This document summarizes a study that examines the causal relationship between money, income, and prices in Bangladesh from 1972/73 to 2009/10. It finds:
1) Money, income, and prices are cointegrated, indicating a long-run relationship.
2) Bivariate analysis finds bidirectional causality between money and income, supporting neither Keynesians nor Monetarists. It finds unidirectional causality from money to prices, supporting Monetarists.
3) Trivariate analysis also finds bidirectional causality between money and income conditional on prices, and unidirectional causality from money to prices conditional on income.
So monetary policy should consider feedback effects between money and income
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Discrete time prey predator model with generalized holling type interactionZac Darcy
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This 10 hours class is intended to give students the basis to empirically solve statistical problems. Talk 1 serves as an introduction to the statistical software R, and presents how to calculate basic measures such as mean, variance, correlation and gini index. Talk 2 shows how the central limit theorem and the law of the large numbers work empirically. Talk 3 presents the point estimate, the confidence interval and the hypothesis test for the most important parameters. Talk 4 introduces to the linear regression model and Talk 5 to the bootstrap world. Talk 5 also presents an easy example of a markov chains.
All the talks are supported by script codes, in R language.
Discrete time prey predator model with generalized holling type interactionZac Darcy
We have introduced a discrete time prey-predator model with Generalized Holling type interaction. Stability nature of the fixed points of the model are determined analytically. Phase diagrams are drawn after solving the system numerically. Bifurcation analysis is done with respect to various parameters of the system. It is shown that for modeling of non-chaotic prey predator ecological systems with Generalized Holling type interaction may be more useful for better prediction and analysis.
On the Numerical Fixed Point Iterative Methods of Solution for the Boundary V...BRNSS Publication Hub
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A Primer on Cointegration: Application to Nigerian Gross Domestic Product and...IOSR Journals
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Autocorrelation Function (ACF), we find that each of the variables (GDP and Export) is non-stationary.
Augmented Engle-Granger reveals that the regression of GDP on Export is actually cointegrated and not
spurious. An error correction model shows that GDP does not adjust to change in EXP in the same time period.
The regression model obtained also shows that the short-run changes in EXP have a positive impact on the
short-run changes in GDP.
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Flip bifurcation and chaos control in discrete-time Prey-predator model irjes
The dynamics of discrete-time prey-predator model are investigated. The result indicates that the
model undergo a flip bifurcation which found by using center manifold theorem and bifurcation theory.
Numerical simulation not only illustrate our results, but also exhibit the complex dynamic behavior, such as the
periodic doubling in period-2, -4 -8, quasi- periodic orbits and chaotic set. Finally, the feedback control method
is used to stabilize chaotic orbits at an unstable interior point.
Shear reversal simulations of a dense glass -forming supercooled colloidal melt: Rheology, microstructure and puzzles. Using non-equilibrium MD technique in nano to micro meter lengthscale and microsecond timescale, we show how "Bauschinger effect" can be realized in dense colloids.
On the Numerical Fixed Point Iterative Methods of Solution for the Boundary V...BRNSS Publication Hub
In this research work, we have studied the finite difference method and used it to solve elliptic partial differential equation (PDE). The effect of the mesh size on typical elliptic PDE has been investigated. The effect of tolerance on the numerical methods used, speed of convergence, and number of iterations was also examined. Three different elliptic PDE’s; the Laplace’s equation, Poisons equation with the linear inhomogeneous term, and Poisons equations with non-linear inhomogeneous term were used in the study. Computer program was written and implemented in MATLAB to carry out lengthy calculations. It was found that the application of the finite difference methods to an elliptic PDE transforms the PDE to a system of algebraic equations whose coefficient matrix has a block tri-diagonal form. The analysis carried out shows that the accuracy of solutions increases as the mesh is decreased and that the solutions are affected by round off errors. The accuracy of solutions increases as the number of the iterations increases, also the more efficient iterative method to use is the SOR method due to its high degree of accuracy and speed of convergence
Markov chain is one of the techniques used in operations research with possibilities view that managers in organizational decision making industrial and commercial use it. Markov processes arise in probability and statistics in one of two ways. Markov process is a tool to predict that it can make logical and accurate decisions about various aspects of management in the future. Wai Mar Lwin | Thinn Aung | Khaing Khaing Wai "Applications on Markov Chain" Published in International Journal of Trend in Scientific Research and Development (ijtsrd), ISSN: 2456-6470, Volume-3 | Issue-5 , August 2019, URL: https://www.ijtsrd.com/papers/ijtsrd27881.pdfPaper URL: https://www.ijtsrd.com/mathemetics/applied-mathematics/27881/applications-on-markov-chain/wai-mar-lwin
A Primer on Cointegration: Application to Nigerian Gross Domestic Product and...IOSR Journals
This paper examines Gross Domestic Product (GDP) and Export (EXP) of Nigeria between 1970
and 2007 using data from Central Bank of Nigeria’s Statistical Bulletin of 2008 for cointegration. Applying
Autocorrelation Function (ACF), we find that each of the variables (GDP and Export) is non-stationary.
