General equilibrium models of monopolistic competition: A new approach

General equilibrium models of monopolistic competition: A new approach
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DOI:
10.1016/j.jet.2006.10.001
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发表时间:
2007-09-01
影响因子:
1.6
通讯作者:
Murata, Yasusada
Murata, Yasusada
中科院分区:
经济学3区
文献类型:
--
作者:
Behrens, Kristian;Murata, Yasusada

文献摘要

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我们通过将功能可分离性的不同概念应用于效用最大化的同一组一阶条件来分析一类“大集团”张伯伦垄断竞争模型。我们表明,乘性拟可分离(MQS)函数产生“恒定相对风险厌恶”(CRRA),因此“恒定替代弹性”(CES)函数,而加性拟可分离(AQS)函数产生“恒定绝对风险厌恶”(CARA)函数。然后我们表明,CARA 规范揭示了以下新的亮点:(i)有利于竞争的效应,即,在大量竞争企业中,利润最大化的价格正在下降; (ii) 竞争极限,即当竞争企业的数量变得任意大时,利润最大化价格趋于边际成本。 (C) 2006 Elsevier Inc. 保留所有权利。
We analyze a class of 'large group' Chamberlinian monopolistic competition models by applying different concepts of functional separability to the same set of first-order conditions for utility maximization. We show that multiplicatively quasi-separable (MQS) functions yield 'constant relative risk aversion' (CRRA), and, therefore 'constant elasticity of substitution' (CES), functions, whereas additively quasi-separable (AQS) functions yield 'constant absolute risk aversion' (CARA) functions. We then show that the CARA specification sheds new light on: (i) pro-competitive cffects, i.e., profit-maximizing prices are decreasing in the mass of competing firms; and (ii) a competitive limit, i.e., profit-maximizing prices converge to marginal costs when the mass of competing firms becomes arbitrarily large. (C) 2006 Elsevier Inc. All rights reserved.