borrowed size concept and reveals insights into the relation and spatial distribution of four types of effects: borrowed size, borrowed performance, borrowed function and agglomeration shadow. Research on these spatial
  • 2. effects is applied on a small-scale spatial level and integrates all municipalities in German urban regions. We find different geographies of effects among the four-dimensions of borrowed size. City size and centrality degree show a significant influence on positioning in the four borrowed size effect types. Key words: Borrowed size, borrowed function, borrowed performance, urban growth, metropolitan functions, urban regions INTRODUCTION The current urban development in Europe can be characterised by two important trends. In many cases, the capacity to attract high-order or metropolitan functions (Friedmann 1986; Sassen 1991) and economic development are decoupled from urban size effects (Camagni & Capello 2015), which contradicts standard agglomeration theories (Camagni et al. 2016). There is no clear relationship between urban scale or density and urban productivity (Cox & Longlands 2016; McCann 2016). In addi- tion, the spatial patterns of regional urban growth in European regions are very hetero- genic (Dijkstra et al. 2013) in their extent and direction and are influenced by path depen- dencies, different factor endowments and spe- cific interregional dependencies within and among urban regions (Camagni et al. 2016). For regional policies and policy measures, it is important to be able to identify and classify the phase and spatial shape of regional de-
  • 3. velopments to adapt the right kind of urban policy (Dijkstra et al. 2013), as, for instance, monocentric urban growth necessitates other concepts of infrastructure plans than in more polycentric city development. In explaining these trends and develop- ments, the contemporary literature high- lights a complex understanding of urban and regional growth, which is rooted in different disciplinary and methodological backgrounds. One interpretation of agglom- eration economies and urban dynamics is connected to the concept of ‘borrowing size’ (introduced by Alonso 1973; and reintro- duced by Phelps et al. 2001 & Phelps 2004; mailto: https://orcid.org/0000-0002-5095-3374 mailto: https://orcid.org/0000-0003-1866-7498 mailto:[email protected] mailto:[email protected] THE GEOGRAPHY OF BORROWING SIZE 61 © 2019 Royal Dutch Geographical Society KNAG and currently discussed by Burger et al. 2015; Meijers et al. 2016; Meijers & Burger 2017). The theoretical underpinning of this con- cept discusses the functional enrichment of medium and small cities that are part of larger functional urban regions, where such cities are able to utilise metropolitan urban
  • 4. functions and networks, thereby boosting their regional performance (which can be economic or demographic). In contrast, cit- ies that fail to benefit from the functions and power of bigger neighbours may experience a ‘backwash’ or ‘agglomeration shadow’ ef- fect. Here, a major urban core is dominant in its metropolitan functions and economic development compared to its hinterland (Cardoso & Meijers 2016). The conceptual- isation of the borrowing size dimensions by Meijers and Burger (2017) provides a basis for its operationalisation. The contemporary empirical findings on the borrowed size con- cept reveal a gap in urban research regard- ing the empirical operationalisation and analysis of the spatial distribution and classi- fication of cities in urban regions on a small- scale level using a solid set of indicators and a consistent method. In this paper, we briefly discuss the cur- rent state of the art for the concept of bor- rowed size, focusing on recent empirical findings and advances in logical classifica- tions (second section). The following section introduces our study area – a set of large, me- dium and small cities within the functional German urban regions – and presents the analytical methods and data used to em- pirically explore the spatial heterogeneity of borrowed size effects (third section). For this, we analyse the spatial patterns of bor- rowing size effects and the interrelations among functions, performance and agglom- eration shadow in the cities of the observed
  • 5. German urban regions (fourth section). The results of this empirical study are discussed in the fifth section. THEORETICAL FOUNDATION Concept and origin of ‘borrowed size’ – The origin of the borrowed size concept was intro- duced by Alonso (1973, p. 200), who proposed the idea that a smaller city ‘exhibits some of the characteristics of a larger one if it is near other population concentrations’. This analyt- ical concept focuses on the understanding that people and firms in smaller settlements (low concentration and low rents) retain advantag- es from their locality and are able to exploit advantages from larger nearby settlements (e.g. access to diverse market and services, infrastructure, urban amenities) and avoid agglomeration costs (Camagni et al. 2016; Mei- jers & Burger 2017). An investigation of economic developments in Greater London by Phelps et al. (2001) tested the concept and revealed evidence of borrowing size effects in edge cities, whereby small firms derived advantages from nearby larger urban areas and not from their own local economy. The concept of borrowed size refers to the pro- cess of suburban growth interlinkages, to dis- cussions on edge cities (Phelps 1998) and new economic subcentres (Phelps 2004; Krehl 2015), which are integrated into polycentric urban forms (Phelps 2004). ‘It derives from the ten- sion between forces of agglomeration, on the
  • 6. one hand, and those of decentralisation on the other hand’ (Phelps 2004, p. 981). Currently, there is a variety of papers (Burger et al. 2015; Malý 2016; Meijers & Burger 2017) dealing with the question why some smaller cities in proximity to larger cities have special prerequisites for relatively high economic and population growth. Here, the borrowed size concept is used to explain the need for geographical proximity and functional connectivity to foster economic advantages and a thriving regional economy (Burger et al. 2015). In general, results indi- cate that a place borrows size when it hosts more metropolitan functions than its own size could normally support. Locations in proximity to a larger centre within an urban region can also be related to negative borrowing size effects, the so called ‘agglomeration shadow’ effects. This term is applied in new economic geography (Krugman 1991), which states that ‘growth near concen- trations of firms will be limited by competition effects. Positioning within the “shadow” is not profitable for firms’ (Meijers & Burger 2017, p. 274). That entails a low-risk for agglomera- tion shadow effects in isolated cities compared KATI VOLGMANN AND KARSTEN RUSCHE62 © 2019 Royal Dutch Geographical Society KNAG
