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Journal of Economics and Sustainable Development www.iiste.org
ISSN 2222-1700 (Paper) ISSN 2222-2855 (Online)
Vol.5, No.14, 2014
138
Empirical Analysis of Money Demand Stability in Nigeria
Osmond N. Okonkwo1
* Emmanuel I. Ajudua2
Sunny T. Alozie3
1. Department of Economics, Alvan Ikoku Federal College of Education, Owerri.
2. Department of Economics, Faculty of Social Sciences, Imo State University. Owerri.
3. Department Of Banking & Finance, Imo State Polytechnic, Umuagwo, Imo State.
* E-mail of the corresponding author: osmond.okonkwo@gmail.com
Abstract
The main focus of this study is to identify the variables influencing the demand for money in Nigeria; and to
ascertain the stability of money demand in Nigeria. Related theories and empirical researches in this area were
reviewed in order to ensure the relevance of variables under study and possible expectation of their relationship
with money - demand in Nigeria. Four explanatory variables were specified for this study based on theoretical
underpinning. Stationarity test were conducted and all variables were stationary at first difference, with two
cointegrating equations after using the Johansen Cointegration test. The error correction model (ECM) was
rightly signed and revealed a recovery rate of 18 percent. It was also recommended among others that the
monetary policy strategy of the CBN should be structured to deal with the growing challenges posed by financial
innovations. The stability test revealed that M2 money demand in Nigeria is stable using both CUSUM and
CUSUMSQ at 5 percent critical lines.
Keywords: Money-Demand, Non-Bank Financial Institutions, Speculative demand for money, Liquidity,
cointegration.
1. Introduction
The demand for money as seen by economists is the desired holding of financial assets in the form of money;
either as cash or bank demand deposits. Money demand is found to be a major determinant of liquidity. Its
stability guarantees predictability of interest rates, output, and inflation. The search for stability of the demand
for money has received great attention as an understanding of its causes and consequences give useful insight
into the formulation of monetary policy.
Demand for money stability is important for both macroeconomic modeling and monetary policy. In the case of
stability, Poole (1970), argued that the rate of interest should be targeted if liquidity preference is unstable while
money supply should be targeted if the investment savings relationship is unstable and the demand for money is
unstable.
The Central Bank in an economy operates to achieve the stability and control of the demand for money through
her monetary policy instrument, so as to have a forecastable influence on output, interest rate and prices
(Sriresun 1999). This is so because a stable money demand function contributes to a broader economic growth
and rising standard of living. In countries where the Central Bank targets monetary aggregate, for instance, using
reserve money to implement monetary policy, the effectiveness of monetary policy rests mainly on the stability
of the monetary transmission mechanism as well as velocity of money. When this relationship is subjected to
unexpected fluctuations, monetary targets lose their relevance and are less able to signal the appropriate stance of
monetary policy. This argument has been used as a reason for moving to inflation targeting which uses range of
information to assess the monetary policy stance (Dagher and Kovanen 2011).
The Central Bank of Nigeria since the Structural Adjustment Programme (SAP) of 1986, have aimed at
controlling money demand through interest rate using her monetary policy instruments. In this regard, the
Central Bank of Nigeria maintains price stability by assigning more weight to the longer term relationship
between money growth and inflation. This emphasis reflects in the CBN’s view that inflation is a monetary
phenomenon and price stability enhances the potential for economic growth (Rao & Kumar, 2007)
The main focus of this study is to identify the variables influencing the demand for money in Nigeria; ascertain
the stability of money demand in Nigeria, and provide explanation to the relationship between money demand
and monetary policy in Nigeria.
By 1988, SAP had started taking its toll on the Nigerian economy as high inflation rate, structural
unemployment, decline in productivity, high interest rate, and low capacity utilization rate have become a
general feature of the economy. Corruption and embezzlement of funds and resources made it difficult for the
monetary authority to forecast and control money demand, thus unpredictability and fluctuations in the demand
for money (Aiyegbedon, et al, 2013).
2. Literature Review
The demand for money has been taken to refer to an economy's medium of exchange; it is generally accepted in
payment for goods and services. Thus, real cash balance is primarily the determinant of the demand for money.
Journal of Economics and Sustainable Development www.iiste.org
ISSN 2222-1700 (Paper) ISSN 2222-2855 (Online)
Vol.5, No.14, 2014
139
The notion of money demand came forth in the 'cash balance' approach of the Cambridge economist. They
presumed that the quantity of money demanded would depend primarily on the volume of transaction to be
taken, but emphasized volition on the part of money holders and recognized that the ratio of real balances to
transaction volume would be affected by forgone 'investment income' i.e. interest earning, (Ahuja 2013).
Money is necessary to carry out transactions; in other words, it provides liquidity. This creates a trade-off
between the liquidity advantage of holding money and the interest advantage of holding other assets. The
demand for money is a result of this trade-off regarding the form in which a person's wealth should be held.
2.1. Theoretical framework
Keynes in his study postulated three motives for the demand for money: transactions, precautionary and
speculative motives, laying out speculative reasons for holding money, stressed the choice between money and
bonds. If economic agents expect the future nominal interest rate (the return on bonds) to be lower than the
current rate they will then reduce their holdings of money and increase their holdings of bonds. If the future
interest rate does fall, then the price of bonds will increase and the agents will have realized a capital gain on the
bonds they purchased. This means that the demand for money in any period will depend on both the current
nominal interest rate and the expected future interest rate in addition to the transaction and precautionary motives
which depend on income.
The demand for money according Friedman is influenced by the same factors that influence the demand for any
asset; Friedman applied the theory of asset demand to the demand for money. This indicates that the demand for
money is the function of the resources available to individuals and the expected returns on other assets relative to
the expected return on money. Friedman included not only the level of income and rate of interest on bonds but
also rates of return on other assets such as equity, durable goods including real property. Friedman’s theory of
money demand can be written as follows: Md
= f(P, Y, rb, re, rd). Where Md
is money demand; P is price level; Y
is real income; rb is interest on bond; re is return on equity and rd is return on durable goods. For Friedman money
demand function is stable. Stability of money demand function implies that it will not shift erratically and that
variables in the function will determine the quantity of money that will be demanded. Friedman’s demand for
money can also be rewritten as follows: Md
= k(rb, re, rd) PY. Where k is now taken to be a function of rates of
return on alternative non-monetary assets and PY is the nominal income.
