SFB 303 Discussion Paper No. A-402

Author: Grandmont, Jean-Michel
Title: Behavioral Heterogeneity and Cournot Oligopoly Equilibrium
Abstract: It is not unfrequent to see studies of imperfect competition or of industrial organization rest upon questionable foundations such as the hypothesis that inverse market demand is, whenever it is positive, concave or even linear. Assumptions of this sort are not robust (i.e. "additive") in the sense that they are not usually preseved through aggregation of different sectors that would satisfy them individually. The present paper investigates an alternative specification that is based upon the plausible existence of significant heterogeneities among demanders. It is demonstrated that specific forms of demand heterogeneity tend to stabilize market expenditures. In a partial equilibrium context, sufficient demand heterogeneity is shown to imply existence and unicity of a Cournot oligopoly equilibrium.
Keywords: Aggregation, heterogeneity, equivalence scales, oligopoly equilibrium.
JEL-Classification-Number: D00, D43, L13
Creation-Date: February 1993
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