  • 7. to cities that are nearby large cities. This is in line with the ideas from central place theory (Christaller 1980) and urban systems theory (Berry 1964), where smaller cities have fewer central place functions or consumer amenities than isolated cities of similar size (Burger et al. 2015; Cardoso & Meijers 2016). In addition, there are also major overlaps to the regional concept of spread and backwash effects, con- ceptualised by Myrdal (1957). It was used to investigate and understand the relationship of growth and decline between urban and rural areas (Henry et al. 1997). Spread effects occur from a centre to its hinterland, causing eco- nomic and population growth. This is in line with the concept of borrowed size effects for cities nearby large cities in which a city profits from urban functions (e.g. infrastructure, pub- lic services) or in economic performance in terms of population and employment growth (Veneri & Ruiz 2016). Backwash effects can be described as a process in which the hinterland allocates resources to centres. These negative effects are very similar to the agglomeration shadow effect. Studies and operationalisation of borrowing size, function and performance – Theoretical and empirical studies build upon and enrich the concept of borrowed size (Polese & Shearmur 2006; Camagni & Capello 2015). They are discordant regarding where, in which regions, and in which cities borrowing size effects occur. Brezzi and Veneri (2015) note that cities near large agglomerations seem to have no significant effect on regional
  • 8. performance (GDP per capita) in multi or polycentric areas, and, even if cities are about the same size, the regional performance is negative. This evidence corresponds to outcomes in north-west Europe (Burger et al. 2015) and the Netherlands (Meijers 2008), in which larger cities with high-order functions spread a shadow over the smaller surrounding centres. This results in places that are in the shadow of larger cities that possess fewer functions than one would expect from their size. Other empirical studies provide an indica- tion of borrowed size effects; smaller cities in large urban regions show positive employment (Polese & Shearmur 2006) and population (Partridge et al. 2007) growth rates. The magnitude of effects depends on the utilisa- tion of high-order urban functions and net- works such as urban infrastructure, density to external linkages, mobility factors and ed- ucation (Polese & Shearmur 2006; Camagni et al. 2015). Veneri and Ruiz (2016) confirm that population growth depends on the sig- nificance of the proximity to the closest main centres – increasing the distance from a large centre increases transportation costs and re- duces population growth, benefits and the use of technology. Some cities, primarily those in long distance to urban centres or those that are small in terms of economic size or old in demographic structure, are not able to benefit from growth effects and are affected by back- wash effects/agglomeration shadow effects
  • 9. (Partridge et al. 2007). Differences between classes of urban re- gions cannot be explained by merely con- sidering agglomeration economies and diseconomies. The benefits of spatially clustered cities are related to their position relative to another city, so borrowing size is linked to the interactions that generate ag- glomeration economies (Polese & Shearmur 2006). Travelling distance (km or time) is one indicator for access to agglomeration externalities. Partridge et al. (2007) consti- tutes that, with every kilometre increase in distance from the small city to the large one, cities experience less population growth. A travel time of one hour allows firms located in smaller cities to access specialised labour market and informational external econ- omies (Phelps et al. 2001). The travel time for accessibility or connectivity is not the only crucial factor that generates spatial ef- fects for the urban hinterland. According to Hesse (2016), the co-operative relationships and exchange of information are important in addition to the physical distance. Cities embedded in specific national or interna- tional networks can benefit from borrowed size effects – ‘borrowed size is less a product of distance or access than it is of true interac- tion’ (Meijers & Burger 2017, p. 288). Hence, smaller cities can substitute their lack of urban mass or city size by being integrated in
  • 10. THE GEOGRAPHY OF BORROWING SIZE 63 © 2019 Royal Dutch Geographical Society KNAG a (inter)national network (Meijers et al. 2016). Larger cities with a certain size and presence of metropolitan functions play a crucial role for urbanisation economies because they have access to a larger (inter) national mar- ket than smaller cities. Burger et al. (2015) note that size is the most important factor ex- plaining the presence of high-order or met- ropolitan functions because a critical mass is crucial and necessary for the existence and gathering of such urban amenities. High-order or metropolitan functions are ‘characterised by higher thresholds for the level of appearance in the city (in terms of urban population)’ (Capello & Camagni 2000, p. 1483) and are sometimes used in terms of high-level occupations, particularly gaining a high percentage of the financial and corpo- rate service sub-sectors (Camagni et al. 2016; Hesse 2016) or service sector employment and office and retail floor space (Phelps 1998). Another approach in this regard addresses functional characteristics and indicators that can be constructed in functional urban re- gions (BBSR 2011). This method is used to identify and select high-level functions of cit- ies using concepts and classifications covering wide-ranging: (i) decision-making and control functions by public and private sectors; (ii) innovation and competition functions; (iii)
  • 11. gateway functions; and (iv) symbolic func- tions (Behrendt & Kruse 2001; Blotevogel & Danielzyk 2009). These functions can be viewed as an expression of geographical power and relate to the hierarchical understanding of urban regions as part of a central place sys- tem (Meijers 2007). That leads to the conclusion that borrowing size effects are stronger where physical prox- imity and accessibility to large cities can be exploited, which underlines the argument for better performance of cities in more polycen- tric urban regions due to interactions among actors sharing agglomeration externalities. However, analysis of spatial and functional dif- ferentiations within urban systems are scarce in terms of their view on urban functions and urban growth interdependencies (Cardoso & Meijers 2016). Redefining ‘borrowed size’ – Recent studies by Meijers and Burger (2017) and Meijers et al. (2016) redefined and stretched the concept of borrowed size along several dimensions in terms of scale and scope. The authors propose a distinction between two dimensions of borrowing size, namely, ‘borrowed performance’ and ‘borrowed functions’ (see Figure 1). Borrowed performance is defined by performance that is better than expected given Source : Meijers and Burger (2017). Figure 1. Dimensions of borrowed size . [Colour figure can be viewed at wileyonlinelibrary.com]
