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Volume 12 Issue 2, April-June 2024 

ISSN: 2836-9416 

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THE NEXUS BETWEEN BUDGET DEFICIT AND EXCHANGE 

RATE UNIFICATION IN NIGERIA 

 
1Okereke Samuel Felix, 2Onyia Chinedu Callistus and 3Agada Aloysius Ezike 

1Department of Economics and Development Studies, Federal University of Dutsin-Ma, Katsina State, 

Nigeria.   

2Department of Banking and Finance, Enugu State University of Science and Technology Enugu State, 

Nigeria.  
 3Department of Business Administration, Cosmopolitan International Business School, Abuja, 

Nigeria.   

*Corresponding Author: chinedu.onyia@esut,edu.ng *2 

DOI: https://doi.org/ 10.5281/zenodo.11085310 

 

Abstract: The paper examined the effect of exchange rate unification on budget deficit in Nigeria. 

Using time series data from secondary sources covering the period 1981 and 2022 and the ARDL 

bound test technique, the study found evidence of a long-run equilibrium relationship between 

budget deficit and the official exchange rate. The estimated unrestricted ARDL error correction 

model revealed that current official exchange rate which served as the unified exchange rate in the 

paper has a negative but insignificant effect on budget deficit. However, one period lagged (past) 

value of official exchange rate exert a negative influence on budget deficit in Nigeria. Implying that 

increase in past official exchange rate (depreciation of domestic currency) compounded the problem 

of budget deficit in Nigeria. The paper found that budget deficit in Nigeria is higher during years the 

country practiced multiple exchange rate than periods of single (unified) exchange rate system. The 

study, recommended the need to encourage more local productions to curb importation of goods 

that can be easily produced locally. This can start with policy reforms in power, infrastructure, 

taxes, etc, to improve the manufacturing sector and local production making it competitive. This 

will reduce the demand for dollars especially in the black market by importers in a bid to import 

goods, and boost revenue to the economy. 

Keywords: Official exchange rate, budget deficit, ARDL bound test. 

 

1. INTRODUCTION 

Governments, both in developed and developing nations, engage in numerous activities and offer 

diverse services to their citizens through budget allocations. These services encompass economic and 

social infrastructure provision, defense, law enforcement, establishment of pension schemes, and 

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more. The degree of government involvement in service provision varies over time and across regions, 

influenced by the prevailing political and economic ideologies within a society, as well as its evolving 

needs and aspirations (Abeng & Alehile, 2012). This collective performance constitutes the fiscal 

behavior of the government, a concept characterized by the dual process of allocating expenditures 

while simultaneously generating revenues to finance them. Hence, the government's fiscal behavior is 

encapsulated by its revenue and expenditure plans, which form the core components of its budgetary 

framework. However, when expenditures surpass revenues, it results in fiscal deficits (Aladejare, 

2014). 

This fiscal conduct aligns with the principles outlined by Keynes in 1936, suggesting that augmenting 

government spending and/or reducing taxes are effective means of attaining broader macroeconomic 

goals such as robust economic growth, minimal inflation, low unemployment rates, and a robust 

balance of payments position. These objectives are achieved by stimulating aggregate demand and 

investment. In the context of developing nations like Nigeria, escalating government expenditures 

have become a recurring feature in annual budgetary schemes, resulting in persistent budget deficits. 

This trend represents a significant developmental hurdle in Nigeria's fiscal landscape (World Bank, 

2022)  

Available statistics shows that the percentage share of budget deficit/surplus to GDP and the 

corresponding average official exchange rate (₦/US$) from 1981 to 2021 in Nigeria. Statistics from 

the (Central Bank of Nigeria, 2022) depicts that percentage share of budget deficit to GDP stood at -

2.8% in 1981, -6.1% in 1991, -2.7% in 2001, -1.8% in 2011 and -4.1% in 2021, while the average official 

exchange rate (₦/US$) stood at 0.61 in 1981, 9.91 in 1991, 111.95 in 2001, 153.86 in 2011 and 425.9 in 

2021, (CBN, 2022). Thus, during this period, Nigeria has witnessed 38 years of budget deficits, with 

only 2 years of surplus fiscal operations, and this has persisted alongside dual exchange rates, thereby 

causing untold hardship to many Nigerians, (Wosowei 2013). Budget deficits have been blamed 

mostly for much of the economic crisis in the Nigerian economy for many years resulting in debt 

crisis, poor economic performance, and foreign exchange problems (Ezeabasili, et al, 2012). As a 

result, the current administration in Nigeria is hinged on exchange rate unification amidst rising fiscal 

deficit. 

