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Effect of Inventory Turnover on the Profitability of Listed Manufacturing Companies in Nigeria

Abstract

Inventory turnover is an important indicator of working capital and operational efficiency because it measures how effectively a company manages and converts its inventory into sales during a given accounting period. Efficient inventory management enables manufacturing companies to maintain appropriate stock levels, reduce holding and storage costs, minimize inventory obsolescence, avoid production disruptions, and improve cash flow. Profitability reflects the ability of a company to generate earnings from its available resources and operations. In Nigeria, listed manufacturing companies operate in an increasingly challenging economic environment characterized by inflation, exchange rate volatility, rising energy and transportation costs, supply chain disruptions, fluctuations in consumer demand, and increasing production costs. These factors can significantly affect inventory acquisition, storage, production, and sales, thereby influencing the profitability of manufacturing companies. Effective inventory turnover management is therefore essential for manufacturing firms seeking to optimize production processes, reduce unnecessary inventory costs, maintain adequate stock availability, and improve financial performance. Regulatory institutions such as the Financial Reporting Council of Nigeria (FRCN), the Securities and Exchange Commission (SEC), and the Nigerian Exchange Group (NGX) promote transparent financial reporting and sound financial management practices among listed companies. Despite these requirements, manufacturing companies may experience excessive inventory accumulation, stock shortages, slow-moving goods, obsolete inventory, and inefficient inventory control systems, all of which can adversely affect profitability. Although previous studies have examined inventory management and financial performance, empirical evidence regarding the effect of inventory turnover on the profitability of listed manufacturing companies in Nigeria remains limited and inconclusive. Against this background, this study investigates the effect of inventory turnover on the profitability of listed manufacturing companies in Nigeria. The study is anchored on Working Capital Management Theory, the Cash Conversion Cycle Theory, and the Resource-Based View (RBV). Working Capital Management Theory emphasizes the importance of efficiently managing current assets, including inventory, to achieve an appropriate balance between liquidity and profitability. The Cash Conversion Cycle Theory explains that efficient inventory turnover reduces the length of time funds remain tied up in inventory before being converted into sales and cash, thereby improving liquidity and reducing financing costs. The Resource-Based View suggests that effective inventory management constitutes an organizational capability that can improve operational efficiency, resource utilization, cost management, and competitive advantage. Collectively, these theoretical perspectives provide a comprehensive framework for explaining the relationship between inventory turnover and profitability of listed manufacturing companies in Nigeria. The study adopts a quantitative research design using a structured questionnaire administered to chief financial officers, finance managers, management accountants, inventory managers, production managers, supply chain managers, internal auditors, external auditors, warehouse managers, and other personnel involved in inventory and financial management within selected listed manufacturing companies in Nigeria. A stratified random sampling technique will be employed to ensure adequate representation of relevant manufacturing subsectors listed on the Nigerian Exchange Group (NGX). Inventory turnover will be measured using inventory turnover ratio, inventory conversion period, stock replenishment efficiency, inventory holding period, slow-moving inventory management, obsolete inventory control, and inventory monitoring practices, while profitability will be measured using Return on Assets (ROA), Return on Equity (ROE), net profit margin, operating profit margin, earnings per share, and profit growth. Primary data collected from respondents will be analyzed using descriptive statistics to summarize respondents' demographic characteristics and perceptions regarding inventory turnover and profitability. Structural Equation Modeling (SEM) will be employed to examine the effect of inventory turnover on profitability. The measurement model will be evaluated using Cronbach's Alpha, Composite Reliability (CR), Average Variance Extracted (AVE), and Confirmatory Factor Analysis (CFA) to establish the reliability and validity of the research instrument. Additional diagnostic tests, including multicollinearity assessment, common method bias analysis, and model fit indices such as the Comparative Fit Index (CFI), Tucker-Lewis Index (TLI), Root Mean Square Error of Approximation (RMSEA), and Standardized Root Mean Square Residual (SRMR), will be conducted to ensure the adequacy, consistency, reliability, and robustness of the structural model. The study anticipates that efficient inventory turnover will have a significant positive effect on the profitability of listed manufacturing companies in Nigeria. Higher inventory turnover is expected to indicate efficient movement of goods through the production and sales processes, thereby reducing storage costs, insurance expenses, deterioration, obsolescence, and the amount of capital tied up in inventory. Efficient inventory turnover is also expected to improve cash flow, reduce working capital financing requirements, increase production efficiency, and enable companies to respond more effectively to changes in market demand. Conversely, low inventory turnover may indicate excessive inventory accumulation, weak demand, poor production planning, inefficient purchasing practices, or obsolete stock, which may increase holding costs and reduce profitability. However, excessively high inventory turnover may also create the risk of stock shortages, production interruptions, and lost sales if inventory levels become inadequate. Therefore, an appropriate and efficiently managed inventory turnover level is expected to contribute significantly to improved operational efficiency, liquidity, and sustainable profitability among listed manufacturing companies in Nigeria. This study is expected to make significant theoretical and empirical contributions to the literature on inventory management, management accounting, working capital management, and corporate financial performance by providing comprehensive evidence on the relationship between inventory turnover and profitability of listed manufacturing companies in Nigeria. Unlike previous studies that broadly examined working capital management or inventory control, this research specifically evaluates inventory turnover as a determinant of profitability using primary data and Structural Equation Modeling (SEM). The findings will provide valuable insights for listed manufacturing companies, financial managers, management accountants, supply chain managers, auditors, investors, the Financial Reporting Council of Nigeria (FRCN), the Securities and Exchange Commission (SEC), the Nigerian Exchange Group (NGX), professional accounting bodies, policymakers, regulators, and academic researchers regarding the importance of efficient inventory management. The study will also provide evidence-based recommendations for improving inventory forecasting, strengthening stock control systems, optimizing procurement and production planning, reducing obsolete and slow-moving inventory, improving inventory monitoring, and maintaining appropriate stock levels to promote sustainable profitability among listed manufacturing companies in Nigeria.

Keywords: Inventory turnover, profitability, listed manufacturing companies, inventory management, working capital management, stock control, operational efficiency, cash conversion cycle, Structural Equation Modeling (SEM), Nigeria.