A Model of Market Power in Customer Markets
构建了一个研究客户锁定导致动态竞争的模型，推导出平均均衡加成与赫芬达尔指数的闭式关系，可用于分析动态环境中的企业并购。
We develop a model for studying dynamic competition in environments with frictions that lead to partial lock‐in of customers to products. The dynamic aspects associated with customer retention and acquisition introduce pricing incentives that do not exist in more traditional, static product markets. The proposed model, while highly stylized, maintains certain symmetry properties that allow us to obtain equilibrium existence and uniqueness. We then study the comparative statics of the model and derive a closed‐form relationship between average equilibrium markups and the Herfindahl index. We illustrate how the model can be used by analyzing mergers in such a dynamic environment.