Net interest margins and firm performance in developing countries

Purpose - This paper aims to examine the relationship between performance and some macro and micro variables in the Argentine commercial banking industry. Included are the profitability and interest variables; return on assets (ROA) and net interest margin (NIM) over the period of 1994 to 2011. Design/methodology/approach - The empirical construct is guided by recent theories of banking performance that employ an industrial organization framework and two dependent variables (with identical control variables) to assure robustness and comparability in findings. The variables for the panel estimated generalized least square (panel EGLS) are constructed using income statements of 62 commercial banks (firm‐level data) as well as a number of industry‐specific and macroeconomic indicators. Findings - Factors such as expense management (operating cost efficiency/inefficiency), leverage and liquidity appear to be important forces behind the net interest margins (NIM) and profits (ROA) in the Argentine banking industry. Higher return on assets (ROA) is associated with banks carrying less leverage and therefore displaying a lower ratio of debt to total assets. Higher interest margin (NIM) is associated with higher operating expenses. Regarding the macroeconomic variables, inflation negatively affects profitability but is positively and significantly related to net interest margin. Banking environment has a positive effect on performance, reflecting the complementarity between banking performance and stock market capitalization. Originality/value - The paper's value lies in showing that a firm's specific variables reveal better insights when analyzed in relation to banking environment. Indirectly, some of the value of this work lies in highlighting the Central Bank's accommodative monetary policy that has been driving Argentina's economic recovery and credit boom arising in an inflationary environment.