For monetary policy to be effective, money demand function must be stable. With the Gurley and Shaw
hypothesis, liquidity is totally unaccountable for by the monetary authority as the Non-bank Financial
Institutions (NBFI) provide liquidity and safety to financial assets and help in transferring funds from ultimate
lenders to ultimate borrowers for productive purpose (Nwaru, 2014). If the Central bank tries to control liquidity
in the economy through reduction in money supply, the success rate becomes hampered as deposits of NBFI’s
can be easily converted into cash.
Economic theories posit a close relationship between money balances, income and opportunity cost variables.
According to Friedman (1970), demand for money is a function of interest rate, income and the general utility of
holding money. Other studies like Frenkel (1977) did not only emphasize expected inflation rate as a determinant
of demand for money but also variables like real income. They postulated that an increase in the cost of holding
money, through the interest or declining purchasing power of money because of inflation leads to a decline in
demand for real money balance. In an inflationary economy, money loses its store of value function thus,
demand increase for low inflation currency. Hence it is suggested by Civcir (2003) that portfolio theory may be
more appropriate in the analysis of money demand in high inflation economies.
2.2. Empirical Framework
Empirical studies of money demand have tended to converge to a specification where demand for real money
balance is a function of scale variables- income or expenditure, rate of return of money, the opportunity cost of
holding money (domestic interest rate and/or expected rate of inflation). The inclusion of expected rate of
inflation has been emphasized especially for developing countries where given the existence of underdeveloped
monetary and financial system and non-market determined interest rate, physical assets represent one of the
major hedges against inflation and an alternative asset in the portfolio of non-bank public (Rao and Kumar
2007).
According to Adam (1999), demand for money lies at the heart of macroeconomic policies. This is so because
money either cash or interest bearing bonds, remains the most liquid and important financial asset held by the
non-bank private sector. The quantity of money demanded in any economy indeed will depend upon prevailing
institution (including Non-bank Financial Institution as seen by Gurley and Shaw), and technology.
Bahamani-Oskooee and Barry (2000), investigated the stability of the M2 money demand function in Russia.
They found evidence of cointegration between the series in the system. While the plot of the cumulative sum of
Journal of Economics and Sustainable Development www.iiste.org
ISSN 2222-1700 (Paper) ISSN 2222-2855 (Online)
Vol.5, No.14, 2014
140
recursive residuals (CUSUM) provided evidence of stability, the plot of the cumulative sum of squares of
recursive residuals (CUSUMSQ), on the other hand, revealed that M2 money demand function is not stable. Al-
Samara (2011), in his study in the analysis of money demand function in Syria found that real money demand
M2 and its determinants are weakly cointegrated. On the other hand, stability test and error correction model
have provided a support that money demand function is unstable in the Syrian economy, and this instability
could be due to structural changes in the function. These findings support the choice of exchange rate as a
nominal anchor for Syrian monetary policy to tie down the price level and achieve its stability.
Nell (1999) empirically evaluated the existence of a stable long-run demand for money function in South Africa
over the period 1965-1997; given that after the adoption of money market-oriented monetary policy measures in
1980, South Africa Reserve Bank primarily relied on setting predetermined growth targets for M3. The empirical
results suggest that M3 was stable while M1 and M2 display parameter instability. This suggests that M3 money
stock could serve as an indicator for monetary policy for South Africa. Adam (1992) successfully established a
series of single equation demand for money functions (M0, M1, M2 and M3) for the Kenyan economy from 1973
to 1989. Application of the Johansen technique suggested that income elasticities of money demand were around
unity for M0 and slightly lower at around 0.8 for the other monetary aggregates; therefore he found that the
demand for M1 is stable.
Nwaobi (2002) and Nwafor, Nwakanma, Nkasah and Thopmson (2007) examined the stability of money demand
for Nigeria using vector autoregression approach. Their results confirmed a stable money demand function for
Nigeria. Akinlo (2006) using an autoregressive distributed lag (ARDL) technique combined with CUSUM and
CUSUMQ tests, examined the cointegrating property and stability of broad (M2) money demand in Nigeria. The
results show M2 to be cointegrated with income, interest rate and exchange rate. The CUSUM test weakly
reported a stable money demand for Nigeria. Omotor (2009) also applied the ARDL technique and equally found
a stable money demand for Nigeria.
Anoruo (2002) explored the stability of the M2 money demand function in Nigeria in the SAP period and his
results from the Johansen and Juselius (1990) cointegration test suggested that real discount rate, economic
activity and real M2, are cointegrated. His CUSUM and CUSUMSQ stability test results indicated that the M2
money demand function in Nigeria is stable for the study period. The results of the study showed that M2 is a
viable monetary policy tool that could be used to stimulate economic activity in Nigeria. Omotor and Omotor
(2011), estimated an endogenous structural break date of the money demand for Nigeria for the period 1960-
2008. Using the Gregory and Hansen (2007) procedure, an endogenous break date of 1994 was estimated for the
cointegrating equation of the demand for money. The study also joins previous ones to affirm a stable money
demand function for Nigeria and established that the CBN has effectively used money supply as a monetary
policy instrument.
3. Methodology
In Keynes’ motives of holding money, transaction and precautionary motives of holding money is direct function
of income, while speculative motive of holding money is an inverse function of interest rate. Friedman gave
further insight by seeing inflation as a factor to be considered in the demand for real money balances.
