We revisit the private value informed principal model as introduced in Maskin and Tirole (1990). We improve on their model in two dimensions. First, we show that their results about efficiency and uniqueness of the equilibrium still hold in a context in which the principal is constrained to...

In this paper we address the question of collusion in mechanisms under asymmetric information. We develop a methodology to analyze collusion as an informed principal problem. First, if collusion occurs after the agents accept or reject the principal's offer, the dominant-strategy implementation...