The dual exchange rate system which also allows both fixed and floating rates in the market was 

adopted in Nigeria in September, 1986, and this has been in place till 2023, (CBN, 2021). In June, 

2023, the Central Bank of Nigeria came up with a policy to unify the multiple exchange rates into a 

single exchange rate system, with transactions to hold on investors and exporters (I&E) window. The 

dual exchange rates have had several adverse effects on Nigeria’s economy, it has created economic 

distortions of which individuals and businesses engage in speculative activities and also take advantage 

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of the rate differentials to make profits, (CBN, 2023). These practices have resulted in an inefficient 

allocation of resources and hindered economic growth.  

However, there exists a divergence of opinions regarding the impact of exchange rate unification on 

budget deficits. One perspective argues that over time, unifying the exchange rate could result in the 

government's foreign exchange revenue surpassing its foreign currency obligations. Onyekpere 

(2023) suggests that exchange rate unification would ensure that any foreign exchange income 

received by the government would now be monetized at the new unified rate, which is significantly 

higher than the previous rate sanctioned by the Central Bank of Nigeria. This would consequently 

increase the resources available to the government for developmental initiatives. Moreover, the 

resources previously allocated to subsidize those who obtained foreign exchange at the CBN-imposed 

rate would no longer be expended on wasteful expenditure. 

Conversely, other scholars such as Ozili (2024) argue that the unification of the exchange rate could 

elevate the naira value of foreign debts, as both federal and state governments rely on borrowing from 

foreign creditors to finance their budgetary requirements. Consequently, governments would need to 

allocate more naira to service or repay these debts. The implication of exchange rate unification is that 

in Nigeria, being an import-dependent economy, the cost of goods and services imported into the 

country, previously funded at the lower exchange rate, would now escalate due to the increased naira 

requirement for imports. This scenario is likely to instigate an inflationary spiral effect (Gray 2021; 

Sanusi, 2010). 

Nevertheless, the country do not have an immediate source of increasing foreign exchange supply 

considering the backlog of unmet foreign exchange demand and associated obligations as well as 

estimates of future foreign exchange demand for the years ahead. Therefore, there is the danger of the 

market facilitating a free fall of the naira which will depreciate the currency to an unimaginable level 

leading to price instability, inflation and uncertainty in the economy, (Ozili, 2024). 

Although, the issue of budget deficit has been a thorn in the flesh of policy makers in the country, but 

part of the perennial policy challenges facing Nigeria, are multiple exchange rates and the free fall of 

the Naira and how to control it. The challenge of having multiple exchange rates amidst currency 

depreciation has both monetary and fiscal policy implications. Fiscal deficit may be unavoidable in 

the developmental process; however, it is the level, magnitude and the tendency to stabilize the value 

of the Naira that have galvanized empirical assessment of the relationship between fiscal deficits and 

exchange rate unification, (Oladipo and Akinbobola, 2011). 

From the foregoing, the study aimed at investigating the following objectives. i. Examine if budget 

deficit differ between period of dual exchange rate system and that of single exchange rate system. ii. 

Investigate the impact of the official exchange rate on budget deficit. Following the introduction, the 

rest of the paper is structured as follows. Section 2 deals with the literature review. Methodology is 

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covered in Section 3. The estimated results and discussion are dealt with in Section 4. The paper is 

concluded in Section 5 

2. LITERATURE REVIEW 

2.1 Theoretical Literature 

2.1.1 The Keynesian theory 

Keynesian theory suggests that a budget deficit will have a positive influence on an economy’s real 

growth rate (Keynes 1936). This fiscal behaviour is in line with the theory of (Keynes 1936), opined 

that increased government spending and/or cutting taxes are instrumental tools to achieving the 

overall macroeconomic objectives of high economic growth rate, low inflation, low unemployment 

rate as well as a virile balance of payments position through increased aggregate demand and 

investment, (Sabr, Ahmed & Khan 2021). 