Augmented Engle-Granger reveals that the regression of GDP on Export is actually cointegrated and not
spurious. An error correction model shows that GDP does not adjust to change in EXP in the same time period.
The regression model obtained also shows that the short-run changes in EXP have a positive impact on the
short-run changes in GDP.
Study of Correlation Theory with Different Views and Methodsamong Variables i...inventionjournals
Correlation among two numbers is an important concept and this relationship among two variables may be direct or indirect/inverse. Generally, correlation of two numbers is studyin statistics .The different types of correlation among numbers may be positively correlated, negatively correlated and perfectly correlated in statistics. Generally theserelationship is direct or indirect/inverse.So,in this paper it is tried to explore correlation among numbers/variables inunitary methods, ratio and proportion, variation methods.
Flip bifurcation and chaos control in discrete-time Prey-predator model irjes
The dynamics of discrete-time prey-predator model are investigated. The result indicates that the
model undergo a flip bifurcation which found by using center manifold theorem and bifurcation theory.
Numerical simulation not only illustrate our results, but also exhibit the complex dynamic behavior, such as the
periodic doubling in period-2, -4 -8, quasi- periodic orbits and chaotic set. Finally, the feedback control method
is used to stabilize chaotic orbits at an unstable interior point.
Shear reversal simulations of a dense glass -forming supercooled colloidal melt: Rheology, microstructure and puzzles. Using non-equilibrium MD technique in nano to micro meter lengthscale and microsecond timescale, we show how "Bauschinger effect" can be realized in dense colloids.
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Granger Causality Test: A Useful Descriptive Tool for Time Series DataIJMER
Interdependency of one or more variables on the other has been in the existence over long
time when it was discovered that one variable has to move or regress toward another following the
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Money Supply to know the type of causality in existence in the two time series variables under
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Finding the Extreme Values with some Application of Derivativesijtsrd
There are many different way of mathematics rules. Among them, we express finding the extreme values for the optimization problems that changes in the particle life with the derivatives. The derivative is the exact rate at which one quantity changes with respect to another. And them, we can compute the profit and loss of a process that a company or a system. Variety of optimization problems are solved by using derivatives. There were use derivatives to find the extreme values of functions, to determine and analyze the shape of graphs and to find numerically where a function equals zero. Kyi Sint | Kay Thi Win "Finding the Extreme Values with some Application of Derivatives" Published in International Journal of Trend in Scientific Research and Development (ijtsrd), ISSN: 2456-6470, Volume-3 | Issue-6 , October 2019, URL: https://www.ijtsrd.com/papers/ijtsrd29347.pdf Paper URL: https://www.ijtsrd.com/mathemetics/other/29347/finding-the-extreme-values-with-some-application-of-derivatives/kyi-sint
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Money, income, and prices in bangladesh a cointegration and causality analysis
1. Journal of Economics and Sustainable Development www.iiste.org
ISSN 2222-1700 (Paper) ISSN 2222-2855 (Online)
Vol.3, No.7, 2012
Money, Income, and Prices in Bangladesh: A Cointegration and
Causality Analysis
Md. Nisar Ahmed Shams
Associate Professor, Department of Economics
Jahangirnagar University, Savar, Dhaka -1342, Bangladesh
E-mail: nishu11us@yahoo.com
Abstract
This paper re-examines the causal relationship between money, income and prices in Bangladesh during the
period 1972/73 to 2009/10. Cointegration analysis indicates a long-run relationship among the variables. Based
on the Error Correction Model (ECM), a bidirectional causality between money and income has been observed.