  • 12. www.wileyonlinelibrary.com KATI VOLGMANN AND KARSTEN RUSCHE64 © 2019 Royal Dutch Geographical Society KNAG the size and refers to advantages derived from a pooled and diversified labour market and population spill-overs. Borrowed functions are defined as more functions than expected given the size and can be linked to accumulations of high-order/metropolitan functions, such as artefacts, activities, amenities. If both processes occur simultaneously, the authors define it as the ‘borrowing size’ dimension (Meijers & Burger 2017). The question of agglomeration econo- mies of immobile high-order functions such as universities, airports or infrastructure in urban centres is closely correlated to the spa- tial distribution of borrowed size effects. With access to functions of large cities through con- nectivity (true interaction), smaller cities in the surrounding area can borrow central or metropolitan functions from the city, which may manifest in higher population growth or higher incomes but can unfortunately prevent surrounding cities from having the ability to perform important functions themselves: Whereas growth potentials in terms of urban functions are limited in the sur- rounding areas of large dominant cities,
  • 13. this does not necessarily mean that popu- lation growth is equally restricted (Cardoso & Meijers 2016, p. 1002). Meijers and Burger (2017) conclude that smaller cities support larger cities to maintain more metropolitan functions, so the borrow- ing function occurs more frequently within larger cities, while smaller cities are typically the borrowing performance type. Larger cities are likely to cast a functional agglomeration shadow over the entire urban region by con- centrating many metropolitan functions in its core. Research gap – In this contribution, we investigate the possibilities to operationalise the (stretched) concept of borrowed size. We investigate three research questions that are directly derived from the current state of the art in borrowed size research: (1) How can borrowed size categories be mea- sured statistically? The first objective is to analytically explore and operationalise the concept of the borrowed size. We adopt the redefined concept with its four-dimensions (Meijers & Burger 2017) and explore the relation among borrowed size, performance, function and ag- glomeration shadows. Therefore, it is neces- sary to translate the theoretical and analytical matrix into measurable indicators to catego- rise cities within the German urban regions in
  • 14. terms of their borrowed size dimension. (2) To what extent are cities in German urban regions affected by spatial effects of bor- rowed size? We assume that smaller cities in urban re- gions are affected by borrowed size effects and expect regions that are affiliated with a polycentric urban region enjoy borrowed per- formance or borrowed function effects. More central cities that are predominant to their surroundings should be characterised by bor- rowed size effects and cast an agglomeration shadow on their functional hinterland. The investigation of these spatial distributions is ap- plied on a small scale and integrates all large, medium and small municipalities in German urban regions to determine which cities are af- fected by various borrowed size effects. (3) Do city size and the spatial structure have different effects on borrowing function and borrowing performance? Due to the different spatial structure of German urban regions, we expect different effects along the four-dimensions of borrowed size. We want to find out whether these ef- fects in large cities behave differently vis-à-vis smaller and medium cities. RESEARCH DESIGN Study region – Our spatial reference in this paper is the German urban system. Unlike the
  • 15. French or English urban systems, the German urban system does not contain a large primate city. Instead, it has a polycentric structure of 10–12 leading core cities with significant economic, political and cultural functions (Blotevogel 2000), which makes it a particular- ly interesting example to study borrowed size effects. Due to Germany’s polycentric struc- ture and its historical development – espe- THE GEOGRAPHY OF BORROWING SIZE 65 © 2019 Royal Dutch Geographical Society KNAG cially since reunification – the German urban system constitutes an interesting case study be- cause, within the urban system, there is a wide range of urban regions with different struc- tural and functional conditions. The origin of this structure dates back to the Middle Ages and continues to be reflected in the federal structure of Germany’s political and admin- istrative system (Blotevogel & Hommel 1980). The division of the urban structure was a re- sult of the Second World War and its political aftermath; political-administrative and busi- ness functions were removed from West Berlin and relocated to a number of major regional centres in West Germany. As a consequence, West Germany’s urban system developed a complex polycentric structure (Krätke 2002). In contrast, East Germany continued to be dominated by (East) Berlin, thereby acquiring a monocentric structure (Prigge & Schwarzer
  • 16. 2006). Since reunification in 1990, the system has undergone several dynamic changes. Ber- lin’s status as capital city in 1999 and the fol- lowing relocation of the government led to a repositioning of German cities, however Ber- lin is not comparable to Paris or London. We use a specific functional delineation of urban regions (Siedentop & Kaup 2017). The spatial references are the German mu- nicipalities, so the analysis is done on a small scale. In the first step, we define core cities with at least 200,000 inhabitants and 100,000 employees/jobs (within social insurance). In accordance with these criteria, we identified 32 core cities in the German urban system. Within this group of cities, there are five major large cities with more than 600,000 inhabitants: Berlin, Munich, Hamburg, Frankfurt and Cologne. The remaining 27 core cities are defined as medium cities. It is assumed that each of these core cities plays an important functional role for its urban hin- terland, providing higher-level central places such as economic hubs and employment centres. The functional hinterland of the 32 core cities is calculated by a network analysis, routing from the core city to each municipal- ity focal point (in the hinterland) with a de- fined threshold for real car travel times. The commuting area of a core city was based on a gravitation-curve derived from the number of employees. The core city with the highest employment centralisation had a 60-minute commuting buffer (Berlin), while the lowest