As a result of globalization, the exchange rate becomes an important variable in the demand for money. An
increase in expected foreign interest rate would stimulate the desire to hold more foreign assets in the economy
leading to reduction in the holding of real money balances in the economy. Thus, foreign exchange is inversely
related to the demand to hold real cash balances. Thus, in this study, broad money demand ( )is expressed as
the function of GDP (as a proxy income), interest rate (INT), inflation rate (INF), and exchange rate (EXR).
Thus, = F (GDP, INT, INF, EXR)
Therefore = + + 	INT + INF + EXR + µ
Where Md = money balances, GDP= Gross Domestic Product, INT = Interest rate, INF = Inflation rate, EXR
= Exchange rate, µ = error term, t = time trend. The a priori expectations for the coefficients are as follows:
β1>0; β2, β3, β4 <0.
4. Analysis of Results and Discussion of Findings
4.1. Testing for Stationarity
In order to avoid spurious regression and conclusions drawn thereto, it became imperative to ensure that the
parameters are estimated using stationary time series data. As a result, this study adopted the Augmented Dikky
– Fuller (ADF) test. The ADF test statistic outcome of the time series data for the period, 1981 – 2012 shows that
all-time series data are stationary at first difference at 1% critical level. See table below.
Journal of Economics and Sustainable Development www.iiste.org
ISSN 2222-1700 (Paper) ISSN 2222-2855 (Online)
Vol.5, No.14, 2014
141
Table 1: Augmented Dickey-Fuller test statistic
t - statistic Critical values 1% Critical values 5% Critical values 10% Prob.
D(Md) 9.784095 -4.416345 -3.622033 -3.248592 1.0000
D(GDP) -6.355288 -4.296729 -3.568379 -3.218382 0.0001
D(INT) -6.235813 -3.679322 -2.967767 -2.622989 0.0000
D(INF) -5.508498 -4.296729 -3.568379 -3.218382 0.0005
D(EXR) -5.224880 -3.670170 -2.963972 -2.621007 0.0002
4.2. Testing for Cointegration
Table 2: Johansen Cointegration Test
From the table above the trace statistics 83.67957 and 50.53312 exceed the critical values of 69.81889 and
47.85613 respectively at 1 percent and 5 percent confidence intervals respectively. Hence, we reject the null
hypothesis and conclude that there are at least two cointegrating relationships and therefore, a long run
relationship exists among the variables.
Date: 06/17/14 Time: 16:34
Sample (adjusted): 1983 2012
Included observations: 30 after adjustments
Trend assumption: Linear deterministic trend
Series: MD GDP INT INF EXR
Lags interval (in first differences): 1 to 1
Unrestricted Cointegration Rank Test (Trace)
Hypothesized Trace 0.05
No. of CE(s) Eigenvalue Statistic Critical Value Prob.**
None * 0.668750 83.67957 69.81889 0.0026
At most 1 * 0.576760 50.53312 47.85613 0.0274
At most 2 0.468458 24.73865 29.79707 0.1710
At most 3 0.174315 5.779454 15.49471 0.7214
At most 4 0.001105 0.033180 3.841466 0.8554
Trace test indicates 2 cointegrating eqn(s) at the 0.05 level
* denotes rejection of the hypothesis at the 0.05 level
**MacKinnon-Haug-Michelis (1999) p-values
Journal of Economics and Sustainable Development www.iiste.org
ISSN 2222-1700 (Paper) ISSN 2222-2855 (Online)
Vol.5, No.14, 2014
142
4.3. Error Correction Model
Table 2: Error Correction Model
Dependent Variable: D(MD)
Method: Least Squares
Date: 06/18/14 Time: 09:03
Sample (adjusted): 1986 2012
Included observations: 27 after adjustments
Variable Coefficient Std. Error t-Statistic Prob.
C 58072.89 188287.6 0.308427 0.7641
D(GDP) 0.029545 0.067274 0.439175 0.6699
D(GDP(-2)) 0.157393 0.050319 3.127912 0.0107*
D(GDP(-3)) 0.491363 0.083493 5.885045 0.0002*
D(INT) -22331.07 37101.82 -0.601886 0.5606
D(INT(-1)) -65542.38 47881.13 -1.368856 0.2010
D(INT(-3)) 90504.15 31924.53 2.834940 0.0177**
D(INT(-4)) 57493.27 27732.30 2.073152 0.0649***
D(INF) -4438.932 10226.14 -0.434077 0.6734
D(INF(-1)) -9401.379 7135.972 -1.317463 0.2171
D(INF(-2)) -5959.046 9823.326 -0.606622 0.5576
D(INF(-3)) -21461.89 14544.75 -1.475576 0.1708
D(INF(-4)) -23504.90 11489.43 -2.045785 0.0680***
D(EXR) -14606.41 7584.431 -1.925841 0.0830***
D(EXR(-1)) -16018.07 14444.41 -1.108946 0.2934
D(EXR(-2)) -12016.66 6699.393 -1.793694 0.1031
ECM(-1) -0.178688 0.208583 -0.856674 0.4117
R-squared 0.939071 Mean dependent var 572502.6
Adjusted R-squared 0.841586 S.D. dependent var 854933.2
S.E. of regression 340274.6 Akaike info criterion 28.57890
Sum squared resid 1.16E+12 Schwarz criterion 29.39480
Log likelihood -368.8152 Hannan-Quinn criter. 28.82151
F-statistic 9.632906 Durbin-Watson stat 2.012399
Prob(F-statistic) 0.000463
* denotes rejection of the hypothesis at the 0.01 level
** denotes rejection of the hypothesis at the 0.05 level
*** denotes rejection of the hypothesis at the 0.1 level
From the result of the error correction model estimation above, the parameters are all rightly signed. National
income (GDP), interest rate (INT), and inflation (INF) are not significant at current values with coefficients and
t-statistics in bracket as follows; 0.029545 (0.439175), -22331.07 (-0.601886), and -4438.932 (-0.434077)
respectively. However, the lags of these variables are significant 1 percent, 5 percent and 10 percent
respectively. While there exists significant inverse relationship between money demand and exchange rate at 10
percent critical value. The ECM was rightly signed with the economy recovery rate of 18 percent. The R-squared
showed that 94 percent variation in the demand for money in Nigeria is explained by the explanatory variables.
