Beyond Interest Income: Revenue Diversification and Financial Stability in Emerging Markets

This study examines the relationship between non-interest income and bank earnings stability in emerging market banking systems, using panel evidence from 26 commercial banks over a six-year period. As financial sectors in developing economies increasingly diversify revenue sources beyond traditional intermediation, the stability implications of such diversification remain empirically contested. Guided by Modern Portfolio Theory, this study evaluates the effect of disaggregated components of non-interest income fees and commissions income, foreign exchange trading income, dividend income, and other operating income on bank insolvency risk measured by the Z-score. Quantitative research design was employed using balanced panel data, and both pooled Ordinary Least Squares (OLS) and fixed effects regression models were estimated to account for time and bank-specific heterogeneity. The findings indicate that fees and commissions income and other operating income are positively associated with financial stability, suggesting that certain forms of revenue diversification enhance earnings resilience. In contrast, foreign exchange trading income and dividend income exhibit statistically insignificant effects on insolvency risk. The results demonstrate that the composition of non-interest income, rather than diversification per se, determines stability outcomes in emerging markets. These findings provide important implications for bank management and regulatory policy, highlighting the need for targeted diversification strategies that strengthen, rather than undermine, financial stability.