  • 17. was 30 minutes (Erfurt) (see Figure 2). This delineation leads to overlapping urban re- gions, for example, in Duisburg, Essen and Dortmund. Thus, we use a disjunct delinea- tion of urban regions that sorts the munic- ipalities to their individual nearest core (in travel time). This resulted in a group of 20 urban regions, which can be differentiated into monocentric (with one core city) and polycentric (at least two core cities located in the functional urban region) urban re- gions with one or more core cities that are non-overlapping areas. In extension, all mu- nicipalities that show metropolitan functions (according to our indicator) and are neither large in type nor classified as a city regional core, are classified as small cities. Operationalisation of the stretched concept of borrowed size – As discussed in the introduction of the concept, there is a need to define performance as well as metropolitan function variables. In addition, the conceptualisation of the four-field classification relies heavily on the idea that regions perform better or have more functions than you would expect given their size. To enable classification of regions, there is a need for readily definable variables and a concept for defining whether regions do better in a specific variable than one would expect from their size. In the following two sections, we introduce one variable for metropolitan functions and another as a measure for regional performance. In the next section, we discuss how expectations are incorporated
  • 18. into the concept and how we applied it to our sample. Metropolitan functions – The operation- alisation of borrowed functions involves the question of how to enumerate the metropolitan characteristics of a large city to compare them with other cities. A set of indicators was designed to operationalise and quantify metropolitanity. The selection of suitable indicators is determined by whether the pointers reflect metropolitan KATI VOLGMANN AND KARSTEN RUSCHE66 © 2019 Royal Dutch Geographical Society KNAG Source : data from The Regional Database Germany. Cartography: Jutta Rönsch. Figure 2. German urban regions . [Colour figure can be viewed at wileyonlinelibrary.com] www.wileyonlinelibrary.com THE GEOGRAPHY OF BORROWING SIZE 67 © 2019 Royal Dutch Geographical Society KNAG characteristics, namely, whether they conjure up a metropolitan flair or importance (Krätke 2003). Characteristics that purely refer to a city’s structure or trivial size effects
  • 19. such as population or population density are not sufficient indicators. The presence of high-level functions is frequently connected to urban size, but not always. For example, a city such as Zurich, with only 350,000 inhabitants, is specialised in international finance like New York and Tokyo (Capello 1998). Furthermore, the choice of an appropriate indicator depends on a comprehensive data structure for the study region (counties and cities in Germany), the comparability of data sources among time periods and objective and reliable statistics (Volgmann 2014; Growe & Volgmann 2016). Our dataset consists of 47 localised functional attribute indicators for 2008– 2010 (see Volgmann 2014; and Table 1). To simultaneously detect and compare a number of metropolitan facets, the raw data were z-standardised and a metropolitan index for all 47 indicators was constructed from the various indicators (a static indicator) using additive linking. Due to the analysis on the municipality level, the metropolitan index of the counties was transferred to the largest municipality belonging to a county. Each urban municipality has its own index. Urban performance – Although a variety of papers describes concepts for measuring metropolitan functions, there is a lack of empirical answers to the question of how to measure urban performance. In their paper on stretching the concept of borrowed size, Meijers and Burger (2017) describe the general dimensions of performance but do
  • 20. not operationalise the idea in detail. We pair urban performance with metropolitan functions by focusing on a readily available basic economic variable of municipalities: the number of jobs (within social insurance), which is accessible via public regional data sources (regionalstatistik.de). In doing so, we narrow the view on performance to a purely economic point of view, which may not be optimal. For instance, other authors discuss adding information on demographic or income indicators, for example Cardoso and Meijers (2016). Due to a lack of income data on such a local scale and the intended focus on the demand for labour, we suggest using employment data, as it is available on small scales as well as for long time horizons. In addition to the general choice of data to measure performance, it is important to dis- cuss the indicator used to measure the rela- tive performance (a dynamic indicator) of the urban regions. In our view, it is misleading to focus on the absolute change in employment or the pure percentage change in employ- ment in this case. In this research, ‘perfor- mance’ and the shift or relative importance of cities are of utmost importance. When examining absolute changes in employment, cities with an already large employment base tend to have above-average changes between years. Additionally, when examining relative changes, small absolute changes in cities with a small employment base may have relatively high percentage changes. Therefore, our
  • 21. analysis uses the employment shares of cit- ies, which is often used when comparing the economic performance of cities (Dijkstra et al. 2013). Following this logic, we calculate the em- ployment share of each city with a metropol- itan function out of the sum of employment of these cities. We use a subset of 60 munic- ipalities in this case. Then, we compute the changes in those shares between 2008 and 2015. We consider cities that are able to in- crease their share as performing relatively well. Cities that lose relative importance per- form relatively poorly. Expectations ‘given size’ – The final step in operationalising the concept of borrowed size is to define how it can empirically be employed to measure the expected performance and functions. This enables us to assign regions along the dimensional scope of the concept. Meijers and Burger (2017) suggest using a parsimonious regression approach for met- ropolitan function endowment for regions. In their approach, they regressed size on an index of metropolitan functions and used the residuals of that regression to identify how many metropolitan functions a region has. In this empirical logic, a region with a positive residual can be classified as providing more KATI VOLGMANN AND KARSTEN RUSCHE68
