Market Power and Information Revelation in Dynamic Trading
研究动态交易中信息不对称下的策略行为，发现卖家数量与竞争强度共同决定信息是否充分揭示。对理解市场势力如何影响信息传递有参考价值。
We study a strategic model of dynamic trading where agents are asymmetrically informed over common value sources of uncertainty. There is a continuum of uninformed buyers and a finite number of sellers, some of them informed. When there is only one seller, full information revelation never occurs in equilibrium and the only information transmission happens in the first period. The outcome with n sellers depends both on the structure of sellers� information and the intensity of competition among them allowed by the market rules. We show that the latter plays an even more important role. With intense competition (absence of clienteles), information is fully and immediately revealed to the buyers in every equilibrium for n large enough, both when all sellers are informed and when only one seller is informed. On the other hand, with a less intense form of competition (presence of clienteles), collusive equilibria, where information is never revealed, also exist, whatever the number of sellers. Moreover, when only one seller is informed, for many parameter configurations there are no equilibria with full information revelation, for any n.