Project – The Effect of Interest Rate Changes on Private Sector Investment in Nigeria from 2020-2025

CHAPTER ONE

INTRODUCTION

1.1 Background of the Study

Investment remains a fundamental driver of economic growth, employment generation, productivity improvement, and structural transformation in developing economies. The private sector, particularly through manufacturing, agriculture, trade, technology, and services, contributes significantly to national output by mobilising resources, creating employment opportunities, and improving competitiveness. However, the capacity of private firms to undertake productive investment depends largely on the availability and cost of finance. Among the major macroeconomic factors influencing private sector investment decisions is the interest rate, which represents the cost of borrowing funds and the reward for saving capital (Jorgenson, 1963; Mishkin, 2019).

Interest rate serves as an important instrument of monetary policy through which central banks influence economic activities. When interest rates are reduced, borrowing becomes cheaper, encouraging firms to access credit for expansion, acquisition of machinery, research and development, and other investment activities. Conversely, when interest rates rise, the cost of capital increases, reducing firms’ willingness to borrow and invest. This relationship forms the basis of the monetary transmission mechanism, where changes in policy rates affect commercial lending rates, aggregate demand, and investment behaviour (Taylor, 1993; Bernanke & Gertler, 1995).

In Nigeria, the relationship between interest rates and private sector investment has remained a major economic concern due to persistent challenges associated with high borrowing costs, limited access to affordable credit, inflationary pressures, and macroeconomic instability. Although financial sector reforms have improved access to banking services and credit facilities, many private enterprises, especially micro, small, and medium enterprises (MSMEs), continue to face difficulties obtaining affordable long-term financing required for expansion and innovation (Ayyagari, Demirgüç-Kunt, & Maksimovic, 2017).

The period between 2020 and 2025 represents a significant phase in Nigeria’s economic development, characterised by major economic disruptions and policy adjustments. In 2020, the outbreak of the COVID-19 pandemic negatively affected business operations, supply chains, investment decisions, and economic activities globally and in Nigeria. To reduce the economic impact of the pandemic, the Central Bank of Nigeria (CBN) adopted accommodative monetary measures, including reductions in policy rates and intervention financing aimed at supporting businesses and stimulating economic recovery (Central Bank of Nigeria [CBN], 2020).

However, from 2021 onward, inflationary pressures intensified due to global supply chain disruptions, rising food and energy prices, exchange rate challenges, and geopolitical tensions. In response, monetary authorities began tightening monetary policy to control inflation. The CBN increased the Monetary Policy Rate (MPR) several times between 2022 and 2025, resulting in higher lending rates faced by businesses. The tightening cycle reflected the central bank’s effort to restore price stability, although concerns emerged regarding its possible negative consequences for private investment and economic growth.

Theoretically, higher interest rates can discourage private investment through the cost-of-capital channel. Firms compare the expected returns from investment projects with the prevailing borrowing costs. When interest rates increase beyond expected investment returns, firms may postpone or cancel investment decisions. According to the Keynesian theory of investment, investment demand is inversely related to interest rates because firms are less likely to undertake capital projects when the cost of financing becomes excessive (Keynes, 1936).

Similarly, the neoclassical theory of investment explains that firms determine investment levels based on the user cost of capital. An increase in interest rates raises the cost of acquiring and maintaining capital assets, thereby reducing investment demand (Jorgenson, 1963). In developing economies such as Nigeria, where firms depend heavily on bank financing due to underdeveloped capital markets, changes in lending rates can have substantial effects on private investment activities.

The Nigerian private sector plays a critical role in economic development. According to the World Bank, improving private sector participation remains essential for Nigeria’s transition toward sustainable and inclusive economic growth, particularly because businesses provide employment opportunities and drive productivity improvements. However, limited access to affordable finance remains one of the major constraints affecting business expansion.

Between 2020 and 2025, Nigerian businesses experienced a complex economic environment. The COVID-19 crisis reduced business revenues and investment capacity, while subsequent monetary tightening increased financing costs. Many firms, particularly MSMEs, experienced difficulty accessing bank loans because of high interest rates, stringent lending conditions, and uncertainty regarding future economic conditions. The World Bank has also highlighted that Nigerian MSMEs continue to experience significant financing constraints, with limited access to formal credit restricting their growth potential.

