Dynamic Moral Hazard and Project Completion

We analyse a simple model of dynamic moral hazard in which there is a clear and tractable trade-off between static and dynamic incentives. In our model, a principal wants an agent to complete a project. The agent undertakes unobservable effort, which affects in each period the probability that the project is completed. The principal pays only on completion of the project. We characterise the contracts that the principal sets, with and without commitment. We show that with full commitment, the contract involves the agent’s value and wage declining over time, in order to give the agent incentives to exert effort.