  • 22. © 2019 Royal Dutch Geographical Society KNAG metropolitan functions than could be expected using the size as an indicator and vice versa. In our approach, we also use this general logic of regression residuals as an indicator for more or less endowment ‘given the size’. Importantly, we extend this logic in two as- pects. We introduce our performance mea- sure as the second pillar to address the full scope of borrowed size dimensions. We use the residuals of two regressions, which are con- structed following general recommendations in economic geography literature (Combes & Gobillon 2015). Researchers suggest using information on employment or population to measure the size of a local economy. They strongly advise using information on density when analysing regional entities (Ciccone & Hall 1996). Accordingly, we use parsimoni- ous regressions, as suggested by Meijers and Burger (2017), and add density as an explan- atory variable, which is the second conceptual amendment: Table 1. Forty seven localised functional attribute indicators. Control function Innovation function Gateway function Symbolic function Business and finance Research/development in
  • 23. the private sector Transportation Media and cultural economy headcount of the 500 largest companies - turnover of the 500 largest companies - total assets of the 50 largest banks - gross income of the 30 largest insurance companies - stock exchange locations - turnover of the top 30 retail food companies - locations of the 100 most innovative companies in Germany - number of engineers employed - employees working in business-oriented services - employees with an academic degree - patents filed by
  • 24. companies - flight activity at international airports - passenger volumes at international airports - ICE/TGV stations - locations of private and public broadcasting companies - film studios - the 100 largest book publishers - national newspaper publishers - Internet domains - employees working in cultural occupations Policy Science and research Market volume Arts, culture and architecture - locations of federal ministries
  • 25. - number of employees working for the Federal State and the Länder - locations of courts - EU/UN institutions - embassies and consulates - associations - development organisations - foundations - locations of DFG special research areas - research locations belonging to the Helmholtz Community - locations of Max- Planck, Fraunhofer, Leibniz, Academies and Leopoldina - university locations - media units in science-oriented general and university libraries
  • 26. - patents filed by research institutes - employees working in research - transhipment volumes in seaports - transhipment volumes in inland ports - turnover of the top 100 logistic compa- nies (in € million) - air freight volumes at airports - trade fair/exhibition locations – exhibition floorspace (> 100,000 sqm) - locations of buildings by famous architects - locations of Germany’s 25 highest buildings - location of major urban development competitions - opera audiences - theatre audiences
  • 27. - concert audiences - capacities of the 20 largest football stadia - hotel guests Source : Volgmann (2014). THE GEOGRAPHY OF BORROWING SIZE 69 © 2019 Royal Dutch Geographical Society KNAG where MF is the metropolitan index, POP population, and POP.DENSITY is the pop- ulation divided by the settlement area. All values are from 2008. We opted for the use of static indicators because the metropolitan functions do not notably differ between 2008 and 2015. In contrast, in the second regres- sion, the change of the employment share of a municipality between 2008 and 2015 (EMP. SHARE) is explained by the stock of employ- ment in 2008 (EMP) and the employers per settlement area in 2008 (EMP.DENSITY). In the second case, we want to explain a change in employment share to reflect the concept of relative urban performance. As shown in Table 2, we used the residuals of both OLS regressions to classify the 60 mu- nicipalities with metropolitan functions along the four dimensions of borrowed size. For the metropolitan index, we obtained similar ex- planatory power (adj. R2 = 0.86) as the OLS
  • 28. models reported in Meijers and Burger (2017), whereas the employment share calculations performed worse but were still acceptable, with an adjusted R2 of 0.51. ANALYSIS AND EMPIRICAL FINDINGS This section presents a comprehensive picture of the spatial distribution of metropolitan functions and the economic performance in the cities of German urban regions. The spa- tial distribution of the overall metropolitan index in 2008–2010 is shown in Figure 3 for 60 municipalities in German urban regions (above average value). This reveals a hierar- chical system dominated by – roughly – five core cities, with Berlin (414.76) and Munich (260.54) outperforming other German cit- ies, emphasising their dominant function. Together with Hamburg (221.80), Frankfurt (206.12) and Cologne (141.03), they are the leading cities in the German urban system. This corresponds to the theory-based assump- tion of understanding metropolitan functions in the sense of central place theory. The gains of Berlin trace back to the relocation of the government to Berlin. Members of Parliament and their offices, embassies, representative offices of the federal states, political parties, associations, foundations, interest groups and media representations moved to Berlin. The capital of Berlin thus benefited from the relo- cation of public and cultural institutions and from funding and infrastructure investments and became an attractive destination for vis-
  • 29. itors and tourists. Together with the medium sized cities these five large cities build the cen- tral cores of the urban regions of the following analysis, where borrowed effects are investi- gated. Because of the polycentric structure in the German urban system, we expect different spatial interdependencies – some nearby cit- ies may benefit from borrowed function and borrowed performance but some cities may be affected by agglomeration shadows. Figure 4 depicts the changes in employ- ment shares, which is, in our definition, the ‘performance’ of regions for all municipali- ties in the functional urban regions analysed. The 60 cities with a metropolitan index value are highlighted. Notably, the large cities in the German urban system are also those that per- form quite well in relation to other municipal- ities. Berlin, Munich, Hamburg and Cologne led in increasing their share in employment from 2008 to 2015. Interestingly, Leipzig, a medium city, is one of the more thriving (1)MF = POP + POP.DENSITY, (2)EMP.SHARE = EMP + EMP.DENSITY, Table 2. Operationalisation of the four dimensions of borrowing size. Regression on metropolitan index Negative residuals Positive residuals Regression on shift in
  • 30. employment share Negative residuals Agglomeration Shadow Borrowed Functions (20 municipalities) (7 municipalities) Positive residuals Borrowed Performance Borrowed Size (16 municipalities) (17 municipalities) Source : own illustration based on Meijers and Burger (2017). KATI VOLGMANN AND KARSTEN RUSCHE70 © 2019 Royal Dutch Geographical Society KNAG Source : own calculations. Cartography: Jutta Rönsch. Figure 3. Metropolitan index in cities of German urban regions (2008–2010) . [Colour figure can be viewed at wileyonlinelibrary.com] www.wileyonlinelibrary.com THE GEOGRAPHY OF BORROWING SIZE 71 © 2019 Royal Dutch Geographical Society KNAG Source : data from The Regional Database Germany. Cartography: Jutta Rönsch. Figure 4. Employment growth in the cities of German urban regions (changes of employment shares 2008–2015) . [Colour figure can be viewed at wileyonlinelibrary.com]