Furthermore, Nigeria’s private investment environment has been affected by other macroeconomic challenges, including exchange rate volatility, inflation, infrastructure deficits, and energy supply problems. These factors interact with interest rate movements to influence investment decisions. For example, even when credit is available, firms may avoid borrowing when inflation reduces purchasing power and economic uncertainty increases. Therefore, understanding the independent effect of interest rate changes on private sector investment is important for designing appropriate monetary and investment policies.

Several empirical studies have examined the relationship between interest rates and investment in Nigeria. Some studies have found that high interest rates significantly reduce private sector investment by increasing financing costs and discouraging entrepreneurship. Others argue that the relationship is more complex because interest rate effects depend on inflation levels, financial market development, exchange rate stability, and investor confidence (Adeniran, Yusuf, & Adeyemi, 2014; Udoka & Anyingang, 2012).

Despite existing studies, there remains a need to examine the period 2020–2025 because it captures unique economic circumstances involving pandemic recovery, inflation shocks, monetary tightening, and changing investment conditions. Previous studies often focused on longer historical periods without adequately capturing the recent monetary policy adjustments and their implications for private sector investment. Therefore, this study investigates the effect of interest rate changes on private sector investment in Nigeria from 2020 to 2025.

1.2 Statement of the Problem

Private sector investment is widely recognised as a major contributor to economic growth, employment generation, innovation, and industrial development. However, Nigerian businesses have continued to experience declining investment capacity due to persistent financial constraints, particularly the high cost of borrowing. Although monetary authorities have implemented several policies aimed at improving credit availability, private firms still face difficulties accessing affordable finance for productive activities.

The major concern is that rising interest rates may weaken private sector investment by increasing the cost of loans required for business expansion, machinery acquisition, technological improvement, and working capital financing. Between 2020 and 2025, Nigerian businesses operated under changing interest rate conditions. The initial monetary easing introduced during the COVID-19 period was followed by aggressive monetary tightening aimed at controlling inflation. While these policies were necessary for macroeconomic stability, they created concerns about their effects on investment activities.

Many private enterprises, especially MSMEs, depend heavily on commercial bank loans because alternative financing sources such as venture capital and corporate bond markets remain relatively limited. Consequently, increases in lending rates may disproportionately affect smaller businesses that have fewer financing options. High interest rates can reduce profitability, discourage expansion plans, increase production costs, and limit employment creation.

Another problem is the persistent gap between monetary policy objectives and private sector realities. While increasing interest rates may help control inflation, excessive increases may constrain productive investment and slow economic recovery. This creates a policy dilemma between achieving price stability and promoting private sector-led growth.

Existing studies on interest rates and investment in Nigeria have produced mixed findings. Some researchers identify a negative relationship between interest rates and investment, while others suggest that factors such as inflation, exchange rate movements, and financial sector conditions influence the relationship. Moreover, many studies examined periods before the recent economic shocks associated with COVID-19 and post-pandemic inflation.

Therefore, the problem addressed by this study is the insufficient understanding of how interest rate changes between 2020 and 2025 influenced private sector investment in Nigeria. Without clear evidence, policymakers may face challenges designing monetary policies that balance inflation control with investment promotion. This study therefore seeks to empirically examine the effect of interest rate changes on private sector investment in Nigeria during the period under review.

1.3 Aim and Objectives of the Study

The main aim of this study is to examine the effect of interest rate changes on private sector investment in Nigeria from 2020 to 2025. The study seeks to determine whether fluctuations in interest rates influenced the investment decisions and activities of private sector operators during the period under review.

The specific objectives of the study are to:

1. Examine the trend and pattern of interest rate changes in Nigeria between 2020 and 2025.
2. Determine the effect of interest rates on private sector investment in Nigeria during the period under study.
3. Investigate the extent to which lending rates influenced access to credit and investment decisions among private sector enterprises in Nigeria.
4. Assess the implications of monetary policy-induced interest rate adjustments on private sector growth and investment performance in Nigeria.

1.4 Research Questions

This study seeks to provide answers to the following research questions:

1. What was the trend and pattern of interest rate changes in Nigeria between 2020 and 2025?
2. To what extent did interest rate changes affect private sector investment in Nigeria during the period under study?
3. How did lending rate variations influence access to credit and investment decisions among private sector enterprises in Nigeria?
4. What are the implications of interest rate adjustments on private sector growth and investment performance in Nigeria?

