In the United States, antitrust authorities rely heavily on numerical measures of local banking market concentration such as the Herfindahl Hirschmann Index to assess the likely competitive effects of proposed bank mergers and acquisitions. This approach to antitrust enforcement relies on two...

We investigate how banking market competition, informational opacity, and sensitivity to shocks have changed over the last three decades by examining the persistence of firm-level rents. We develop propagation mechanisms with testable implications to isolate the sources of persistence. Our...

We provide evidence that a bank's subordinated debt yield spread is not, by itself, a sufficient measure of default risk. We use a model in which subordinated debt is held by investors with superior knowledge ("informed investor hypothesis"). First, we show that in theory the yield spread on...

This paper presents empirical evidence consistent with the predictions of the endogenous sunk cost model of Sutton (1991), with an application to banks. In particular, banking markets remain concentrated regardless of market size. Given an asymmetric oligopoly where dominant and fringe firms...

This paper uses data from the triennial waves of the Survey of Consumer Finances from 1992 to 2004 to examine changes in the use of financial services with implications for the definition of banking markets. Despite powerful technological and regulatory shifts over this period, households'...