  • 31. www.wileyonlinelibrary.com KATI VOLGMANN AND KARSTEN RUSCHE72 © 2019 Royal Dutch Geographical Society KNAG cities in Germany. Despite this major devel- opment, there is no clear dominant growth in employment shares in specific urban regions. All functional urban regions host a mix of rel- atively low and high-performing hinterlands. For the more monocentric, high-performing regions, the picture is dominated by relatively well-performing regions. In addition to this general impression of changes in employment shares, our approach also shows the degree of functional or performance expectations derived from the regression residuals. Using the information gathered in the two regres- sions, we built the four-group classification listed in Table 2. We assigned a specific type of borrowed size to all cities with metropoli- tan functions. The scatterplot in Figure 5 depicts the re- siduals of both regressions for the 60 munici- palities in our study. Divided by the zero values of both axes and the three city-types large, medium and small city, the four dimensions of the borrowed size concept can be differen- tiated. Most of the data pairs of residuals are scattered around the central of the axis, show- ing that there are detectable deviations from the expected values and that the data are not
  • 32. heavily influenced by outliers, which is an- other argument for the goodness of fit of our empirical approach. Only two data points are at the far ends of the scatterplot. One is Berlin, which performed much better than predicted while having slightly fewer metropolitan func- tions (why it is classified as ‘borrowing perfor- mance’). The other is the city of Frankfurt am main, which performed slightly worse than expected but hosts many more metropolitan functions given its size (why it is classified as ‘borrowing function’). To extend the distribution of regression re- siduals, the classification results can be used to map the results for additional conclusions. Figure 6 and Table 3 show the borrowed size types of our sample of 60 municipalities. Source : own calculations and illustration. Figure 5. Scatterplot of regression residuals . [Colour figure can be viewed at wileyonlinelibrary.com] www.wileyonlinelibrary.com THE GEOGRAPHY OF BORROWING SIZE 73 © 2019 Royal Dutch Geographical Society KNAG Source : own calculations. Cartography: Jutta Rönsch. Figure 6. Effects of borrowing size in German urban regions . [Colour figure can be viewed at wileyonlinelibrary.com]
  • 33. www.wileyonlinelibrary.com KATI VOLGMANN AND KARSTEN RUSCHE74 © 2019 Royal Dutch Geographical Society KNAG Mapping the spatial distribution of the types and the relation with other cities that belong to a common functional urban region pro- vides further insight into the (functional) re- lationship among larger, medium and small cities in their specific regional contexts. The large cities of Berlin, Munich, Hamburg, Cologne and Frankfurt act as the leading cen- tres of growth in the German urban system, showcasing a diverging picture in their individ- ual borrowed size classification. Munich is the only city with above-average values in terms of metropolitanity and performance and there- fore its development may be attributed to bor- rowing size from its hinterland. In addition, we find the dimension of borrowed size in 16 small cities (see Table 3) surrounding large cities such as Munich, Frankfurt am main, Cologne and Berlin. This indicates that small cities nearby larger agglomerations are success- ful in profiting from economic performance and functions due to their city-regional loca- tion. Thus these results correspond to Meijers and Burger (2017) assumption, that these pro- cesses occur more often in polycentric regions with equally sized neighbouring cities but is not reserved to small cities – in this case Munich.
  • 34. Meijers and Burger (2017) assume that bor- rowing functions preferentially occur more often in large cities. This can be seen in seven cases: Hamburg, Cologne and Frankfurt am main, but also for the medium core cities Hanover, Dusseldorf, Bonn and Stuttgart. Berlin is the only large city with borrowing per- formance effects. All other large cities have a greater degree of metropolitanity than would be expected given their size. Therefore, large cities occupy an important position in the German urban system, supported by individ- ual, nearby medium and small cities within a city-regional network. Some small and medium cities (Esslingen, Ludwigsburg, Waiblingen near Stuttgart and Darmstadt, Mainz, Bad Homburg near Frankfurt am main and Neuss near Dusseldorf) in the surrounding area ben- efit from employment effects but do not ful- fil any important metropolitan functions. As part of a polycentric urban region, they have access to the metropolitan functions of the neighbouring large city and agglomeration ad- vantages (e.g. high-order services, institutions, and infrastructure such as research labs, edu- cational institutions, and airports), resulting in positive structural effects. Other small cit- ies in close proximity to large growing cities benefit from spatial proximity and connectiv- ity to functions, thereby enriching themselves functionally and structurally (borrowed-sized effects). These regions are complemented by solitary urban regions Augsburg, Freiburg, Erfurt and Muenster. The coexistence of large, medium and small cities and the diverse spa-
  • 35. tial structure in urban regions is a key charac- teristic in the German urban system. In contrast to the positive feedback and spillover effects 20 cities are characterised by negative effects from being located in close proximity to larger cities. They perform worse than expected and have fewer metro- politan functions given their size: they are affected by agglomeration shadow. These ef- fects occur in two city-regional settings: in the structurally weak Ruhr area and Bergisches Land (Dortmund, Essen, Duisburg, Bochum, Wuppertal, Monchengladbach) in the polycen- tric Rhine-Ruhr urban region and in less-cen- tral monocentric urban regions defined by medium cores Dresden, Aachen, Bremen, Bielefeld, Magdeburg as well as the slightly polycentric urban regions Erfurt, Nuremberg. In the first case, the large centres Dusseldorf, Cologne and Bonn cast an Table 3. Distribution of borrowed size types by city type. Borrowed size type Large city Medium city Small city Total Agglomeration shadow - 15 5 20 Borrowed function 3 4 - 7 Borrowed performance 1 7 8 16 Borrowed size 1 - 16 17 total 5 26 29 60 Source : own calculations and illustration.