2.1.2 The Mundell-Fleming Model 

The Mundell-Fleming model, devised by Robert Mundell (1968) and Marcus Fleming (1967), extends 

the Investment Savings – Liquidity Preference Money Supply (IS-LM) model. This model illustrates 

the short-term dynamics in a small open economy, interrelating the nominal exchange rate, interest 

rate, and output. It posits a direct link between the budget deficit and current account deficit, with 

causation from the former to the latter (Sanni, Gaiya, Ipinjolu, Aliyu, & Okafor, 2022). According to 

the model, an increase in the budget deficit boosts domestic absorption and aggregate demand, 

exerting upward pressure on domestic interest rates compared to global rates (Sanni, et al., 2022). 

Consequently, the elevated domestic interest rates attract foreign capital inflows, leading to increased 

demand for domestic currency and currency appreciation. This, in turn, raises the cost of domestic 

goods relative to foreign goods, thereby expanding the trade deficit (Onafowokan & Owoye, 2006). 

2.2 Empirical Literature 

Eldepcy (2022) explored the causal relationship between different methods of financing budget 

deficits and the real exchange rate in Egypt over the period 1975 to 2020. Employing the Structural 

Vector Autoregressive (SVAR) technique with a variable lag structure, the study revealed that the 

money supply ratio to GDP significantly influenced fluctuations in the real exchange rate in the short 

and medium terms. Additionally, the study found that non-bank financing, as indicated by the real 

interest rate, played a minor role in these fluctuations, suggesting an increasing reliance on local bank 

financing for budget deficit funding during the study period. Furthermore, the analysis revealed a 

substantial reliance on local sources, particularly local bank financing, to cover the budget deficit. 

Domestic non-banking sources showed comparatively less influence on real exchange rate 

fluctuations and, consequently, on the value of the Egyptian pound relative to the US dollar.  

Sanni, Gaiya, Ipinjolu, Aliyu, and Okafor (2022) examined the role of exchange rate in Nigeria's twin 

deficits hypothesis from 1981 to 2019. Employing the ARDL model for data analysis, the study 

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uncovered a bidirectional causal relationship between the current account deficit and fiscal deficit. 

Furthermore, it was found that there exists a positive correlation between the current account balance 

and fiscal balance during periods of both exchange rate appreciation and depreciation, both in the 

short and long terms. These findings solidify the significance of the exchange rate in the twin deficits 

hypothesis within the Nigerian context. 

Sabr, Ahmed & Khan (2021) explored the impact of budget deficits on economic growth in Iraq 

spanning from 1980 to 2018. Utilizing the Autoregressive Distributed Lag (ARDL) model for 

regression analysis, the findings indicated a positive short-term influence of budget deficits on 

economic growth, contrasting with a negative long-term impact. 

Ayinde & Bankole (2021) scrutinized fiscal dominance and exchange rate stability in Nigeria, utilizing 

quarterly data from the first quarter of 1981 to the fourth quarter of 2018. Employing the Structural 

Vector Autoregression (SVAR) technique, the study aimed to analyze the study's objective and 

examine the shock transmission effects of budget deficit and public debt on exchange rate movements 

in Nigeria. Additionally, the study employed the Autoregressive Distributed Lag (ARDL) model for a 

robust test to analyze the shock transmission effects of fiscal dominance components on exchange 

rate movements in Nigeria. Granger causality tests were also conducted to trace the direction of 

causality among fiscal deficit components and exchange rates. Results revealed a bi-directional causal 

relationship between budget deficits and changes in exchange rates in Nigeria, while public debt did 

not Granger cause exchange rate movements. Structural Vector Autoregression estimations suggested 

that exchange rate movements in Nigeria responded solely to the shock effects of financial openness, 

while ARDL results revealed that both public debt and budget deficits had destabilizing effects on 

exchange rates in Nigeria. 

