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 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...