重叠市场商店集中现象分析

Concentration of Competing Retail Stores of Overlapped Markets

销售类似商品的商店集中于一处是一种普遍现象 ,为分析这一现象 ,提出一个简单的两维空间竞争模型 ,而消费者的偏好是不确定的。由于商店的集中给消费者带来了更多的选择 ,使得消费者有更多的机会挑选到他们满意的物品 ,这就是市场规模效应。另一方面 ,商店的集中也会带来激烈的价格竞争 ,这就是降价效应。二者之间的平衡是本论文的重点。

Geographical concentration of stores that sell similar commodities is pervasive. To analyze this phenomenon, this paper provides a simple two dimensional spatial competition model with consumer taste uncertainty. Given taste uncertainty, concentration of stores attracts more consumers since more variety means that a consumer has more chance of finding her favorite commodity(i.e. market size effect). On the other hand, concentration of stores leads to fiercer price competition(i.e. price cutting effect). The trade off between these two effects is the focus of this paper. This paper analyzes concentration of competing retail stores of overlapped markets.