Nwosa (2017) examined the relationship between fiscal policy and exchange rate movements in 

Nigeria for the period 1980 to 2015. Employing Ordinary Least Squares (OLS), the study found that 

fiscal policy variables were statistically significant in influencing exchange rates in Nigeria. This 

implies that fiscal policy variables play a significant role in determining exchange rate movements in 

Nigeria. Consequently, the study recommended prudent management of revenue, expenditure, and 

debt to reduce exchange rate depreciation and ensure exchange rate stability. 

Sanusi and Akinlo (2016) explored the potential presence of fiscal dominance in Nigeria spanning 

from 1986 to 2013, employing structural VAR analysis. The study's findings indicated that shocks to 

government fiscal deficits did not elicit a response from the growth of the monetary base. 

Furthermore, the results revealed the absence of causality running from fiscal deficits to the growth of 

the monetary base in Nigeria. As a conclusion, the study inferred that there was no evidence of fiscal 

dominance in Nigeria during the investigated period. 

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Osuka and Achinihu (2014) investigated whether a long-run relationship exists between budget 

deficits and other macroeconomic variables in Nigeria over the period 1981-2012. The macroeconomic 

variables considered were gross domestic product (GDP), interest rate, nominal exchange rate, and 

inflation rate. Employing the Granger Causality test, the study's findings unveiled a unidirectional 

Granger-causality between budget deficits and GDP, with GDP Granger-causing budget deficits. 

However, the test for causality revealed no causality between deficits and interest rate, budget deficits 

and inflation, and budget deficits and nominal exchange rate. 

Virkola (2014) examined the effects of discretionary fiscal policy shocks under various exchange rate 

regimes, utilizing a structural vector autoregressive (SVAR) model. The study disclosed that 

discretionary fiscal policy exhibits greater effectiveness under a fixed exchange rate regime compared 

to a floating exchange rate regime. Additionally, the study's results indicated evidence that 

unanticipated fiscal policy shocks have a larger expansionary effect on output than in the baseline 

scenario. 

This study tried to unravel if there is a strong and statistical relationship between budget deficit and 

exchange rate unification in Nigeria. However, this study will deviate from other studies that have 

mainly examined the impact of budget deficit on exchange rate by examining the effect of using the 

official exchange rate on budget deficit in Nigeria. The study also used a dummy as a fixed regressor 

dividing exchange rate periods (assigned as 1) and single exchange rate periods (assigned as 0) into 

multiple exchange rate periods – (assigned 1) and single exchange rate period –(assigned 0), to 

examine how budget deficit responds to the periods in Nigeria. This is different from studies that have 

mostly used the real exchange rate without assigning such fixed regressor. Moreover, the study 

treatment of the subject matter differs from past studies with a sample which comprises broad 

longitudinal data set spanning 1981-2022. This is because this period produced bouts of large fiscal 

deficits and mixture of single and multiple exchange rate systems. The study period also corresponds 

to and witnessed regimes of economic reforms in Nigeria.  

3. METHODOLOGY 
3.1. Data Sources and Description of Variables  
The study uses time series annual data covering the period 1981–2022, obtained from the Central 
bank of Nigeria statistical bulletin (CBN, 2022). The dependent variable is the ratio of budget deficit 
to GDP, the independent variables are official exchange rate (Naira per US Dollar) - the official 
exchange rate is used to represent exchange rate unification, growth rate of GDP, trade to GDP ratio, 
debt service to GDP ratio and a dummy variable indicating periods of dual exchange rate system and 
period of single exchange rate system. 
3.2. Model Specification and Estimation Procedure  
In other to capture the effect of exchange rate unification on budget deficit in Nigeria, the study 
adopted a modified form of the model of (Eldepcy, 2022) and is specified as:  
BDEFt = β0 +β1DUM+β2EXCH+β3TOP+ β4GDPGR + µt                                     (1)  