The study also revealed that the Durbin Watson statistic of 2.01 fall within the range of 1.50 – 2.40 of no serial
correlation.
4.4. Test of Stability
The test of stability in figures 1 and 2 below showed that neither the CUSUM nor CUSUMSQ plots cross the 5
percent critical lines, therefore, one can safely conclude that the estimated parameters for the study are stable and
useful for policy decision. In other words, with the explanatory variables (GDP, interest rate, inflation and
exchange rate) money demand function in Nigeria is stable. This means that the monetary authority can use M2
to control the level of liquidity preference in Nigeria no matter the level of external transactions.
Journal of Economics and Sustainable Development www.iiste.org
ISSN 2222-1700 (Paper) ISSN 2222-2855 (Online)
Vol.5, No.14, 2014
143
Figure 1: Plot of Cumulative Sum of Recursive Residuals
Figure 2: Plot of Cumulative Sum of Squares of Recursive Residuals
5. Conclusion
The study's objective was to ascertain the stability of the demand for money and the influence of monetary
policies using monetary instruments in controlling the demand for money. The results obtained conformed to a
priori expectation for income, interest rate, inflation and exchange rate. However, only exchange rate (at current
value) was significant at 10 percent level of significance. Thus as pointed out by Gurley and Shaw, the activities
of Non-Bank Financial Institutions (NBFI) in providing liquidity and raising interest rate for their own benefit
run contrary to CBN's monetary policy in controlling the stability of money demand. The NBFI make tight
monetary policy less successful and expansionary monetary policy ineffective by injecting and withdrawing
liquidity respectively.
One of the empirical aspects of the study which involves test of stability showed that real money demand
function in Nigeria is stable as neither the CUSUM nor the CUSUMSQ plots cross the 5 percent critical
boundaries. Thus, liquidity can be managed by the CBN to achieve a targeted range of macroeconomic stability
in Nigeria
-10.0
-7.5
-5.0
-2.5
0.0
2.5
5.0
7.5
10.0
2003 2004 2005 2006 2007 2008 2009 2010 2011 2012
CUSUM 5% Significance
-0.4
0.0
0.4
0.8
1.2
1.6
2003 2004 2005 2006 2007 2008 2009 2010 2011 2012
CUSUM of Squares 5% Significance
Journal of Economics and Sustainable Development www.iiste.org
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Vol.5, No.14, 2014
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5.1 Recommendations
1. The monetary policy strategy of the CBN should be to reduce the frivolous charges by the money
deposit money banks in Nigeria in order to stimulate deposits and discourage the increasing apathy of
the Nigerian public.
2. The monetary policy strategy of the CBN should also be structured to deal with the growing challenges
posed by financial innovation.
3. A policy of attracting and checking non-government participant and private sector fund in the money
market is necessary; and a stringent method to check the availability of more than required liquidity
by individuals through withdrawal of deposits should be instituted by the CBN on commercial banks.
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Empirical analysis of money demand stability in nigeria

  • 1. Journal of Economics and Sustainable Development www.iiste.org ISSN 2222-1700 (Paper) ISSN 2222-2855 (Online) Vol.5, No.14, 2014 138 Empirical Analysis of Money Demand Stability in Nigeria Osmond N. Okonkwo1 * Emmanuel I. Ajudua2 Sunny T. Alozie3 1. Department of Economics, Alvan Ikoku Federal College of Education, Owerri. 2. Department of Economics, Faculty of Social Sciences, Imo State University. Owerri. 3. Department Of Banking & Finance, Imo State Polytechnic, Umuagwo, Imo State. * E-mail of the corresponding author: osmond.okonkwo@gmail.com Abstract The main focus of this study is to identify the variables influencing the demand for money in Nigeria; and to ascertain the stability of money demand in Nigeria. Related theories and empirical researches in this area were reviewed in order to ensure the relevance of variables under study and possible expectation of their relationship with money - demand in Nigeria. Four explanatory variables were specified for this study based on theoretical underpinning. Stationarity test were conducted and all variables were stationary at first difference, with two cointegrating equations after using the Johansen Cointegration test. The error correction model (ECM) was rightly signed and revealed a recovery rate of 18 percent. It was also recommended among others that the monetary policy strategy of the CBN should be structured to deal with the growing challenges posed by financial innovations. The stability test revealed that M2 money demand in Nigeria is stable using both CUSUM and CUSUMSQ at 5 percent critical lines. Keywords: Money-Demand, Non-Bank Financial Institutions, Speculative demand for money, Liquidity, cointegration. 1. Introduction The demand for money as seen by economists is the desired holding of financial assets in the form of money; either as cash or bank demand deposits. Money demand is found to be a major determinant of liquidity. Its stability guarantees predictability of interest rates, output, and inflation. The search for stability of the demand for money has received great attention as an understanding of its causes and consequences give useful insight into the formulation of monetary policy. Demand for money stability is important for both macroeconomic modeling and monetary policy. In the case of stability, Poole (1970), argued that the rate of interest should be targeted if liquidity preference is unstable while money supply should be targeted if the investment savings relationship is unstable and the demand for money is unstable. The Central Bank in an economy operates to achieve the stability and control of the demand for money through her monetary policy instrument, so as to have a forecastable influence on output, interest rate and prices (Sriresun 1999). This is so because a stable money demand function contributes to a broader economic growth and rising standard of living. In countries where the Central Bank targets monetary aggregate, for instance, using reserve money to implement monetary policy, the effectiveness of monetary policy rests mainly on the stability of the monetary transmission mechanism as well as velocity of money. When this relationship is subjected to unexpected fluctuations, monetary targets lose their relevance and are less able to signal the appropriate stance of monetary policy. This argument has been used as a reason for moving to inflation targeting which uses range of information to assess the monetary policy stance (Dagher and Kovanen 2011). The Central Bank of Nigeria since the Structural Adjustment Programme (SAP) of 1986, have aimed at controlling money demand through interest rate using her monetary policy instruments. In this regard, the Central Bank of Nigeria maintains price stability by assigning more weight to the longer term relationship between money growth and inflation. This emphasis reflects in the CBN’s view that inflation is a monetary phenomenon and price stability enhances the potential for economic growth (Rao & Kumar, 2007) The main focus of this study is to identify the variables influencing the demand for money in Nigeria; ascertain the stability of money demand in Nigeria, and provide explanation to the relationship between money demand and monetary policy in Nigeria. By 1988, SAP had started taking its toll on the Nigerian economy as high inflation rate, structural unemployment, decline in productivity, high interest rate, and low capacity utilization rate have become a general feature of the economy. Corruption and embezzlement of funds and resources made it difficult for the monetary authority to forecast and control money demand, thus unpredictability and fluctuations in the demand for money (Aiyegbedon, et al, 2013). 2. Literature Review The demand for money has been taken to refer to an economy's medium of exchange; it is generally accepted in payment for goods and services. Thus, real cash balance is primarily the determinant of the demand for money.