1.5 Research Hypothesis

The following null hypothesis will guide the study:

H₀: Interest rate changes have no significant effect on private sector investment in Nigeria from 2020 to 2025.

1.6 Significance of the Study

This study is significant because it examines an important macroeconomic issue that affects economic growth, business development, and financial stability in Nigeria. The findings of the study will provide useful information to policymakers, financial institutions, private sector operators, researchers, and students of economics.

Policy Makers and Monetary Authorities

The findings will be useful to monetary authorities, particularly the Central Bank of Nigeria, in evaluating the implications of interest rate decisions on private sector investment. Since interest rate adjustments represent one of the major tools of monetary policy, understanding their effects on investment behaviour will assist policymakers in designing balanced policies that achieve price stability without unnecessarily restricting economic activities.

Private Sector Operators

The study will benefit private businesses by improving their understanding of how interest rate movements influence financing costs, borrowing decisions, and investment planning. Entrepreneurs and business managers can use the findings to make informed financial decisions, especially when considering external financing for expansion and productivity improvement.

Financial Institutions

Commercial banks and other financial institutions will benefit from the study by gaining insights into how interest rate changes affect credit demand and private sector borrowing behaviour. The findings may assist financial institutions in developing appropriate lending strategies that support business growth while maintaining financial sustainability.

Researchers and Academic Institutions

The study will contribute to existing literature on monetary policy, interest rate dynamics, and investment behaviour in developing economies. It will serve as a reference material for future researchers interested in examining the relationship between financial conditions and private sector development in Nigeria and other emerging economies.

Government and Development Agencies

The study will provide relevant information for government agencies involved in economic planning and private sector development. Understanding the relationship between interest rates and investment can assist in developing policies aimed at improving access to affordable finance and promoting sustainable economic growth.

1.7 Scope of the Study

This study focuses on examining the effect of interest rate changes on private sector investment in Nigeria from 2020 to 2025.

The study is limited to Nigeria’s macroeconomic environment and examines how changes in interest rates influenced private sector investment activities during the selected period. The study considers interest rate as the independent variable, while private sector investment represents the dependent variable.

Conceptually, the study focuses on major interest rate indicators such as:

• Monetary Policy Rate (MPR);
• Commercial bank lending rates;
• Deposit interest rates; and
• Cost of borrowing.

Private sector investment will be examined in relation to:

• Private sector credit growth;
• Business expansion activities;
• Capital formation; and
• Investment performance.

The period 2020–2025 was selected because it represents a critical period characterised by significant economic changes, including the COVID-19 pandemic, post-pandemic recovery, inflationary pressures, and monetary policy tightening. These developments provide an important basis for assessing how interest rate movements affected private investment decisions.

1.8 Definition of Terms

Interest Rate

Interest rate refers to the cost of borrowing money or the return earned from lending funds, usually expressed as a percentage of the principal amount over a specific period. In this study, interest rate refers to monetary policy and market-based rates that influence the cost of financing private sector activities.

Interest Rate Changes

Interest rate changes refer to increases or decreases in prevailing interest rates resulting from monetary policy decisions, market conditions, inflation trends, and financial sector developments. In this study, it represents fluctuations in Nigeria’s lending and policy rates between 2020 and 2025.

Private Sector Investment

Private sector investment refers to expenditure by privately owned businesses on productive assets such as machinery, equipment, buildings, technology, and business expansion activities. It represents investments undertaken by individuals, firms, and corporate organisations outside government ownership.

Private Sector Credit

Private sector credit refers to loans and advances provided by financial institutions to individuals and businesses for productive and investment purposes. It is often used as an indicator of financial support available to private enterprises.

Monetary Policy Rate (MPR)

Monetary Policy Rate is the benchmark interest rate set by the Central Bank of Nigeria to influence other interest rates within the financial system. Changes in the MPR affect borrowing costs, credit conditions, and economic activities.

Lending Rate

Lending rate refers to the interest rate charged by commercial banks and other financial institutions on loans provided to individuals and businesses. Higher lending rates increase borrowing costs and may discourage investment activities.

Private Sector Growth

Private sector growth refers to the expansion and improvement of private business activities measured through increased production, employment creation, profitability, and investment capacity.

Investment Decision

Investment decision refers to the process through which businesses determine whether to undertake capital projects based on expected returns, financing costs, economic conditions, and risk considerations.

Project – The Effect of Interest Rate Changes on Private Sector Investment in Nigeria from 2020-2025