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The determinants of bank interest rate margins: an international study

by Anthony Saunders, Liliana Schumacher
Journal of International Money and Finance ()

Abstract

This paper studies the determinants of bank net interest margins (NIMs) in six selected European countries and the US during the period 1988-1995 for a sample of 614 banks. We apply the Ho and Saunders model (Ho, T., Saunders, A., 1981. The determinants of bank interest margins: theory and empirical evidence. Journal of Financial and Quantitative Analyses 16, 581-600) to a multicountry setting and decompose bank margins into a regulatory component, a market structure component and a risk premium component. The regulatory components in the form of interest-rate restrictions on deposits, reserve requirements and capital-to-asset ratios have a significant impact on banks NIMs. The empirical results suggest an important policy trade-off between assuring bank solvency-high capital-to-asset ratios-and lowering the cost of financial services to consumers-low NIMs. The mon segmented or restricted the banking system-both geographically and by activity-the larger appears to be the monopoly power of existing banks, and the higher their spreads. Macro interest-rate volatility was found to have a significant impact on bank NIMs; this suggests that macro policies consistent with reduced interest-rate volatility could have a positive effect in reducing bank margins. (C) 2000 Elsevier Science Ltd. All rights reserved. JEL classification: D21; G15; G21.

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