  • 2. Journal of Economics and Sustainable Development www.iiste.org ISSN 2222-1700 (Paper) ISSN 2222-2855 (Online) Vol.5, No.14, 2014 139 The notion of money demand came forth in the 'cash balance' approach of the Cambridge economist. They presumed that the quantity of money demanded would depend primarily on the volume of transaction to be taken, but emphasized volition on the part of money holders and recognized that the ratio of real balances to transaction volume would be affected by forgone 'investment income' i.e. interest earning, (Ahuja 2013). Money is necessary to carry out transactions; in other words, it provides liquidity. This creates a trade-off between the liquidity advantage of holding money and the interest advantage of holding other assets. The demand for money is a result of this trade-off regarding the form in which a person's wealth should be held. 2.1. Theoretical framework Keynes in his study postulated three motives for the demand for money: transactions, precautionary and speculative motives, laying out speculative reasons for holding money, stressed the choice between money and bonds. If economic agents expect the future nominal interest rate (the return on bonds) to be lower than the current rate they will then reduce their holdings of money and increase their holdings of bonds. If the future interest rate does fall, then the price of bonds will increase and the agents will have realized a capital gain on the bonds they purchased. This means that the demand for money in any period will depend on both the current nominal interest rate and the expected future interest rate in addition to the transaction and precautionary motives which depend on income. The demand for money according Friedman is influenced by the same factors that influence the demand for any asset; Friedman applied the theory of asset demand to the demand for money. This indicates that the demand for money is the function of the resources available to individuals and the expected returns on other assets relative to the expected return on money. Friedman included not only the level of income and rate of interest on bonds but also rates of return on other assets such as equity, durable goods including real property. Friedman’s theory of money demand can be written as follows: Md = f(P, Y, rb, re, rd). Where Md is money demand; P is price level; Y is real income; rb is interest on bond; re is return on equity and rd is return on durable goods. For Friedman money demand function is stable. Stability of money demand function implies that it will not shift erratically and that variables in the function will determine the quantity of money that will be demanded. Friedman’s demand for money can also be rewritten as follows: Md = k(rb, re, rd) PY. Where k is now taken to be a function of rates of return on alternative non-monetary assets and PY is the nominal income. For monetary policy to be effective, money demand function must be stable. With the Gurley and Shaw hypothesis, liquidity is totally unaccountable for by the monetary authority as the Non-bank Financial Institutions (NBFI) provide liquidity and safety to financial assets and help in transferring funds from ultimate lenders to ultimate borrowers for productive purpose (Nwaru, 2014). If the Central bank tries to control liquidity in the economy through reduction in money supply, the success rate becomes hampered as deposits of NBFI’s can be easily converted into cash. Economic theories posit a close relationship between money balances, income and opportunity cost variables. According to Friedman (1970), demand for money is a function of interest rate, income and the general utility of holding money. Other studies like Frenkel (1977) did not only emphasize expected inflation rate as a determinant of demand for money but also variables like real income. They postulated that an increase in the cost of holding money, through the interest or declining purchasing power of money because of inflation leads to a decline in demand for real money balance. In an inflationary economy, money loses its store of value function thus, demand increase for low inflation currency. Hence it is suggested by Civcir (2003) that portfolio theory may be more appropriate in the analysis of money demand in high inflation economies. 2.2. Empirical Framework Empirical studies of money demand have tended to converge to a specification where demand for real money balance is a function of scale variables- income or expenditure, rate of return of money, the opportunity cost of holding money (domestic interest rate and/or expected rate of inflation). The inclusion of expected rate of inflation has been emphasized especially for developing countries where given the existence of underdeveloped monetary and financial system and non-market determined interest rate, physical assets represent one of the major hedges against inflation and an alternative asset in the portfolio of non-bank public (Rao and Kumar 2007). According to Adam (1999), demand for money lies at the heart of macroeconomic policies. This is so because money either cash or interest bearing bonds, remains the most liquid and important financial asset held by the non-bank private sector. The quantity of money demanded in any economy indeed will depend upon prevailing institution (including Non-bank Financial Institution as seen by Gurley and Shaw), and technology. Bahamani-Oskooee and Barry (2000), investigated the stability of the M2 money demand function in Russia. They found evidence of cointegration between the series in the system. While the plot of the cumulative sum of
