Abstract
This paper seeks to determine whether the Herfindahl--Hirschman index (HHI) adequately accounts for the roles of market share inequality and the number of competitors in explaining bank deposit and loan rates. This is been done by estimating deposit-rate and loan-rate equations in which the HHI is decomposed into components that reflect share inequality and number of competitors and, alternatively, by adding measures of share inequality and the number of competitors as additional explanatory variables. Results are inconclusive in the case of deposit rates but suggest that the HHI does not give sufficient weight to the number of competitors in explaining loan rates.
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