Determinants of capital adequacy of commercial banks in South Africa: A panal and dynamic approach

Abstract

This study explored the bank-specific and macroeconomic factors influencing capital adequacy in South African commercial banks. In this research, a balanced panel data set comprising 11 recapitalized banks was employed, spanning the period from 2008 to 2019. Employing panel regression techniques including OLS, Fixed Effects, Random Effects, and the Generalized Method of Moments (GMM), the analysis examines the influence of profitability (ROA), bank size, leverage, broad money supply, and the central bank’s monetary policy rate on the Capital Adequacy Ratio (CAR). The results indicate that profitability, bank size, leverage, and the broad money supply are critical determinants of capital sufficiency. Banks with increased profitability and increased exposure to the money supply typically demonstrate more robust capital positions. Larger bank size and increased leverage levels negatively affect capital adequacy ratios. The little impact of the delayed CAR signifies minimal persistence in capital buffer methods over time, implying that banks may not significantly depend on prior year capital conditions in their current capital planning. The study highlights the complex nature of capital sufficiency, influenced by microeconomic factors such as size and leverage, as well as macroeconomic indices like the money supply. The findings substantiate the Capital Buffer Theory and furnish critical insights for regulators, bank executives, and policymakers seeking to bolster the resilience of the banking industry in South Africa.