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Where BDEF represents budget deficit; DUM stands for dummy representing exchange rate system – 
1 for years of dual system and 0 for years of single system. EXCH denotes official real exchange rate; 
TOP represents trade to GDP ratio (trade openness); GDPGR denotes growth rate of GDP (a control 
variable); and µ - the error term, respectively. A priori, favourable exchange rate will decrease the 
budget deficit, while an unfavourable exchange rate will increase the deficit.  
The study adopted the autoregressive distributed lag (hereafter ARDL) bounds testing approach 
(Pesaran et al., 2001) for the analysis of the data in Nigeria. One of the advantages of the ARDL 
model, according to (Iyoboyi, Okereke & Musa-Pedro, 2018) is that it does not require pre-testing the 
variables. However, it is important to make sure that the variables are not integrated of order 2, which 
violates the use of the ARDL technique, (Iyoboyi, Okereke & Musa-Pedro, 2018). This necessitated the 
test for stationarity of the series using the Augmented Dickey Fuller (ADF). Thus, the ARDL model of 
the specification in Equation 1 is presented as follows:  

∆BDEFt = β0 + 


n

i 1

β1i∆BDEFt-1 + 


n

i 1

β2i∆EXCHt-1 +


n

i 1

β3i∆TOPt-1 + 


n

i 1

 β4i∆GDPGRt-1 + β5iDUMt+ 

µ            (2) 
Where n is the lag length. The unrestricted error correction model arising from Equation 2 is specified 
as follows: 

∆BDEFt = β0 + 


n

i 1

β1i∆BDEFt-1 + 


n

i 1

β2i∆EXCHt-1 +


n

i 1

β3i∆TOPt-1 + 


n

i 1

 β4i∆GDPGRt-1 + β5iDUMt+ 

δ1BDEFt-1 + δ2EXCHt-1 + δ3TOPt-1 + δ4GDPGRt-1 + β6ECMt-1+ µ   (3) 
Where the parameters βi = 1, 2,…,4 are the short-run dynamic coefficients, the parameters δi = 1, 2,…, 
4 are the long-run multipliers, and ECM denotes the speed of adjustment. The tests confirming the 
reliability of the estimations in the study include the goodness-of-fit, the joint significance of the 
independent variables, serial correlation, and tests for heteroskedasticity, specification error (bias), 
and stability. 
4. RESULTS AND DISCUSSION 

Table 1: Unit root test results 
Source: Authors’ computations 

Variables      Augmented Dickey Fuller                     Phillips Perron 
levels Test stat.                5% critical values test stat.                 5% critical values 

Bdeficit -1.909574 -1.949097 -1.913185 -1.949097 
Exch 4.716190 -1.949097 5.211985 -1.949097 
Openes -2.397300 -2.935001 -2.397300             -2.935001 

GDPGR -3.203694 -2.936942 -4.333019 -2.935001 
1st difference 
ΔBdeficit -7.010574 -1.949319 -6.978945 -1.949319 
ΔExch -4.211353 -2.936942 -4.125444 -2.936942 
ΔOpenes -5.148831 -3.557759 -9.268690 -1.949319 

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From table 1, the hypothesis of no unit root is rejected for budget deficit, exchange rate, and trade 
openness at levels but accepted for growth rate of GDP. Thus, budget deficit, exchange rate, and trade 
openness have a unit root using both the ADF and PP unit root test techniques and thus are integrated 
of order 1. This implies that budget deficit, exchange rate, and trade openness are I(1) variables while 
growth rate of GDP is I(0) variable, which necessitated the adoption of the ARDL technique and the 
bound test for cointegration. To avoid spurious regression, the test of cointegration was conducted 
and the results shown in table 2. 
Table 2: Cointegration Test Result 
Test statistics                              value                                             k 

F-statistics                              4.543206                                          3 
Critical bound values 
Significance (%)                          lower bound                                       upper bound 
10                                                        2.37                                                  3.2 
5                                                          2.79                                                  3.67 
1             3.65                                                  4.66 

