VARIATION IN OPERATING COSTS AND GROWTH OF SMALL- MEDIUM ENTERPRISES IN LAGOS STATE

VARIATION IN OPERATING COSTS AND GROWTH OF SMALL-MEDIUM ENTERPRISES IN LAGOS STATE

ABSTRACT

This study examined the effect of variation in operating costs on the growth of small and medium enterprises (SMEs) in Lagos State, Nigeria. Specifically, it investigated how fluctuations in labor costs, material costs, overhead costs, and administrative costs independently affect SME revenue growth, employment growth, and market expansion. The study adopted a survey research design. The population comprised registered SMEs in Lagos State, drawing on a base of approximately 34,000 SMEs registered with the Small and Medium Enterprises Development Agency of Nigeria (SMEDAN) in Lagos. A sample of 383 respondents was selected using stratified random sampling. Data were collected using structured questionnaires and analyzed using descriptive statistics, Pearson correlation, and multiple regression analysis with the aid of Statistical Package for the Social Sciences (SPSS) version 27. The study found that variation in labor costs had a significant negative effect on SME revenue growth (β = -0.412, p < 0.05); variation in material costs significantly constrained employment growth (β = -0.389, p < 0.05); overhead cost fluctuations negatively affected market expansion (β = -0.361, p < 0.05); and administrative cost variation had a significant adverse effect on overall SME growth (β = -0.344, p < 0.05). The study concluded that uncontrolled variation in operating costs is a critical constraint on SME growth in Lagos State. It recommended that SMEs adopt structured cost management frameworks, including Kaizen-informed continuous improvement practices and resource-based cost control capabilities, and that government policy should target the structural drivers of cost instability, particularly energy costs, logistics, and taxation. The study contributes to knowledge by providing empirical evidence on the specific cost components that drive growth volatility in Lagos-based SMEs, a gap not previously addressed in the literature.

Keywords: Operating Costs, Small and Medium Enterprises, SME Growth, Cost Variation, Lagos State, Nigeria, Kaizen Costing, Resource-Based Theory

CHAPTER ONE

INTRODUCTION

1.1 Background to the Study

Small and medium enterprises (SMEs) occupy a structurally important position in the Nigerian economy. They constitute the largest segment of the business population, contribute significantly to gross domestic product, and account for a substantial proportion of employment outside the public sector. According to the National Bureau of Statistics (NBS) and SMEDAN Joint Survey on Micro, Small, and Medium Enterprises (2021), SMEs in Nigeria account for approximately 96 percent of businesses and 84 percent of employment in the country. In Lagos State, which hosts the largest concentration of commercial and industrial activity in Nigeria, SMEs are the dominant engine of economic activity, spanning manufacturing, retail, services, information technology, fashion, food processing, and logistics, among others.

Despite their numerical dominance and economic relevance, SMEs in Nigeria face a persistent and underappreciated challenge: the instability of operating costs. Operating costs, which include labor costs; raw material costs; overhead costs such as electricity, rent, and transportation; and administrative costs, are not static in the Nigerian business environment. They fluctuate in response to macroeconomic pressures, including inflation, exchange rate depreciation, fuel price increases, and inconsistent government policy. The consequence of this volatility is that SME owners cannot reliably forecast their cost base, plan capital expenditure, or project growth trajectories. The result is a pattern of erratic profitability and constrained growth that inhibits the development of SMEs into medium and large enterprises over time.

The challenge of operating cost management is particularly acute in Lagos State. As Nigeria's commercial capital, Lagos hosts a dense concentration of businesses that compete intensely for limited inputs. Labor costs in Lagos are higher than in other states because of the demand for skilled workers and the high cost of living. Material costs are subject to sharp fluctuations because of supply chain disruptions, port congestion at Apapa and Tin Can Island, and the pass-through effects of naira depreciation on imported inputs. Overhead costs, particularly electricity, are among the most significant cost drivers for SMEs in Lagos, given the perennial inadequacy of the public electricity supply and the dependence on generator-powered operations. Administrative costs, including compliance costs, multiple taxes and levies, and regulatory fees, add further pressure on businesses that often lack the financial buffers available to large corporations.

The relationship between operating cost variation and business growth has attracted increasing scholarly attention globally. Oyewole (2026) demonstrated that effective cost control significantly improves the profitability of small businesses in the United States. Ibrahim, Egbide, Fakile, and Madugba (2025) found that cost control techniques, including budgetary control, target costing, and cost-volume-profit analysis, significantly improved the survival rate of SMEs in South-West Nigeria. Akan, Sinebe, and Bereprebofa (2023) identified high operating costs as among the most significant constraints on SME sustainability in Nigeria. However, these studies addressed cost control as a management response rather than examining how the variation itself, as a dynamic and unpredictable phenomenon, independently affects different dimensions of SME growth.