  • 3. Journal of Economics and Sustainable Development www.iiste.org ISSN 2222-1700 (Paper) ISSN 2222-2855 (Online) Vol.5, No.14, 2014 140 recursive residuals (CUSUM) provided evidence of stability, the plot of the cumulative sum of squares of recursive residuals (CUSUMSQ), on the other hand, revealed that M2 money demand function is not stable. Al- Samara (2011), in his study in the analysis of money demand function in Syria found that real money demand M2 and its determinants are weakly cointegrated. On the other hand, stability test and error correction model have provided a support that money demand function is unstable in the Syrian economy, and this instability could be due to structural changes in the function. These findings support the choice of exchange rate as a nominal anchor for Syrian monetary policy to tie down the price level and achieve its stability. Nell (1999) empirically evaluated the existence of a stable long-run demand for money function in South Africa over the period 1965-1997; given that after the adoption of money market-oriented monetary policy measures in 1980, South Africa Reserve Bank primarily relied on setting predetermined growth targets for M3. The empirical results suggest that M3 was stable while M1 and M2 display parameter instability. This suggests that M3 money stock could serve as an indicator for monetary policy for South Africa. Adam (1992) successfully established a series of single equation demand for money functions (M0, M1, M2 and M3) for the Kenyan economy from 1973 to 1989. Application of the Johansen technique suggested that income elasticities of money demand were around unity for M0 and slightly lower at around 0.8 for the other monetary aggregates; therefore he found that the demand for M1 is stable. Nwaobi (2002) and Nwafor, Nwakanma, Nkasah and Thopmson (2007) examined the stability of money demand for Nigeria using vector autoregression approach. Their results confirmed a stable money demand function for Nigeria. Akinlo (2006) using an autoregressive distributed lag (ARDL) technique combined with CUSUM and CUSUMQ tests, examined the cointegrating property and stability of broad (M2) money demand in Nigeria. The results show M2 to be cointegrated with income, interest rate and exchange rate. The CUSUM test weakly reported a stable money demand for Nigeria. Omotor (2009) also applied the ARDL technique and equally found a stable money demand for Nigeria. Anoruo (2002) explored the stability of the M2 money demand function in Nigeria in the SAP period and his results from the Johansen and Juselius (1990) cointegration test suggested that real discount rate, economic activity and real M2, are cointegrated. His CUSUM and CUSUMSQ stability test results indicated that the M2 money demand function in Nigeria is stable for the study period. The results of the study showed that M2 is a viable monetary policy tool that could be used to stimulate economic activity in Nigeria. Omotor and Omotor (2011), estimated an endogenous structural break date of the money demand for Nigeria for the period 1960- 2008. Using the Gregory and Hansen (2007) procedure, an endogenous break date of 1994 was estimated for the cointegrating equation of the demand for money. The study also joins previous ones to affirm a stable money demand function for Nigeria and established that the CBN has effectively used money supply as a monetary policy instrument. 3. Methodology In Keynes’ motives of holding money, transaction and precautionary motives of holding money is direct function of income, while speculative motive of holding money is an inverse function of interest rate. Friedman gave further insight by seeing inflation as a factor to be considered in the demand for real money balances. As a result of globalization, the exchange rate becomes an important variable in the demand for money. An increase in expected foreign interest rate would stimulate the desire to hold more foreign assets in the economy leading to reduction in the holding of real money balances in the economy. Thus, foreign exchange is inversely related to the demand to hold real cash balances. Thus, in this study, broad money demand ( )is expressed as the function of GDP (as a proxy income), interest rate (INT), inflation rate (INF), and exchange rate (EXR). Thus, = F (GDP, INT, INF, EXR) Therefore = + + INT + INF + EXR + µ Where Md = money balances, GDP= Gross Domestic Product, INT = Interest rate, INF = Inflation rate, EXR = Exchange rate, µ = error term, t = time trend. The a priori expectations for the coefficients are as follows: β1>0; β2, β3, β4 <0. 4. Analysis of Results and Discussion of Findings 4.1. Testing for Stationarity In order to avoid spurious regression and conclusions drawn thereto, it became imperative to ensure that the parameters are estimated using stationary time series data. As a result, this study adopted the Augmented Dikky – Fuller (ADF) test. The ADF test statistic outcome of the time series data for the period, 1981 – 2012 shows that all-time series data are stationary at first difference at 1% critical level. See table below.
  • 4. Journal of Economics and Sustainable Development www.iiste.org ISSN 2222-1700 (Paper) ISSN 2222-2855 (Online) Vol.5, No.14, 2014 141 Table 1: Augmented Dickey-Fuller test statistic t - statistic Critical values 1% Critical values 5% Critical values 10% Prob. D(Md) 9.784095 -4.416345 -3.622033 -3.248592 1.0000 D(GDP) -6.355288 -4.296729 -3.568379 -3.218382 0.0001 D(INT) -6.235813 -3.679322 -2.967767 -2.622989 0.0000 D(INF) -5.508498 -4.296729 -3.568379 -3.218382 0.0005 D(EXR) -5.224880 -3.670170 -2.963972 -2.621007 0.0002 4.2. Testing for Cointegration Table 2: Johansen Cointegration Test From the table above the trace statistics 83.67957 and 50.53312 exceed the critical values of 69.81889 and 47.85613 respectively at 1 percent and 5 percent confidence intervals respectively. Hence, we reject the null hypothesis and conclude that there are at least two cointegrating relationships and therefore, a long run relationship exists among the variables. Date: 06/17/14 Time: 16:34 Sample (adjusted): 1983 2012 Included observations: 30 after adjustments Trend assumption: Linear deterministic trend Series: MD GDP INT INF EXR Lags interval (in first differences): 1 to 1 Unrestricted Cointegration Rank Test (Trace) Hypothesized Trace 0.05 No. of CE(s) Eigenvalue Statistic Critical Value Prob.** None * 0.668750 83.67957 69.81889 0.0026 At most 1 * 0.576760 50.53312 47.85613 0.0274 At most 2 0.468458 24.73865 29.79707 0.1710 At most 3 0.174315 5.779454 15.49471 0.7214 At most 4 0.001105 0.033180 3.841466 0.8554 Trace test indicates 2 cointegrating eqn(s) at the 0.05 level * denotes rejection of the hypothesis at the 0.05 level **MacKinnon-Haug-Michelis (1999) p-values