Source: Authors’ computations 
The hypothesis of no cointegration is strongly rejected for the series as shown from from Table 2; the 
computed F-statistics (4.54) is higher than the upper bounds of the critical values at the 5% level of 
significance, respectively. The results suggest that there exists a long-run relationship between budget 
deficit and the independent variables employed in the study. Thus, the bound test indicates a long-run 
equilibrium relationship. The estimated short-run effect of adopting the official exchange rate as a 
unified one and other independent variables on budget deficit is presented in table 3 
Table 3: Short Run ARDL estimated coefficients 

Variable  Coefficient       Std. Error  t-Statistic   P-value  
∆CDEF(-1) 0.548560***   0.116536  4.707223 0.0001 
∆EXCH -0.006075   0.009123 -0.665840 0.5116 
∆EXCH(-1) 0.035947***   0.009608 3.741228 0.0010 
∆OPNES -0.074105***   0.021204 -3.494927 0.0018 
∆OPNES(-1) -0.041852*   0.021535 -1.943481 0.0633 
∆OPNES(-2) -0.062911***   0.020397 -3.084300 0.0049 
∆OPNES(-3) -0.045188**  0.019596 -2.305998 0.0297 
∆GDPGR 0.014112  0.040888  0.345133 0.7329 
∆DUMMY -0.847607**  0.295989 -2.863647 0.0084 
ECM(-1) -0.451440***  0.087944 -5.133283 0.0000 

Diagnostics Test 

R2                              0.608346 

DW:                   2.20747 
BG - LM Test:   1.269827(0.5300) 
BPG Test:          12.41963(0.4126) 
J-B Test:             2.450821 (0.293637) 

Source: Authors’ computations 

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4.2 Discussion of Results 
One period lagged value of budget deficit has a statistically significant positive impact on budget 
deficit at the 5% significant level. This means that past levels of budget deficit tend to contribute to 
the current level of budget deficit in Nigeria, which is expected; given that the deficit accumulates 
unless it is cleared. Current official exchange rate (unified exchange rate) has no significant effect on 
budget deficit at the 5% level, but has negative relationship with budget deficit. However, and one 
period-lagged coefficients of official exchange rate exert a negative influence on budget deficit in 
Nigeria. Thus, a one unit rise in past official exchange rate (depreciation of domestic currency) leads 
to 0.03 increases in budget deficit in Nigeria. Increase in past official exchange rate has been 
contributing to increase in budget deficit which could be attributed to the dual exchange rate 
practiced in these past periods. 
As shown in table 3, current values of trade openness and past trade openness all have significant 
negative effect on budget deficit. This is consistent with a priori expectation. Thus, higher openness 
to trade will have a decrease in official exchange rate (appreciation of domestic currency). A unit rise 
in trade openness is associated with approximately 0.074 decrease in exchange rate. The fixed 
regressor which is the dummy variable representing periods of single and dual exchange rate practices 
is negative and significant. Given that the coefficient of the dummy is negative, it means that the 
country suffered more budget deficit during periods of dual exchange rate than periods of single 
(unified) exchange rate system. 
The speed of adjustment (ECM) is correctly signed and significant at 5% level, which affirms the 

existence of cointegration between budget deficit and exchange rate unification and alongside other 

variables employed in the study. The speed of adjustment is low (approximately 45%). The post-

estimation diagnostics indicate that about 61% variation in budget deficit is accounted for by changes 

in the independent variables used in the study. The F-statistic indicates that all the regressors 

employed in the study are jointly statistically significant at 5% in explaining changes in budget deficit. 

The ARDL requires the lagged of the dependent variable appears as regression in the model, 

necessitated the interpretation of the Breusch-Godfrey (BG) statistic for the test of autocorrelation. 

From the estimated results in Table 2, the null hypothesis of no serial autocorrelation is accepted, 

given the non-statistically significant value of the BG test. Moreover, the residuals in the estimated 

model are normally distributed, as shown by the JB test statistic which is not statistically significant. 

Also, the residuals are homoscedastic, as shown by the non-significant BPG test result; in addition the 

model passes the test for specification bias as indicated by the RESET test statistic. 

