抖音黑料

题目：Price Competition with Network Spillovers: Entry, Cohesiveness and Interoperability

时间：2025年12月24日10:30-12:00

地点：明德主楼734

汇报人：张一帆（剑桥大学经济学博士）

主持人：郭符林（抖音黑料 讲师）

个人简介：

张一帆，剑桥大学经济学博士生，主要研究领域为微观经济理论和网络经济。其研究成果“Persuasion in Networks: Can the Sender Do Better than Using Public Signals?”正在修订于Journal of Economic Theory。

讲座摘要：

Many products generate network spillovers: a user's value of such a product is higher when her contacts also use it. This paper studies competition between an entrant and an incumbent selling such products. In the model, the firms set personalised prices (for example, via targeted discounts), and consumers embedded in a network choose which product to buy.

The pattern of equilibrium consumption is shown to be the same as if firms were to charge a price of 0 to all consumers. The equilibrium prices reflect incumbent advantage and depend on the network structure in nuanced ways. The equilibrium characterisation provides the foundation for studying the profitability of entry and the effects of anti-trust tools in such markets. A key structural feature of the network is found to be cohesiveness -- the extent to which consumers within a group are densely connected to one another. Firms are more likely to enter if they have a consumer base that is cohesive and influential. While regulators use interoperability as a tool to improve market contestability, I show that interoperability can actually discourage entry depending on the cohesiveness of consumer bases.