  • 5. Journal of Economics and Sustainable Development www.iiste.org ISSN 2222-1700 (Paper) ISSN 2222-2855 (Online) Vol.5, No.14, 2014 142 4.3. Error Correction Model Table 2: Error Correction Model Dependent Variable: D(MD) Method: Least Squares Date: 06/18/14 Time: 09:03 Sample (adjusted): 1986 2012 Included observations: 27 after adjustments Variable Coefficient Std. Error t-Statistic Prob. C 58072.89 188287.6 0.308427 0.7641 D(GDP) 0.029545 0.067274 0.439175 0.6699 D(GDP(-2)) 0.157393 0.050319 3.127912 0.0107* D(GDP(-3)) 0.491363 0.083493 5.885045 0.0002* D(INT) -22331.07 37101.82 -0.601886 0.5606 D(INT(-1)) -65542.38 47881.13 -1.368856 0.2010 D(INT(-3)) 90504.15 31924.53 2.834940 0.0177** D(INT(-4)) 57493.27 27732.30 2.073152 0.0649*** D(INF) -4438.932 10226.14 -0.434077 0.6734 D(INF(-1)) -9401.379 7135.972 -1.317463 0.2171 D(INF(-2)) -5959.046 9823.326 -0.606622 0.5576 D(INF(-3)) -21461.89 14544.75 -1.475576 0.1708 D(INF(-4)) -23504.90 11489.43 -2.045785 0.0680*** D(EXR) -14606.41 7584.431 -1.925841 0.0830*** D(EXR(-1)) -16018.07 14444.41 -1.108946 0.2934 D(EXR(-2)) -12016.66 6699.393 -1.793694 0.1031 ECM(-1) -0.178688 0.208583 -0.856674 0.4117 R-squared 0.939071 Mean dependent var 572502.6 Adjusted R-squared 0.841586 S.D. dependent var 854933.2 S.E. of regression 340274.6 Akaike info criterion 28.57890 Sum squared resid 1.16E+12 Schwarz criterion 29.39480 Log likelihood -368.8152 Hannan-Quinn criter. 28.82151 F-statistic 9.632906 Durbin-Watson stat 2.012399 Prob(F-statistic) 0.000463 * denotes rejection of the hypothesis at the 0.01 level ** denotes rejection of the hypothesis at the 0.05 level *** denotes rejection of the hypothesis at the 0.1 level From the result of the error correction model estimation above, the parameters are all rightly signed. National income (GDP), interest rate (INT), and inflation (INF) are not significant at current values with coefficients and t-statistics in bracket as follows; 0.029545 (0.439175), -22331.07 (-0.601886), and -4438.932 (-0.434077) respectively. However, the lags of these variables are significant 1 percent, 5 percent and 10 percent respectively. While there exists significant inverse relationship between money demand and exchange rate at 10 percent critical value. The ECM was rightly signed with the economy recovery rate of 18 percent. The R-squared showed that 94 percent variation in the demand for money in Nigeria is explained by the explanatory variables. The study also revealed that the Durbin Watson statistic of 2.01 fall within the range of 1.50 – 2.40 of no serial correlation. 4.4. Test of Stability The test of stability in figures 1 and 2 below showed that neither the CUSUM nor CUSUMSQ plots cross the 5 percent critical lines, therefore, one can safely conclude that the estimated parameters for the study are stable and useful for policy decision. In other words, with the explanatory variables (GDP, interest rate, inflation and exchange rate) money demand function in Nigeria is stable. This means that the monetary authority can use M2 to control the level of liquidity preference in Nigeria no matter the level of external transactions.
  • 6. Journal of Economics and Sustainable Development www.iiste.org ISSN 2222-1700 (Paper) ISSN 2222-2855 (Online) Vol.5, No.14, 2014 143 Figure 1: Plot of Cumulative Sum of Recursive Residuals Figure 2: Plot of Cumulative Sum of Squares of Recursive Residuals 5. Conclusion The study's objective was to ascertain the stability of the demand for money and the influence of monetary policies using monetary instruments in controlling the demand for money. The results obtained conformed to a priori expectation for income, interest rate, inflation and exchange rate. However, only exchange rate (at current value) was significant at 10 percent level of significance. Thus as pointed out by Gurley and Shaw, the activities of Non-Bank Financial Institutions (NBFI) in providing liquidity and raising interest rate for their own benefit run contrary to CBN's monetary policy in controlling the stability of money demand. The NBFI make tight monetary policy less successful and expansionary monetary policy ineffective by injecting and withdrawing liquidity respectively. One of the empirical aspects of the study which involves test of stability showed that real money demand function in Nigeria is stable as neither the CUSUM nor the CUSUMSQ plots cross the 5 percent critical boundaries. Thus, liquidity can be managed by the CBN to achieve a targeted range of macroeconomic stability in Nigeria -10.0 -7.5 -5.0 -2.5 0.0 2.5 5.0 7.5 10.0 2003 2004 2005 2006 2007 2008 2009 2010 2011 2012 CUSUM 5% Significance -0.4 0.0 0.4 0.8 1.2 1.6 2003 2004 2005 2006 2007 2008 2009 2010 2011 2012 CUSUM of Squares 5% Significance
