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Effect of Public Debt on Capital Expenditure Accountability in Nigeria

Abstract

Public debt has become an increasingly important source of financing for governments seeking to bridge budget deficits, finance infrastructure development, stimulate economic growth, and support the delivery of essential public services. In Nigeria, rising public debt has attracted considerable attention due to its rapid growth, increasing debt servicing obligations, and implications for fiscal sustainability and public sector accountability. The Federal Government has relied on both domestic and external borrowing to finance capital projects in critical sectors such as transportation, energy, healthcare, education, agriculture, and water resources. While public borrowing is expected to accelerate economic development through increased investment in infrastructure and productive assets, concerns have emerged regarding the accountability, transparency, efficiency, and effectiveness of capital expenditure financed through borrowed funds. Weak project monitoring, cost overruns, abandoned projects, procurement irregularities, corruption, and inadequate public financial management practices have raised questions about whether borrowed resources are effectively translated into sustainable capital assets. Consequently, ensuring accountability in the utilization of debt-financed capital expenditure has become essential for promoting fiscal discipline, improving public confidence, and achieving sustainable national development. Although previous studies have examined the relationship between public debt and economic growth or fiscal sustainability, empirical evidence regarding the effect of public debt on capital expenditure accountability in Nigeria remains limited and inconclusive. Against this background, this study investigates the effect of public debt on capital expenditure accountability in Nigeria. The study is anchored on Public Choice Theory, Fiscal Responsibility Theory, and Agency Theory. Public Choice Theory explains that public officials may pursue borrowing and expenditure decisions that are influenced by political and institutional incentives, thereby affecting the efficient utilization of public resources. Fiscal Responsibility Theory emphasizes the importance of prudent borrowing, transparent fiscal management, and effective debt utilization in promoting sustainable public finance and accountability. Agency Theory posits that government officials, acting as agents of the public, have a responsibility to manage borrowed funds efficiently and transparently to achieve intended developmental objectives while minimizing agency problems arising from information asymmetry and weak oversight. Collectively, these theoretical perspectives provide a comprehensive framework for explaining the relationship between public debt and capital expenditure accountability in Nigeria. The study adopts an ex post facto research design utilizing secondary data obtained from the Debt Management Office (DMO), the Central Bank of Nigeria (CBN), the Federal Ministry of Finance, the Budget Office of the Federation, the Office of the Accountant-General of the Federation, the National Bureau of Statistics (NBS), and annual reports of the Auditor-General for the Federation. A time-series research design covering a fifteen-year period will be employed to examine the relationship between public debt and capital expenditure accountability over time. Public debt will be measured using total public debt, domestic debt, external debt, debt servicing expenditure, and the debt-to-Gross Domestic Product (GDP) ratio, while capital expenditure accountability will be measured using capital budget implementation rate, capital expenditure utilization rate, project completion rate, audit compliance indicators, budget performance ratio, and public expenditure efficiency indicators. Data analysis will involve descriptive statistics to summarize the characteristics of the study variables, correlation analysis to determine the degree of association among variables, and time-series regression techniques, including Ordinary Least Squares (OLS), Autoregressive Distributed Lag (ARDL), or Error Correction Model (ECM), depending on the time-series properties of the data. Diagnostic tests including unit root tests, cointegration tests, multicollinearity, heteroskedasticity, autocorrelation, normality, model stability, and specification tests will be conducted to ensure the validity, consistency, and robustness of the empirical findings. The study anticipates that public debt will have a significant effect on capital expenditure accountability in Nigeria. Prudent utilization of borrowed funds is expected to improve the execution of capital projects, strengthen infrastructure development, enhance public sector transparency, improve budget implementation, and promote efficient utilization of public resources. Effective debt management is also anticipated to strengthen fiscal discipline, improve project monitoring and evaluation, enhance procurement transparency, and increase accountability in the implementation of debt-financed capital projects. Conversely, excessive borrowing, rising debt servicing obligations, weak institutional oversight, corruption, poor procurement practices, and inadequate project monitoring may reduce the efficiency and accountability of capital expenditure by diverting resources from productive investment, increasing fiscal pressures, and limiting the government's capacity to complete capital projects. Consequently, effective public debt management and strong accountability mechanisms are expected to contribute significantly to improving capital expenditure efficiency, fiscal transparency, infrastructure development, and sustainable public financial management in Nigeria. This study is expected to make significant theoretical and empirical contributions to the literature on public sector accounting, public finance, fiscal policy, and development economics by providing comprehensive evidence on the relationship between public debt and capital expenditure accountability in Nigeria. Unlike previous studies that focused primarily on debt sustainability or macroeconomic growth, this research specifically examines the accountability dimension of debt-financed capital expenditure using comprehensive fiscal indicators and a time-series analytical approach. The findings will provide valuable insights for the Debt Management Office (DMO), the Federal Ministry of Finance, the Budget Office of the Federation, the Office of the Accountant-General of the Federation, the National Assembly, the Office of the Auditor-General for the Federation, policymakers, development partners, public sector managers, and academic researchers regarding the strategic importance of prudent debt management in promoting accountability and sustainable infrastructure development. The study will also provide evidence-based recommendations for strengthening debt management policies, improving public financial management systems, enhancing budget implementation, reinforcing project monitoring and audit mechanisms, increasing fiscal transparency, and promoting greater accountability in the utilization of public debt for capital expenditure in Nigeria.

Keywords: Public debt, capital expenditure accountability, fiscal responsibility, public financial management, debt management, capital budget implementation, time-series analysis, Debt Management Office (DMO), fiscal transparency, Nigeria.