  • 36. THE GEOGRAPHY OF BORROWING SIZE 75 © 2019 Royal Dutch Geographical Society KNAG agglomeration shadow over the Ruhr cities. In the second case, this cannot explain the classification of the more solitary urban re- gions. Size and influence of smaller German urban regions appear to be too small, as they are able to absorb a minimum level of met- ropolitan functions. This idea of a minimum threshold of ‘urbanity’ can be transferred to the whole urban system when examining the spatial distribution of borrowed size effects. Dominating urban regions such as Berlin, Munich or Hamburg cast an agglomeration shadow over the whole urban system in the sense of defining a minimum level of relative metropolitanity and economic performance for other urban region cores. If small and me- dium cities are more isolated in terms of the distance to major urban regions or the lack of supporting cities in their functional regions, it is more likely that this region will not be able to keep up with the performance of the whole urban system. Also, the German urban system allows for an analysis of different types of urban regions - monocentric or polycentric urban regions. Monocentric regions are regions with only one core city and polycentric urban regions are regions with more than two core cities (Table 4). Cities in large polycentric urban
  • 37. regions tend to be of the type ‘borrowing functions’. So, these types of regions are able to transfer functional advantages to the en- tire urban region. By contrast, rather small monocentric urban regions without a major city in terms or population size do not gen- erate any borrowed size effects. Importantly, larger monocentric regions are more effective in terms of borrowing performance, which is linked to the classical understanding of ag- glomeration economies. Table 4. Distribution of borrowed size types by spatial structure of the urban region. City-region Agglomeration shadow Borrowed function Borrowed performance Borrowed size Total Monocentric urban regions Aachen 1 1 2 Augsburg 1 1 Bielefeld 1 1 Bremen 1 1
  • 38. Dresden 1 1 Freiburg 1 1 2 Kiel 1 1 Leipzig 1 1 Magdeburg 1 1 Muenster 1 1 Chemnitz Monocentric urban regions 5 - 5 2 12 Polycentric urban regions Berlin 1 1 2 Erfurt 2 2 Hamburg 1 1 2 Hannover 1 1 1 3 Munich 4 4 Nuremberg 1 1 Rhine-Ruhr 8 3 2 3 16 RhineMain/ RhineNeckar /Karlsruhe 3 1 4 4 12 Stuttgart 1 3 2 6 Polycentric urban regions 15 7 11 15 48
  • 39. Source : own calculations and illustration. KATI VOLGMANN AND KARSTEN RUSCHE76 © 2019 Royal Dutch Geographical Society KNAG CONCLUSION Using German urban regions as an example, our paper contributes to the discussion on borrowing size effects. According to this con- cept, smaller cities that are part of larger func- tional urban regions can utilise high-order urban functions and economic dependencies, thereby boosting their regional performance. This is conceptualised in the four-dimension concept of Meijers and Burger (2017), which we further operationalised and assessed in terms of performance and function (see third section). We employed our empirical approach to classify cities along the four dimensions of the borrowed size concept to describe and eval- uate the spatial distribution of borrowed size effects in the German urban system (see fourth section). The German urban regions offer the op- portunity to test the variety of the geography of borrowing size on local scale. Concerning the interpretation and understanding of our results, we state that urban regions are cen- tral and important driving forces in regional economics (Scott et al . 2001). The interrela- tions between large cities as international
  • 40. nodes and inner-city as well as suburban func- tional differentiations form an integrated sys- tem of spatial division of labour (Kloosterman & Musterd 2001; Parr 2014). In its geograph- ical scope, the expansion and direction of regional urban development unfolds increas- ingly heterogeneous (Dijkstra et al. 2013). As we show in this paper, functional and eco- nomic growth is not solely concentrated on major cities. But the size of a city seems to be one central factor explaining the presence of metropolitan functions. Nevertheless, this general tendency needs to be confronted with the specific city regional contexts like the spa- tial structure. Whether a city is relatively small or large or is located in a monocentric or poly- centric urban region has a significant impact on the four occurring borrowed size effects. We provide evidence for economic and functional interrelations linked to large cities and their hinterland, which have been charac- terized as ‘interplaces’ by Phelps (2017). His argumentation is based on the fact that the contemporary economy is not purely divided into agglomerations (place) and networks (space) but consists also of enclaves of export processing zones and arenas of trade fairs – which are labelled interplaces. Other con- cepts about polycentrism (Burger & Meijers 2012; van Meeteren et al. 2016; Rauhut 2017), Edge Cities (Garreau 1992) or New economic sub-centres (Krehl 2015; Kane et al. 2018) see urban regions as economic and social entities in which processes of concentration and de-
  • 41. concentration take place. Those processes of concentration and de- concentration depend on internal and exter- nal agglomeration economies, which occur within functional urban regions and differ in size and functional structure – which we described with the four dimensions of the borrowed size concept. This interpretation is linked to the theoretical argumentation that agglomeration economies are not limited to the physical boundaries of a city. Moreover, they spill over to surrounding areas or cities (Parr 2002). This understanding is thereby enriched by the concept of borrowed size, in which the role of urban benefits is an essential explanatory variable for urban development (Burger et al. 2015; Hesse 2016; Malý 2016; Meijers & Burger 2017). To support regional development, agglomeration economies can be linked to the regional spatial and func- tional structure: improvements in regional transport and information and communica- tion technologies support borrowing size in urban regions (Brezzi & Veneri 2015). Our approach can be viewed as a starting point for further research employing the op- erationalised concept of borrowed size. Future research could focus on a differentiation of the metropolitan index on a much broader variety of urban functions to exploit the richness of the data and gather more detailed information on the typical functions for each borrowed func- tion dimension, how this is linked to spatial co-agglomeration and if change interdependen-
