I study the general problem of a principal who desires to implement a given vector of actions and pay the agents according to a given compensation scheme. Previous work has provided mechanisms for implementation in various special cases. In this article, I fully characterize the set of action...

We study the implementation problem for exchange economies when agents can renegotiate the outcome assigned by the planner and can collude. We focus on the use of sequential mechanisms and present a simple sufficient condition for implementation with renegotiation in strong perfect equilibrium....