Competition Among the Big and the Small
Competition Among the Big and the Small
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DOI：
10.1111/j.1756-2171.2012.00168.x
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发表时间：
2009-08
期刊：
影响因子：
--
通讯作者：
K. Shimomura;Jacques-François Thisse
中科院分区：
文献类型：
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作者：
K. Shimomura;Jacques-François Thisse
许多行业都是由少数几家大公司和许多小企业组成的，大公司能够操纵市场结果，而小企业对市场的影响可以忽略不计。我们提供了一个概括了这两种市场结构的一般均衡框架。由于竞争更加激烈，大公司的进入通过缩小垄断竞争边缘而产生的市场扩张效应导致它们销售更多产品。此外，社会福利随着大公司的数量增加而增加，因为与进入有关的促进竞争效应主导了产品多样性的减少。
Many industries are made of a few big firms, which are able to manipulate the market outcome, and of a host of small businesses, each of which has a negligible impact on the market. We provide a general equilibrium framework that encapsulates both market structures. Due to the higher toughness of competition, the entry of big firms leads them to sell more through a market expansion effect generated by the shrinking of the monopolistically competitive fringe. Furthermore, social welfare increases with the number of big firms because the pro-competitive effect associated with entry dominates the resulting decrease in product diversity.