Selecting Cheap-Talk Equilibria
在Crawford-Sobel战略信息传递模型中识别出一个简单条件NITS（无分离激励），该条件能选出唯一均衡，并讨论了其在其他廉价谈话模型中的应用。
There are typically multiple equilibrium outcomes in the Crawford-Sobel (CS) model of strategic information transmission. This paper identifies a simple condition on equilibrium payoffs, called NITS (no incentive to separate), that selects among CS equilibria. Under a commonly used regularity condition, only the equilibrium with the maximal number of induced actions satisfies NITS. We discuss various justifications for NITS, including perturbed cheap-talk games with nonstrategic players or costly lying. We also apply NITS to other models of cheap talk, illustrating its potential beyond the CS framework.