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Competition and the Number of Firms in a Market: Are Duopolies More Competitive Than Atomistic Markets?

Joseph E. Stiglitz

Title:
Competition and the Number of Firms in a Market: Are Duopolies More Competitive Than Atomistic Markets?
Author(s):
Stiglitz, Joseph E.
Date:
Type:
Articles
Department:
Business
Volume:
95
Permanent URL:
Book/Journal Title:
Journal of Political Economy
Abstract:
This paper uses a variant of the standard search model to examine market equilibrium and the consequences for market equilibrium of an increase in the number of firms. If marginal search costs increase with the number of searches, then the demand curve facing any firm will be kinked, with the elasticity of demand with respect to price decreases being less than with respect to price increases; prices may not change in response to changes in marginal costs. As the number of firms increases, the maximum price that is consistent with equilibrium increases, to the monopoly price, but the minimum price decreases. On the other hand, if marginal search costs decrease with the number of searches, equilibrium, if it exists, is characterized by a price distribution.
Subject(s):
Economics
Item views:
34
Metadata:
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