We provide two examples in a pure moral hazard setting with two principals and two agents. Example 1 shows that a strongly robust equilibrium in simple (direct) mechanisms can no longer be sustained as an equilibrium when a principal can deviate to an indirect communication scheme. Conversely,...

This paper examines the role of direct mechanisms in common agency games. We focus on pure strategies and deterministic contracts and show how the introduction of a separability condition on the preferences of the agent is sufficient for the Revelation Principle to hold in in this setting, when...

This note presents a counter-example to Theorems 3 and 4 in Peters (2003, J. Eco. Theory) and suggests that indifference of the single agent with respect to principals' offers plays an important role in the failure of the Revelation Principle in Common Agency games. In addition we provide a new...