A repeated moral hazard setting in which the Principal privately observes the Agents output is studied. It is shown that there is no loss from restricting the analysis to contracts in which the Agent is supposed to exert e¤ort every period, receives a constant e ¢ ciency wage and no feedback until he is \u85red. The optimal contract for a nite horizon is characterized, and shown to require burning of resources. These are only burnt after the worst possible realization sequence and the amount is independent of both the length of the horizon and the discount factor (). For the in\u85nite horizon case a family of \u85xed interval review contracts is characterized and shown to achieve rst best as ! 1. The optimal contract when << 1 is p...