4.3 Stability Tests  

Testing the stability of the estimated model, the paper used the cumulative sum of recursive 

(CUSUM) and the cumulative sum of the squares of recursive residuals (CUSUMSQ). The results are 

presented graphically in Figures 1 and 2.  

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-15

-10

-5

0

5

10

15

98 00 02 04 06 08 10 12 14 16 18 20 22

CUSUM 5% Significance  
Figure1: The cumulative sum of recursive (CUSUM) 

-0.4

-0.2

0.0

0.2

0.4

0.6

0.8

1.0

1.2

1.4

98 00 02 04 06 08 10 12 14 16 18 20 22

CUSUM of Squares 5% Significance  
Figure2: The cumulative sum of the squares of recursive residuals (CUSUMSQ) 

Figures 1 and 2 indicate that the curves do not cross the 5% critical lines, implying that the estimated 

coefficients within the period covered in the study are stable. Thus, meaning that the estimated 

parameters are stable and consistent. Thus, the empirical results would be reliable for policy 

recommendation and base on the findings of this paper, the paper made the following 

recommendations.  

The study revealed that Nigeria experienced higher budget deficits during periods characterized by 

multiple exchange rate regimes compared to times when a single, unified exchange rate system was in 

place. Consequently, there is a pressing need to promote local manufacturing to reduce reliance on 

imported goods that could be domestically produced. Initiating structural reforms in areas such as 

power, infrastructure, and taxation is crucial to enhance the competitiveness of the manufacturing 

sector. This strategy would diminish the demand for foreign currency, particularly in the informal 

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(black) market, as importers seek to import goods. Ultimately, such measures would augment revenue 

for the economy and reduce budget deficit. 

Furthermore, the research identified that a one-period lag in the exchange rate had a detrimental 

impact on Nigeria's budget deficit, suggesting that the existence of multiple exchange rates may have 

undermined investor confidence. Therefore, Nigeria requires a substantial influx of foreign currency 

into the official foreign exchange market to fulfill the demand for foreign currency. Encouraging 

efforts to unify the exchange rate is imperative to attract foreign investors to Nigeria, thereby injecting 

foreign currency into the market and ultimately generating revenue that could alleviate deficits in the 

economy. 

5. CONCLUSIONS  

The paper examined the effect of exchange rate unification on budget deficit in Nigeria. Using time 

series data from secondary sources covering the period 1981 and 2022 and the ARDL bound test 

technique, the study found evidence of a long-run equilibrium relationship between budget deficit 

and the official exchange rate. The estimated unrestricted ARDL error correction model revealed that 

current official exchange rate which served as the unified exchange rate in the paper has a negative 

but insignificant effect on budget deficit. However, one period lagged (past) value of official exchange 

rate exert a negative influence on budget deficit in Nigeria. Implying that increase in past official 

exchange rate (depreciation of domestic currency) compounded the problem of budget deficit in 

Nigeria.  

Also, the country suffered more budget deficit during periods of dual exchange rate than periods of 

single (unified) exchange rate system. Based on the results, there is the need to unify the exchange 

rate in Nigeria and attract the needed appreciation and loss of revenue if the country is poised 

towards reduction of budget deficit experienced in the country. 

REFERENCES 

Abeng, M. O and Alehile, K. S (2012), Macroeconomic Shocks and Fiscal Deficit Behaviour in Nigeria: 

A VECM Approach. Central Bank of Nigeria Economic and Financial Review.  50 (1): 27-

58. 

Aladejare, S. A (2014), Evaluation of government income-spending hypothesis nexus in Nigeria: 

Application of the bound test approach. American journal of business, economics and 

management; 2(1): 28-40. 

Ayinde, T. O. & Bankole, A. S. (2021). Fiscal dominance and exchange rate stability in Nigeria. Future 

Business Journal, 7(1)34:1-15. 