  • 42. cies occur over time. It could be possible, that the distribution and specialisation of several metropolitan functions between cities in urban regions gives an indication of which metropoli- tan functions can be borrowed from surround- ing smaller and medium cities. In addition to developing the conceptual approach with other variables there is a need for a deeper understanding of the driving THE GEOGRAPHY OF BORROWING SIZE 77 © 2019 Royal Dutch Geographical Society KNAG forces of the spatial distribution of the borrow- ing size dimensions. This would explain the influencing factors for the ability of some cit- ies to lend and use the critical mass or city size close to the large cities. Empirical indicators that would help explaining this relation are in- come indicators, transport connections and ac- cessibility (see also Agnoletti et al. 2015) as well as the commuter flows within urban regions. For regional policies and policy measures, it is important to be able to identify and classify the phase and spatial shape of regional develop- ments to adapt the right kind of urban policy (Dijkstra et al. 2013). In the future, small and medium cities in the surrounding should play a specific role for urban re-development and planning policies (Hesse & Siedentop 2018). REFERENCES
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  • 51. & F. Witlox (2016), Pacifying Babel’s Tower: A Scientometric Analysis of Polycentricity in Urban Research. Urban Studies 53, pp. 1278–1298. Veneri, P. & V. Ruiz (2016), Urban-to-rural Population Growth Linkages: Evidence from OECD TL3 Regions. Journal of Regional Science 56, pp. 3–24. Volgmann, K. (2014), Entwicklung Metropolitaner Funktionen im Polyzentralen Deutschen Städtesystem: Raummuster der Konzentration und Funktionalen Spezialisierung. Raumforschung Und Raumordnung 72, pp. 21–37. The Analysis Paper: For the paper, you will need to follow the format given below in analyzing and summarizing the components of the research article about which you are writing. Remember that you are only using ONE article in the part of the project. In completing the following format, you will need to read each section of the article you are using very carefully, possibly more than once. Your paper should be at-least 6 pages in length (not including the Cover Page), you must follow the formatting procedure listed above, and you must submit your paper through the plagiarism detection website Turnitin on Canvas by the due date (instructions for submitting it through Turnitin will be provided). Note that plagiarism will not be tolerated. If this or any other course assignment is plagiarized, you will earn an automatic failure grade in the course. Follow the format carefully. When you write your paper, divide it into clearly labeled sections using the headings provided
  • 52. below. In each section, be sure to address the questions fully. Any paper that does not include the required labels/titles will receive a 10-point deduction in the final grade for this assignment. I. Cover Page: II. Introduction How does the author introduce the article (for example, do they tell a story to situate the topic, or do they discuss other research, a media report, an event)? How does the introduction frame the coming discussion and argument? III. Argument What argument(s) does the author make in the paper (for example, are they saying that some topic hasn't been studied (enough); or, are they saying that if we study some particular issue/case it will change (or reaffirm) how we think about some conception; or, are they saying that if we bring in a different conception it will change the way we think about a particular issue/case)? IV. Structure of the Paper How does the author go about making the argument in the paper? What order do they present the information? How do they layout the article? What sections are in the article, and what points do they make in each one? How do the sections build up to the overall argument? V. Literatures In what literatures (both theoretical and topical) does the author situate their work? What works do they cite, and how do they conceive what they are citing? Note: Not every paper will have a specific section dedicated to literature review - they may be embedded in various sections of the paper.
  • 53. VI. Methodology How did the author go about collecting that information (data) used to support their argument? Did they use interviews (who, with and how many), participant observation (where and how long), document analysis (historical documents, newspaper accounts, policy papers, etc.), or statistical data (gather by the author or some other entity) to name a few? How is the data presented: is it woven into the text of the article, or is it presented in some graphic form (maps, charts, graphs, photos)? How well does the data support the argument that the author is making? VII. Conclusion How does the author summarize their argument(s) one last time? Do they hint at broader implications of their work beyond the focus of this article? Do they make a call for more research in a certain area? VIII. Bibliography How many sources does the article cite and what types of sources are cited? How many of the sources are books? How many are research articles? How many are other types of documents (popular media reports - newspaper or magazine articles, government documents, planning documents, etc.)? How many are internet sources? Does the author cite Wikipedia? Important Notes: • Do NOT plagiarize any part of this paper or you will receive a zero for this assignment. • Most of your paper should summarize the article in your own words. If you wish to use the wording of the article's author(s) you should always put quotations marks around it and give the page number where it can be found. No more than 10% of your paper should be quotations. If you quote too much, you will lose
  • 54. points. • Be sure to read the instructions carefully, and follow them diligently.