Testing For "Monopoly" Equilibrium
提出一个检验企业是否为不受战略互动或进入威胁影响的垄断者的通用方法，通过分析简化收入方程要素价格弹性的非正性来区分垄断与其他市场结构。
This paper develops a very general test for "monopoly." Using standard comparative statics analysis, the authors derive testable restrictions on the firm's reduced-form revenue equation which must be satisfied by any profit-maximizing firm whose choices are not affected by either strategic interactions or the threat of entry. For such an unfettered monopolist, the sum of the factor price elasticities of the reduced-form revenue equation must be nonpositive. The set of interesting alternative hypotheses is not empty. The authors develop simple models of oligopolistic, competitive, and monopolistically-competitive markets for which this test statistic may take on positive values. Copyright 1987 by Blackwell Publishing Ltd.