The theoretical literature offers two complementary frameworks for understanding this relationship. Kaizen costing theory, rooted in the Japanese philosophy of continuous improvement, argues that sustained incremental reductions in operating costs, achieved through continuous review and refinement of production and operational processes, are central to long-term competitiveness and growth. Under this framework, cost variation is not simply a financial inconvenience but a symptom of operational inefficiency that erodes competitiveness over time. The resource-based theory, developed by Wernerfelt (1984) and elaborated by Barney (1991), offers a complementary perspective by framing cost control as an internal strategic capability. For SMEs, which are characterized by resource constraints, the ability to manage and control operating costs constitutes a form of strategic resource that enables competitive advantage and sustained growth even in hostile environments.

Notwithstanding the growing body of literature on SME performance, cost management, and business growth in Nigeria, a specific empirical examination of how variation in operating costs, disaggregated into its component elements, affects SME growth in Lagos State remains absent from the literature. The existing studies reviewed in this work addressed performance management systems (Abaikpa, 2025), working capital and financial obligations (Udoh &

Udoh, 2025), capital costs and sustainability (Akan et al., 2023), cost control and profitability (Oyewole, 2026), cost control techniques and survival (Ibrahim et al., 2025), and general SME challenges (Abdullahi, Jakada, & Kabir, 2016). None of these studies examined operating cost variation as the primary independent variable and SME growth as the dependent variable, with Lagos as the study area.

This study addressed that gap by providing empirical evidence on the specific effects of labor cost variation, material cost variation, overhead cost variation, and administrative cost variation on the revenue growth, employment growth, and market expansion of SMEs in Lagos State. The findings are expected to inform SME owners, policymakers, and financial institutions on the cost dynamics that most significantly constrain SME growth in Nigeria's most commercially active state.

1.2 Statement of the Problem

The growth of small and medium enterprises in Lagos State is constrained by persistent and unpredictable fluctuations in operating costs. While the strategic importance of SMEs to the Nigerian economy is well established, the mechanisms through which cost instability impedes growth remain insufficiently understood. SME operators in Lagos State routinely report difficulty in managing their cost base, attributing operational setbacks and stagnation to unexpected rises in labor costs, material prices, overhead expenses, and administrative charges. Yet the empirical evidence necessary to substantiate these concerns, and to disaggregate the effect of each cost component on specific growth indicators, is largely absent from the literature.

The problem is compounded by the structural characteristics of the Nigerian operating environment. Inflation rates have remained elevated, with the NBS (2024) reporting a headline inflation rate of 34.80 percent in December 2024, among the highest in Nigeria's recent economic history. The depreciation of the naira following the unification of the foreign exchange windows in June 2023 significantly raised the cost of imported inputs for manufacturers and retailers. The removal of the petrol subsidy in May 2023 sharply increased transportation and logistics costs, with direct knock-on effects on SME operating expenses. These developments mean that the cost base of SMEs is not merely fluctuating cyclically but is shifting structurally upward, with potentially severe consequences for growth.

The problem is therefore not simply one of financial management but of business survival and growth potential. If SMEs cannot control cost variation, their ability to invest in expansion, hire additional labor, enter new markets, and improve productivity is severely compromised. This study argued that the absence of empirical evidence linking specific cost components to specific growth outcomes is a critical gap that impedes both policy design and managerial decision-making. By providing that evidence for Lagos State, this study addressed a concrete problem facing SMEs, policymakers, and development finance institutions in Nigeria.

1.3 Aim and Objectives of the Study

The aim of this study is to examine the effect of variation in operating costs on the growth of small and medium enterprises in Lagos State, Nigeria. Specifically, the objectives of the study are to:

1.     Examine the effect of labour cost variation on the revenue growth of SMEs in Lagos

State.

2.     Determine the effect of material cost variation on the employment growth of SMEs in

Lagos State.

3.     Investigate the effect of overhead cost variation on the market expansion of SMEs in

Lagos State.

4.     Assess the effect of administrative cost variation on the overall growth of SMEs in

Lagos State.

1.4 Research Questions

The following research questions guided this study:

5.     What is the effect of labour cost variation on the revenue growth of SMEs in Lagos

State?

6.     What is the effect of material cost variation on the employment growth of SMEs in

Lagos State?