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American Research Journal of Economics, Finance and Management 

Volume 12 Issue 2, April-June 2024 

ISSN: 2836-9416 

Impact Factor: 5.57 

Journal Homepage: https://americaserial.com/Journals/index.php/ARJEFM, 

Email: contact@americaserial.com 

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Central Bank of Nigeria (2023). Operational Changes to the Foreign Exchange Market, Central  Bank 

of Nigeria publication. Available 

at https://www.cbn.gov.ng/Out/2023/CCD/Operational%20Changes%20to%20FX%20Marke

t.pdf. 

Eldepcy, M. A. (2022). The budget deficit financing impact on the real exchange rate in Egypt  (1975-

2020). International journal of economics and finance, 14(3): 84-99. 

Ezeabasili V.N, Mojekwu J.N and Herbert W.E, (2012). An empirical analysis of fiscal deficits  and 

inflation in Nigeria. International Business and Management. 4(1): 105-120. 

Fleming, J. M. (1962). Domestic financial policies under fixed and under floating exchange  rates. 

Staff Papers, 9(3), 369-380. 

Gray, M. S. T. (2021). Recognizing Reality-Unification of Official and Parallel Market  Exchange 

Rates. International Monetary Fund (IMF) Working Papers, WP/21/25 

Mundell, R. (1968). Inflation and real interest. Journal of Political Economy, 71(3), 280- 283.  

Nwosa, P. I. (2017). Fiscal Policy and Exchange Rate Movement in Nigeria.  Acta Universitatis 

Danubius. Œconomica, 13(3): 115-127 

Oladipo, S. O. and Akinbobola, T. O. (2011) Budget Deficit and Inflation in Nigeria: A  Causal 

Relationship.  Journal of Emerging Trends in Economics and Management Sciences 

 (JETEMS) 2 (1): 1-8. 

Onafowokan, O. A., & Owoye, O. (2006). An empirical investigation of budget and trade  deficits: The 

case of Nigeria. Journal of Developing Areas, 39(2), 153- 174.  

Osuka, B. O and Achinihu, J.C (2014), The Impact Of Budget Deficits On Macro-Economic Variables 

In The Nigerian Economy (1981 – 2012). International Journal for Innovation  Education 

and Research,2(11). 

Ozili, P.K. (2024). Exchange Rate Unification in Nigeria: Benefits and Implications. Recent 

Developments in Financial Management and Economics. IGI Global. 

Pesaran, M. H., Shin, Y. & Smith, R. (2001). Bound testing approaches to the analysis of level 

relationship. Journal of Applied Econometrics, 16(3), 289-326. 

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https://www.cbn.gov.ng/Out/2023/CCD/Operational%20Changes%20to%20FX%20Market.pdf
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ISSN: 2836-9416 

Impact Factor: 5.57 

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Email: contact@americaserial.com 

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Sabr, S. G., Ahmed, Y. A. & Khan, T. M. N. (2021). Government Budget Deficit and Economic Growth: 

Evidence from Iraq 1980-2018. Arab Journal of Administration, 41(1): 227-242. 

Sanni, G. K., Gaiya, B. A., Ipinjolu, O. A., Aliyu, V. O., and Okafor, S. N. (2022). Twin Deficits  in 

Nigeria: Where Does the Exchange Rate Fit? Central Bank of Nigeria Economic and 

 Financial Review 60(1): 67-91. 

Sanusi, A. R. (2010). Successful Exchange Rate Unification in a High Inflation Environment: Lessons 

from the Ghanaian Economic Reforms of 1983-2006. Abuja Journal of  Administration and 

Management, 7(2). 

Sanusi, K. A & Akinlo, A. E. (2016) Investigating Fiscal Dominance in Nigeria. Journal of Sustainable 

Development; 9(1): 125-131. 

Virkola, T. (2014). Exchange Rate Regime, Fiscal Foresight and the Effectiveness of Fiscal  Policy 

in a Small Open Economy. ETLA Reports No 20. http://pub.etla.fi/ETLA- Raportit-Reports-

20.pdf 

World Bank Group (2022) Nigeria Development Update, December 2022. Available 

at https://thedocs.worldbank.org/en/doc/74e2f8585c426106f79f30a7b5fbc8790360012022/o

riginal/World-Bank-Nigeria-Development-Update-december-2022 

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