Therefore, monetary policy should be formulated by taking into account the feedback effects of output on
money. Money supply can be considered as an effective control variable as causality is found to run from money
to prices supporting the Monetarists.
Key Words: Cointegration, Error Correction Model, Bivariate Causality, Trivariate Causality, Bangladesh.
1. Introduction
The relationship between money, income, and prices has been a matter of debate among different economists
particularly between the Monetarists and Keynesians. The Monetarists consider money supply to be the
important factor leading to changes in income and prices. Thus, the direction of causation runs from money to
income and prices without any feedback. On the contrary, the Keynesians asserts that changes in income leads to
changes in the stock of money through the demand for money. Therefore, the direction of causation runs from
income to money without any feedback.
The causal relationship between money and the other two variables, i.e., income and prices has been an issue
argued by economists particularly after the seminal paper by Sims (1972). Using post-war quarterly data for
U.S. in a bivariate framework, he found evidence of unidirectional causality from money to income as claimed
by the monetarists. However, this result was not obtained by subsequent studies. Replicating Sims’ test in the
Canadian economy, Barth & Bannett (1974) showed bidirectional causality between money and income.
Williams et al. (1976) employing a similar approach found evidence of unidirectional causality from income to
money in case of U.K., opposite to Sims’ findings. However, Dyreyes et al. (1980) showed evidence of
bidirectional and unidirectional causality between money and income in U.S. and Canada respectively.
Concerning the relationship between money and prices, the studies undertaken by Bengali et al. (1999), Husain
& Rashid (2006) found evidence of unidirectional causality running from money to prices in Pakistan. Lee & Li
(1983) showed unidirectional causality from money to price in Singapore. Causality is also found to run from
money supply to price movements in Malaysia as observed by Ghazali et al. (2006). The results obtained by
these studies confirm the claim made by the Monetarists. On the contrary, Jarrah (1996) found money to be
Granger caused by prices in Saudi Arabia. Mishra et al. (2010) also found unidirectional causality from price
level to money supply in India.
Regarding Bangladesh, Jones & Sattar (1988) examined the causal relationship between money-income and
money-inflation. They found evidence of unidirectional causality from money to output. Similar result was also
obtained regarding the relationship between money and prices. Therefore, monetary expansion could have a
significant impact on output growth while there might be inflation in the economy. Shams et al. (2010) found
unidirectional causality from money to income in Bangladesh. Ahmed (2003) while investigating multivariate
causality among money, interest rates, prices and output, identified bidirectional causality between money and
prices in Bangladesh.
The objective of this paper is to re-examine the causal relationship between money-income and money- prices in
Bangladesh. The study concentrates on Cointegration and Error Correction Model (ECM) to look into the
bivariate causal relationship by taking care of the stochastic properties of the variables. The major drawback of
bivariate analysis is the exclusion of relevant variable(s). Such omission may lead to erroneous conclusions.
82
2. Journal of Economics and Sustainable Development www.iiste.org
ISSN 2222-1700 (Paper) ISSN 2222-2855 (Online)
Vol.3, No.7, 2012
Therefore, this study also attempts to investigate the causal relationship through trivariate causality. The rest of
the paper is arranged as follows. Section 2 provides the data sources. The methodology and empirical results are
presented in section 3. The final section contains the conclusions and policy recommendations.
2. Data
This study is based on annual data covering the period from 1972/73 to 2009/10. Gross Domestic Product (GDP)
has been considered to represent income (I). Data on Gross Domestic Product (GDP) and Broad Money (M)
which includes time deposits along with narrow money have been obtained from various publications of
Economic Trends, published by the Bangladesh Bank. GDP and M are expressed in terms of Taka (Domestic
Currency of Bangladesh) in Millions. To measure prices (P), the Consumer Price Index (CPI) is used which has
been collected from different issues of Statistical Yearbook of Bangladesh. Econometric estimations have been
done by using STATA 9.2.
3. Methodology and Empirical Results
The causal relationship between two variables is tested through the standard Granger (1969) causality framework
by estimating the following equations:
m n
(1 − L)Yt = α 0 + ∑ α i (1 − L)Yt −i + ∑ β j (1 − L) X t − j + ε t (1)
i =1 j =1
m n
(1 − L) X t = δ 0 + ∑ δ i (1 − L) X t −i + ∑ γ j (1 − L)Yt − j + ωt (2)
i =1 j =1
where L is the lag operator, ε and ω are mutually uncorrelated white noise series and t denotes time period.