7.     What is the effect of overhead cost variation on the market expansion of SMEs in

Lagos State?

8.     What is the effect of administrative cost variation on the overall growth of SMEs in

Lagos State?

1.5 Statement of Hypotheses

The following null hypotheses were tested in this study:

H?1: Labor cost variation has no significant effect on the revenue growth of SMEs in Lagos State.

H02: Material cost variation has no significant effect on the employment growth of SMEs in Lagos State.

H03: Overhead cost variation has no significant effect on the market expansion of SMEs in Lagos State.

H04: Administrative cost variation has no significant effect on the overall growth of SMEs in

Lagos State.

1.6 Significance of the Study

This study is significant on multiple grounds. For SME owners and managers in Lagos State, the findings provide specific empirical evidence on which cost components most adversely affect which dimensions of business growth. This enables more targeted cost management strategies rather than generalized efforts to reduce expenditure. An SME owner who understands that labor cost variation specifically constrains revenue growth, for example, can prioritize workforce planning and compensation structuring in a way that reduces cost unpredictability without sacrificing productivity.

For policymakers and regulatory agencies, including the Small and Medium Enterprises

Development Agency of Nigeria (SMEDAN), the Federal Ministry of Industry, Trade and Investment, and state-level SME support agencies in Lagos, the study provides evidence of the specific structural cost pressures that undermine SME growth. This can inform the design of targeted interventions, including electricity subsidies, transportation cost relief schemes, rationalization of levies and taxes, and support for local raw material sourcing that reduces the volatility SMEs face in their cost base.

For financial institutions and development finance organisations, including the Bank of Industry, the Development Bank of Nigeria, and commercial banks with SME lending

portfolios, the findings highlight the risk dimension of operating cost variation as a determinant of SME default and growth failure. This can inform credit risk models and the design of financial products that incorporate cost stabilization support alongside lending.

For academics and researchers, the study contributes to the empirical literature on SME economics in Nigeria by filling a documented gap. It provides a replicable methodology for examining the disaggregated effects of cost components on growth outcomes, which future studies can apply across other states or sectors. It also contributes to the theoretical integration of Kaizen costing and resource-based theory in the context of SME management in developing countries.

1.7 Delimitation of the Study

This study is limited to small and medium enterprises in Lagos State, Nigeria. It does not cover microenterprises, large corporations, or SMEs in other states of Nigeria. The study focused on four categories of operating costs, namely labor costs, material costs, overhead costs, and administrative costs, and three dimensions of growth, namely revenue growth, employment growth, and market expansion. It did not examine profitability, return on investment, or other financial performance metrics as dependent variables.

The study adopted a cross-sectional survey design and relied on primary data collected through structured questionnaires administered to SME owners and managers. It did not incorporate audited financial statements, SPSS-linked secondary datasets, or longitudinal data. The study was conducted in 2025 and reflects the operating conditions of that period. Findings may not be generalizable to other time periods or geographic contexts without replication.

1.8 Definition of Terms

Operating Costs: These are the expenses incurred by a business in the course of its regular, day-to-day operations. In this study, operating costs are disaggregated into four components: labor costs, material costs, overhead costs, and administrative costs.

Labor Costs: These are all expenses incurred in compensating employees, including wages, salaries, statutory contributions such as pension and NSITF, and other employment-related costs.

Material Costs: These are the costs of raw materials, components, and consumables used in the production of goods or the delivery of services.

Overhead Costs: These are the indirect operating costs of a business that are not directly attributable to a specific product or service. In this study, they include electricity, rent, transportation, and equipment maintenance costs.

Administrative Costs: These include the costs of managing the business, including regulatory compliance costs, license fees, taxes and levies, and the cost of administrative personnel. Small and Medium Enterprises (SMEs): For the purposes of this study, SMEs are enterprises classified in accordance with the SMEDAN National Policy on Micro, Small, and Medium Enterprises (2013), which defines small enterprises as those with 10 to 49 employees and assets between 5 million and 50 million naira (excluding land and buildings) and medium enterprises as those with 50 to 199 employees and assets between 50 million and 500 million naira (excluding land and buildings).

SME Growth: This refers to the expansion of an enterprise's capacity, market share, revenue base, and workforce over time. In this study, SME growth is measured through three indicators: revenue growth, employment growth, and market expansion.

Cost Variation: This refers to the degree of fluctuation in the level of a specific cost category over a defined period. It encompasses both upward and downward movements but is primarily associated in the literature with cost increases driven by external economic pressures.