  • 7. Journal of Economics and Sustainable Development www.iiste.org ISSN 2222-1700 (Paper) ISSN 2222-2855 (Online) Vol.5, No.14, 2014 144 5.1 Recommendations 1. The monetary policy strategy of the CBN should be to reduce the frivolous charges by the money deposit money banks in Nigeria in order to stimulate deposits and discourage the increasing apathy of the Nigerian public. 2. The monetary policy strategy of the CBN should also be structured to deal with the growing challenges posed by financial innovation. 3. A policy of attracting and checking non-government participant and private sector fund in the money market is necessary; and a stringent method to check the availability of more than required liquidity by individuals through withdrawal of deposits should be instituted by the CBN on commercial banks. References Adam, C. (1992); “On the Dynamic Specification of Money Demand in Kenya”, Journal of African Economies 1, 233-270 Adam, C. (1992); “On the Dynamic Specification of Money Demand in Kenya”, Journal of African Economies 1, 233-270 Adam, C. S., P. J. Kessy, J. J. Nyella, and S. A. O’Connell (2011), The Demand for Money in Tanzania, International Growth Center, working paper 11_0336. Ahuja, H.L. (2013); “Modern Economics, S. Chand Higher Academic, 17th Revised Edition. Akinlo, A.E. (2006): “The Stability of Money Demand in Nigeria: An Autoregressive Distributed Lag Approach”. Journal of Policy Modeling. 28: pp 445-452. Al-Samara, M. (2011): “An Empirical Analysis of the Money Demand Function in Syria”. Economic Centre of Sorbonne, University of Paris-1 Panthéon-Sorbonne Anoruo, E. (2002). Stability of the Nigerian M2 Money Demand Function in the SAP period, Economics Bulletin Vol. 14 No. 3 pp. 1-9. Anoruo, E. (2002): “Stability of the Nigerian M2 Money Demand Function in the SAP Period”. Economics Bulletin, Vol. 14, No. 3 pp. 1−9. Bahmani-Oskooee, M. and Barry, M. P. (2000): "Stability of the Demand for Money in an Unstable Country: Russia,” Journal of Keynesian Economics, 22, No.4, pp619-629. Bitrus, Y. P. (2011). The Demand for Money in Nigeria, European Journal of Business and Management, Vol. 3, No. 6 CBN (2012): Central Bank of Nigeria Statistical Bulletin and Annual Report and Statement of Account Civcir, I. (2003) “Broad Money Demand and Currency substitution in Turkey”, The Journal of Developing Areas, Vol. 36, No. 2 pp127-144. Dagher, J. and A. Kovanen (2011). On the Stability of Money Demand in Ghana: A Bounds Testing Approach. International Monetary Fund, WP/11/273 Frenkel, J. (1977) “The Forward Exchange Rate, Expectations and the Demand for Money: The German Hyperinflation”, American Economic Review, September, 653-670. Friedman, M.A. (1970) “A Theoretical Framework for Monetary Analysis” Journal of Political Economy, March, 193-238. Gbosi, A.N (2005), “Fundamentals of Modern Economics” Sodek Associates, Port Harcourt Hamori, S (2008). Empirical Analysis of the Money Demand Function in Sub-Saharan Africa, Economics Bulletin, Vol. 15, No. 4, pp. 1-15. Jhingan, M.L, (2002) “Macro-economic theory, Vrinda Publication India Kumar, S., D. J. Webber, and S. Fargher (2010), Money Demand Stability: A Case of Nigeria. Munich Personal RePEc Archives Mayuku, G. J., Ogude, B. A., Ibeh, S. E. and Ohwofasa, B. O. (2012); “An Appraisal of the Impact of Bank Distress on Nigerian Economy, 1986-2010: An Empirical Investigation”. International Journal of Business and Social Science, Vol. 3 No. 24 (Special Issue), December Nduka, E.K. (2013). “Openness and Economic Growth in Nigeria” Journal of Education and Practice, Vol. 4, No. 1 pp. 68-73. Nell, K.S. (1999); The Stability of Money Demand in South Africa, 1965-1997. University of Kent at Canterbury, Department of Economics, Studies in Economics, no. 99/5. Nwaobi, G. (2002): "A Vector Error Correction and Nonnested Modeling of Money Demand Function in Nigeria," Economics Bulletin, 3, 4, 1-8. Nwaru, M. D. (2014), Lesson notes on Monetary Economics
  • 8. Journal of Economics and Sustainable Development www.iiste.org ISSN 2222-1700 (Paper) ISSN 2222-2855 (Online) Vol.5, No.14, 2014 145 Ohwofasa, B. O. and Mayuku, J. G. (2012); “Determinants of Bank Distress and Effect on Nigerian Economy, 1986- 2010: An Empirical Analysis”. European Journal of Humanities and Social Sciences, vol 17(1). www.journalsbank.com Ohwofasa, B. O. and Mayuku, J. G. (2012); “Determinants of Bank Distress and Effect on Nigerian Economy, 1986- 2010: An Empirical Analysis”. European Journal of Humanities and Social Sciences, vol 17(1). www.journalsbank.com Omotor, D. G. and Omotor, P.E. (2011): “Structural Breaks, Demand for Money and Monetary Policy in Nigeria”. www.google.com.ng Omotor, D. G. and Omotor, P.E. (2011): “Structural Breaks, Demand for Money and Monetary Policy in Nigeria”. www.google.com.ng Omotor, D.G. (2009): “Money Demand and Foreign Exchange Risk for Nigeria: A Cointegration Analysis using ARDL Test”. Processed www.google.com.ng Omotor, D.G. (2009): “Money Demand and Foreign Exchange Risk for Nigeria: A Cointegration Analysis using ARDL Test”. Processed www.google.com.ng Owoye, O. and Onafowora, O, A. (2007): “Structural Adjustment and the Stability of the Nigerian Money Demand Function”. International Business & Economics Research Journal Volume 3, Number 8 Poole, W. (1970): “The Optimal Choice of Monetary Policy Instruments in a Simple Macro Model”. Quarterly Journal of Economics 192-216 Sanusi, A. R. (2010). An Empirical Analysis of the Money Supply Process in Ghana: 1983-2006. Abuja Journal of Banking and Finance, Vol. 2, No.1 Sriram, S. S. (2001). A Survey of Recent Empirical Money Demand Studies, International Monetary Fund, Vol. 47, No. 3 Tahir, J. (1995). Recent Developments in Demand for Money Issues: Survey of Theory & Evidence with Reference to Arab Countries. Economic Research Forum. Teriba, A. O. (2006b): “Demand for M1 in Nigeria”. http://ssrn.com/abstract=874407 Teriba, O. (1974); "The Demand for Money in the Nigerian Economy: Some Methodological Issues and Further Evidence", Nigerian Journal of Economic and Social Studies, 16(1): 153-164.
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