Causality may be determined by estimating equations (1) and (2) by testing the null hypothesis that
β j = γ j = 0 for all j’s against the alternative hypothesis that β j ≠ 0 and γ j ≠ 0 for at least some j’s. If the
coefficients β j ’s are statistically significant but γ j ’s are not, then Y is said to have been caused by X. The
reverse causality holds if γ j ’s are statistically significant while β j ’s are not. If both β j and γ j are significant
then causality runs both way.
In addition to bivariate causality, this paper also attempts to examine the causal relationship through trivariate
causality i.e., the causal relationship between money and income conditional on the presence of prices. Similarly,
it tests the causal relationship between money and prices conditional on the presence of income. In order to test
the joint influence of two variables on the third variable, the joint trivariate causality model is specified as:
m n p
(1 − L)Yt = χ 0 + ∑ χ i (1 − L)Yt −i + ∑ ϕ j (1 − L) X t − j + ∑ λ k (1 − L) Z t − k +u t (3)
i =1 j =1 k =1
m n p
(1 − L) X t = λ0 + ∑ λi (1 − L) X t −i + ∑ψ j (1 − L)Yt − j + ∑ φ k (1 − L) Z t − k +vt (4)
i =1 j =1 k =1
In the trivariate specification, (i) X and Z Granger-cause Y if ϕ j = λ k = 0 is not true i.e., ϕ j = λ k = 0 is
rejected, (ii) if ψ j = φ k = 0 is rejected, Y and Z Granger-cause X. A feedback system exists if (i) – (ii) hold
simultaneously. Finally, X, Y, and Z are causally independent if all the coefficients of X and Z in equation (3), Y
and Z in equation (4) are not statistically different from zero.
The causality tests involving money, income, and prices are carried out in the following three steps. Step I
consists of identifying the order of integration of the variables under consideration. Cointegration is determined
through the maximum likelihood procedure established by Johansen (1991) in step II. In step III, we perform the
causality tests.
3.1 Testing for the Order of Integration
The econometric methodology first examines the stationarity properties of univariate time series. This is
necessary to avoid the potential problem of estimating spurious relationships. The Augmented Dickey-Fuller
83
3. Journal of Economics and Sustainable Development www.iiste.org
ISSN 2222-1700 (Paper) ISSN 2222-2855 (Online)
Vol.3, No.7, 2012
(ADF) (Dickey & Fuller, 1981) test is used for this purpose. The ADF test is derived from the regression
equation:
n
(1 − L) X t = π 0 + π 1 X t −1 + ∑ π 2 (1 − L) X t − i + et (5)
i =1
where L is the lag operator and n is the number of lags on the dependent variable. The null hypothesis is that X is
generated by a unit root process i.e. π 1 = 0. The ADF test statistic is obtained by dividing the estimate of π 1 by
its standard error. If the calculated ADF test statistic is less than the critical value (in absolute terms), the null
hypothesis of a unit root can not be rejected and the series is said to be non-stationary. The order of integration
of X is determined by conducting the ADF test on its first difference. The series will be integrated of order 1 if its
first difference does not possess a unit root. The ADF test is carried out by replacing X t with I t , M t and Pt in
equation (5) respectively. The results of the unit-root tests are reported in Table 1. The results indicate that in all
cases money (M), income (I), and prices (P) are nonstationary at their levels. Therefore to achieve stationarity,
the variables must be first-differenced. The ADF statistics are significant only for the first-differenced series.
Thus, M, I and P all appear to be I(1).
3.2 Testing for Cointegration
Cointegration test helps to identify the long-run relationship among nonstationary time series. Two or more
variables are said to be cointegrated if they are integrated of the same order. Having determined that the
variables are stationary at first differences, the Johansen cointegration test (1991) is used to examine whether the
variables in question have common trend. The, Johansen procedure assumes that Wt has a vector autoregressive
(VAR) representation such that:
Wt = δ + Π1Wt −1 + Π 2Wt − 2 + ... + Π kWt − k + ε t (6)
where δ is the intercept and εt are the disturbance terms. Equation (7) also yields:
∆Wt = δ + Γ1∆Wt −1 + Γ2 ∆Wt − 2 + ... + Γk ∆Wt − k + ε t (7)
where ∆ being the first difference operator, W is the vector of variables, δ is a drift parameter, and Γ1..........Γk
are the coefficient matrices. The number of cointegrating vectors is equal to the rank of Γk , denoted by r.
