Th. Hannan, MARKET SHARE INEQUALITY, THE NUMBER OF COMPETITORS, AND THE HHI - AN EXAMINATION OF BANK PRICING, Review of industrial organization, 12(1), 1997, pp. 23-35
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. T
his is been done by estimating deposit-rate and loan-rate equations in
which the HHI is decomposed into components that reflect share inequa
lity and number of competitors and, alternatively, by adding measures
of share inequality and the number of competitors as additional explan
atory variables. Results are inconclusive in the case of deposit rates
but suggest that the HHI does not give sufficient weight to the numbe
r of competitors in explaining loan rates.