The author considers the problem of implementation when a principal hires many agents and is not able to monitor their actions. He distinguishes two cases: (1) when actions are mutually observable among agents; and (2) when actions are not observable. In (1), there is a mechanism in which th e...

The author analyzes renegotiation in a hidden action principal-agent model. Contract renegotiation offers are made by the agent. A refinement is imposed on the principal's beliefs: if precisely one action is optimal with respect to both the principal's and the agent's contracts, the principal...