Author(s): Philip Aiyepola, Felix Chirairo and Mduduzi Moyo
Purpose: This study critically evaluates the diagnostic power of conventional financial ratios in predicting the long-term financial sustainability of major corporations. It addresses the persistent empirical anomaly where firms with ostensibly healthy reported ratios experience failure, investigating the proposition that Free Cash Flow (FCF) represents a more robust metric of underlying economic health. The primary objective is to identify which, if any, traditional performance measurement categories demonstrate a significant empirical relationship with FCF generation. Design/Methodology/Approach: Employing a quantitative, deductive research design, the study analyzes a ten-year (2015-2024) panel dataset of the Top 40 companies listed on the Johannesburg Stock Exchange (JSE). Financial data was sourced from the audited disclosures in the IRESS database. A mixed fixed effects panel regression model was utilized to examine the relationship between a comprehensive set of financial ratios—spanning profitability, liquidity, solvency, activity, and market valuation and free cash flow, while controlling for unobserved firm heterogeneity and temporal macroeconomic effects. Findings: The correlation and regression analyses reveal a profound disconnect. The vast majority of conventional financial ratios, including key profitability (Operating profit margin, return on equity) and liquidity (current ratio) metrics, show weak or statistically insignificant associations with free cash flow. The panel regression identifies only two primary determinants with significant explanatory power: The debt-to assets ratio (negative effect, β=-0.01655, p<0.05) and assets per capital employed (negative effect, β= 0.00109, p<0.05). This indicates that free cash flow generation is predominantly influenced by capital structure decisions and asset intensity, rather than by accounting profitability or short-term liquidity. Originality/Value: This research makes a significant empirical contribution by demonstrating that standard financial ratio analysis is an inadequate tool for assessing and projecting free cash flow, a paramount indicator of financial sustainability. It provides robust, methodology-strong evidence from a leading emerging market, shifting the focus of sustainability assessment from income statement performance to balance sheet efficiency and financial structure. The findings compel a paradigm shift in corporate finance theory and practice, advocating for a cash-centric analytical framework over traditional profit-centric models.