Johansen (1991) suggests two test statistics to determine the cointegration rank. The first of these is the trace
statistic:
n
λ trace ( r )
= −T ˆ
∑ ln (1 − λ ) i
(8)
i = r +1
The second test, known as the maximum eigen value test, is computed as:
λ max( r , r +1)
ˆ
= −T ln(1 − λ )
r +1
(9)
where λ i ’s are the ordered (estimated) eigen values of the matrix Γ and T is the available observations. The
null hypothesis of no cointegration i.e., r = 0 is tested against the alternative of r + 1 cointegrating vectors in
trace and maximum eigen values tests.
The results of the Johansen’s maximum likelihood method for determining the number of cointegrating vectors
are summarized in Table 2. The number of lags (i.e., two) is chosen by Akaike information criterion (AIC).
Concerning the relationship between money-income and money-prices, the null hypothesis of no cointegration is
rejected using either statistics. However, the null hypothesis of at most one cointegrating vector cannot be
rejected in favour of r = 2 . Besides, the null hypothesis of no cointegration is also rejected whereas the null
hypothesis of at most two cointegrating vectors cannot be rejected in favour of r = 3 regarding the relationship
among money, income, and prices. Thus, the empirical support for one and two cointegrating vectors implies
that the variables money- income, money-prices and money-income- prices are cointegrated and have a long-run
relationship.
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Vol.3, No.7, 2012
3.3 The Causality Tests
As the variables turn out to be cointegrated, the lagged values of the residuals ( η t −1 , η t′−1 , µ t −1 , µ t′−1 ) obtained
from the cointegrating regressions are used as error correction terms to amend the standard Granger test. The
bivariate and trivariate tests are specified as generalized extensions of the standard case (Granger, 1969) as
follows:
m n
(1 − L)Yt = α 0 + ρ1η t −1 + ∑ α i (1 − L)Yt −i + ∑ β j (1 − L) X t − j + ε t (10)
i =1 j =1
m n
(1 − L) X t = δ 0 + ρ 2η t′−1 + ∑ δ i (1 − L) X t −i + ∑ γ j (1 − L)Yt − j + ωt (11)
i =1 j =1
m n p
(1 − L)Yt = χ 0 + σ 1 µ t −1 + ∑ χ i (1 − L)Yt −i + ∑ ϕ j (1 − L) X t − j + ∑ λ k (1 − L) Z t − k +u t (12)
i =1 j =1 k =1
m n p
(1 − L) X t = λ0 + σ 2 µ t′−1 + ∑ λi (1 − L) X t −i + ∑ψ j (1 − L)Yt − j + ∑ φ k (1 − L) Z t − k +v t′ (13)
i =1 j =1 k =1
For the bivariate as well as the trivariate analysis, the F- value is calculated as:
2 2
( RUR − R R ) / l
F= 2
(14)
(1 − RUR ) /( n − q )
2 2
where RUR and RR are obtained from the unrestricted and restricted causality regressions respectively, n is the
total number of observations, l is the number of lagged terms of the variables which are chosen by Akaike’s
Information Criterion (AIC), and q is the number of parameters estimated in the unrestricted regression.
The findings of the bivariate analysis are presented in Table 3(a). These results show bidirectional causality
between money and income. Thus, due to the mixed direction of causation found between money and income, it
is difficult either to accept or reject the Keynesians or the Monetarists view in Bangladesh. Regarding, money-
price relationship, the results suggest a unidirectional causality from money to price supporting the Monetarists.
An increase in the money supply increases the price level which does not in turn cause the money supply to
increase. This implies that monetary expansion increase inflation in Bangladesh. Finally, the causal relationship
is also examined on the basis of trivariate causality. In view of the presence of a long-run relationship among
money, income, and prices, Table 3(b) shows the causal relationship between money and income conditional on
the presence of prices. Similarly, it shows the causal relationship between money and prices conditional on the
presence of income. The results are similar to those found in the bivariate case, i.e., bidirectional causality
between money and income and a unidirectional causality from money to prices conditional on the presence of
prices and income respectively.
