Optimal communication to a group often entails a trade-off between precision of information conveyed and common understanding (or approximate common knowledge) of the information within the group. We argue that an understanding of this trade-off is central in many contexts, including central...

We consider the role of the common prior for robust implementation in an environment with interdependent values. Specifically, we investigate a model of public good provision which allows for negative and positive informational externalities. In the corresponding direct mechanism, the agents'...