Changes in Concentration, Turbulence, and the Dynamics of Market Shares
Changes in Concentration, Turbulence, and the Dynamics of Market Shares
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集中度、动荡和市场份额动态的变化
DOI：
10.1162/003465300556977
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发表时间：
1997
影响因子：
8
通讯作者：
P. Geroski
中科院分区：
文献类型：
--
作者：
S. Davies;P. Geroski;P. Geroski
以往大多数关于产业结构动态的研究都强调集中度的变化，从而掩盖了竞争过程的本质。在这里，我们采用了一个随机企业增长模型，估计在英国。1979 - 1986年200多家主要公司的数据，得出关于市场份额稳定性和集中度变化的联合预测。我们发现，生存企业的市场份额的变化是集中度的主要影响，这是典型的相当稳定，尽管相当大的市场份额动荡。广告在市场份额的动态变化中起着重要作用，因此，它既影响集中度，也影响市场动荡。
Most previous studies of the dynamics of industry structure, by emphasizing changes in concentration, conceal much of the nature of underlying competitive processes. Here we employ a stochastic firm growth model, estimated on U.K. data of 19791986 for over 200 leading firms, to derive joint predictions about the stability of market shares and the change of concentration. We find that changes in the market shares of surviving firms are the dominant influence on concentration, which is typically fairly stable in spite of considerable market-share turbulence. Advertising plays a major role in the dynamics of market shares and, therefore, affects both concentration and turbulence.