4. Conclusions and Policy Recommendations
The objective of this paper has been to examine the causal relationship between money-income and money-
prices in Bangladesh over the period 1972/73 to 2009/10. Cointegration analysis suggests a long-run relationship
between money and the other variables i.e., income and prices. Based on the Error Correction Model (ECM), the
bivariate analysis indicates a bidirectional causality between money and income and a unidirectional causality
from money to prices. This implies that an increase in money supply raises the general price level. Therefore, it
is money that takes lead in increasing inflation in Bangladesh. The absence of bidirectional causality between
money and prices indicate that money supply can be considered as exogenous which can be taken as an effective
control variable. However, these results may be inaccurate if relevant variable(s) are omitted. The trivariate
analysis also confirms the results obtained from the bivariate case.
In view of the causal effect of money over income and prices, a number of policy implications can be inferred.
An increase in money supply leads to an increase in income which ultimately increases the demand for money to
finance higher level of economic activity. However, this also increases the price level resulting in inflation. A
higher level of income without inflation may be achieved if the growth rate of money supply is fixed roughly at a
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Vol.3, No.7, 2012
rate equal to the growth rate of the economy. Thus, if a policy objective is to achieve a high rate of economic
growth as well as restrain inflation, money supply should be considered as the most suitable target. Moreover, in
view of the bidirectional causal relationship between money and income, monetary policy should be devised by
considering the feedback effects of output on money (Mehrara & Musai, 2011).
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Vol.3, No.7, 2012
Table 1
Unit Root Test with ADF for the period 1972/73 to 2009/10
ADF ADF
Variables C First Difference C, T First Difference
I 2.184 (2) 2.681 (2)* 2.676 (2) 4.406 (2)***
M 1.392 (2) -3.621 (1)** 2.584 (2) 4.831 (2)***
P 3.008 (1) 2.754 (1)* 1.665 (1) 3.658 (1)**
Notes: i) Figures within parentheses indicate lag terms chosen by the Akaike information criterion (AIC); ii)
***, ** and * denote rejection of the null hypothesis of unit root at the 1%, 5% and 10% levels respectively; iii)
C = constant term included in the unit root test, C,T = constant and trend term included in unit root test.
Table 2
Johansen’s Maximum Likelihood Procedure
Variables Hypotheses Test Statistics
Null Alternative Trace λ - Max
r=0 r=1 15.97** 15.97**
(M,I)
r≤1 r=2 2.65 3.16
r=0 r=1 19.61** 19.26***
(M, P)
r≤1 r=2 0.36 0.36
r=0 r =1 29.68** 25.52***
(M, I, P)
r≤1 r=2 6.61 6.49
r≤2 r=3 0.12 0.12
Notes: i) r denotes the number of cointegrating vectors; ii) *** and ** denote rejection of the null
hypothesis at the 1% and 5% levels respectively.
Table 3 (a)
Bivariate Analysis of Causal Relationship between Money (M) - Income (I) and Money (M) - Prices (P)
for the period 1972/73 to 2009/10
Causation M→ I I→ M M→P P→M
F – Values 7.54*** 7.38*** 8.83*** 1.57
Notes: (i) Critical F-Values: 1% = 5.34, 5% = 3.29, 10% = 2.48, df = (2, 32); (ii) *** indicates a
significant causal relationship at the 1% level; (iii) M→ I: M causes I; (iv) I→ M: I causes M;
(v) M→P: M causes P; (vi) P→M: P causes M.
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Vol.3, No.7, 2012
Table 3 (b)
Trivariate Analysis of Causal Relationship among Money (M), Income (I), and Prices (P) for the period 1972/73
to 2009/10
Causation M(P) → I I(P) → M M(I) → P P(I) → M
F – Values 4.57** 3.16* 5.12** 2.26
Notes: (i) Critical F-Values: 1% = 5.39, 5% = 3.32, 10% = 2.49 , df = (2, 30); (ii) ** and * indicate a significant
causal relationship at the 5%, and 10% levels respectively; (iii) M(P) → I: M and P jointly cause I after including P
in the unrestricted regression; (iv) I(P) → M: I and P jointly cause M after including P in the unrestricted regression;
(v) M(I)→P: M and I jointly cause P after including I in the unrestricted regression; (vi) P(I)→M: P and I jointly
cause M after including I in the unrestricted regression.
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