1) Experimental economics publication has increased over the past decade, with 75% more papers published from 2006-2010 than 2001-2005. 2) The most popular topics studied are social preferences, individual decision making, games, and markets. Interest in social preferences and games is growing. 3) While North America remains the largest source of research, there has been a modest increase in European research and decrease in North American research.

1. Charles Noussair
Tilburg University
Trends in publication: Experimental Economics

2. What I do here
 Study is in the spirit of the Journal of Economic
Surveys, and the conference theme of Current and
Future Trends.
 I try to give some broad perspective about research
trends within a field, in this case experimental
economics.
 I consider developments in journal publishing
patterns in the field of experimental economics
during the decade Jan. 2001 – Dec. 2010.
 Analyze what has been published in the area in 9
leading outlets. Consider trends within the 10 year
period, topics covered, and geographical location
of research.
Trends in publication: Experimental Economics

3. The type of articles considered
 I consider laboratory experiments only. The unit of
observation is the journal article.
 Include only studies conducted using traditional laboratory
techniques. If this methodology is employed to gather at
least some of the data reported in the paper, it is included
in the data set.
 Features of the methodology
 Student subjects as participants
 Conducted in a controlled laboratory setting
Trends in publication: Experimental Economics

4. Typical Physical Layout of an
Experimental Laboratory
Trends in publication: Experimental Economics

5. What is not included
 I leave out field experiments. These are experimental
studies that relax one or more of the aforementioned
aspects of the methodology.
 The boundary between field experimental and non-experimental
research is hard to precisely establish.
 I also leave out neuroeconomic studies, since they
arguably involve a new methodology, and their prime
focus is on physiological data.
 I leave out comments, and replies, as well as surveys
and meta-analyses that do not report new data.
Trends in publication: Experimental Economics

6. The data set
 Consists of all experimental papers published in nine prominent
journals.
 Six of these are prestigious general interest journals.
 American Economic Review (not including Papers and
Proceedings), Econometrica, The Economic Journal, Journal
of Political Economy, The Quarterly Journal of
Economics, and Review of Economic Studies.
 The three others are prestigious specialized journals that publish
many articles in experimental economics.
 Games and Economic Behavior, Journal of Economic Behavior
and Organization, and Experimental Economics.
 A total number of 716 experimental papers identified
Trends in publication: Experimental Economics

7. The number of published papers in experimental
economics is increasing (75% increase in 2006 – 2010
over 2001-2005)
Number of articles published
500
450
400
350
Number of articles
300
250 Six general
journals
200
150 Three
specialized
100 journals
50
0
2001-2005 2006-2011
Years
Trends in publication: Experimental Economics

8. The percentage of journal articles that report
experiments is also increasing
Percentage of experimental articles from those appearing in
the journals
25
20
15
Percentage
2001-2005
2006-2010
2001-2010
10
5
0
AER JPE QJE ECTA RES EJ GEB JEBO
Trends in publication: Experimental Economics

9. The denominator: Overall number of papers in general
interest journals is not increasing. However, it is
increasing in GEB, JEBO, and EE
Number of articles published overall
450
400
350
300
Number of articles
250
Six general interest
200 journals
150
Three specialized
journals
100 Experimental
Papers/Six Gen
50
Experimental
0
Papers/Three Spec.
2000 2001 2002 2003 2004 2005 2006 2007 2008 2009 2010 2011
Year
Trends in publication: Experimental Economics

10. What topics do the experiments consider?
Distribution of Topics Studied
Individual
Decisions
Social
Preferences
Markets
Games
Macro/Political
Economy
Other
95% of studies can be put into four categories
Trends in publication: Experimental Economics

11. The most popular topics
 Social Preferences (35.4% of all papers)
 Investigate dependence of preferences on payoffs of other individuals
and history of play.
 Rather than preferences of the form ui(xi), assume that they are of the
form ui(x1,…,xn, H).
 Try to uncover nature of ui(x1,…,xn, H), including the role of
altruism, envy, reciprocity, and efficiency.
 Three very popular areas within social preferences:
 (1) Social dilemmas (13.1% of all papers): These are settings in which
self-interest and group interest lead to different behavior.
 Two-principal paradigms, the Prisoner’s Dilemma and Voluntary
Contributions to a Public Good, are used.
 In these games, individuals choose between cooperation and
defection (decision is all-or nothing in Prisoners’ Dilemma;
intermediate choices are possible in Voluntary Contributions).
 Used to study the determinants of cooperation.
Trends in publication: Experimental Economics

12.  Dictator/Ultimatum games (9.6%):
 Two parties have an endowment to divide. One party proposes a
division.
 In the ultimatum game, the other party can reject. If she
rejects, both players receive zero. If she accepts, the proposed
division is implemented.
 In the dictator game the other party cannot reject and the proposal
is implemented.
 Used to study altruism, envy, and reciprocity.
 Trust/Gift exchange games (9.5%):
 In a trust game one individual can transfer a portion of her
endowment to another player.
 The amount transferred gains value.
 Then the second party can return any portion of what he received.
Used to study reciprocity.
 A gift exchange game has similar incentives but in a
worker/employer context.
Trends in publication: Experimental Economics

13. The most popular topics
 Individual decision making (14.2% of all papers)
 Risk (4.6%)
 Testing theories, measuring risk tolerance
 Consumer Behavior/ Willingness-to-pay (2.9%)
 Preference over products, how to elicit WTP information
 Markets (24.3% of papers)
 Auctions (9.9%)
 Testing theories, comparing auction types
 Asset Markets (4.7%)
 Bubbles, Informational efficiency
 Industrial Organization (5.5%)
 Testing models of interaction between firms
 Games (21.0% of papers)
 Coordination (6.2%)
 Equilibrium selection
 Beauty contest (1.9%)
 Measures to what extent rationality is common knowledge within a group
Trends in publication: Experimental Economics

14. How is interest in these topics changing
over time within the field?
 Consider within the journal Experimental Economics.
 Level playing field between topics
 Barometer of what the field itself is interested in.
 Each of the four major areas listed above is increasing in
coverage Topics of experimental studies published:
40 Experimental Economics, 2001-2010
35
30
25
Number of articles
20 2001-
2005
15
2006-
10 2010
5
0
Ind choice Social preferences Markets Games
Topic
Trends in publication: Experimental Economics

15. What topics interest the broader profession?
Consider the six general interest journals
Topics: SIx General Interest Journals
30
Interest growing
in Social
25
Preferences, Ind
ividual
Choice, and
20
Games
Number of articles
2001-2005
15
2006-2010
10
5
0
Individual Decisions Social Preferences Markets Games
Topic
Trends in publication: Experimental Economics

16. Geographical distribution
Geographical distribution of research conducted
1.2
1
3.3 3.2
Asia-Pacific
Europe
Percentage of all articles
0.8
43.1 47.8
North
0.6
America
0.4
53.6 48.9
0.2
0
2001-2005 Time period 2006-2010
Trends in publication: Experimental Economics

17. Conclusions
 The number of articles reporting laboratory experimental
studies has been increasing over the last decade.
 The percentage of articles appearing in major journals
reporting laboratory experiments is also increasing.
 Four topics dominate the field: Social
preferences, individual decision making, games, and
markets.
 There has been a modest increase in the share of research
conducted in European laboratories and a modest decrease
in the share done in North America.
Trends in publication: Experimental Economics