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STICERD Economic Theory Seminars

Incomplete Information under Complete Contracts

Qianjun Lyu (Universidad Carlos III de Madrid), joint with Gregorio Curello and Yimeng Zhang

Thursday 22 October 2026 15:30 - 17:00


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About this event

We study a moral hazard model with a risk-neutral principal and risk-neutral agent, in which the output is stochastically determined by an agent's hidden effort and an uncertain state. We examine how the contractibility of ex-post state observations shapes the principal's optimal information provision ex-ante. The principal faces a trade-off: finer information allows for effort levels to be tailored to the realized state (information efficiency), whereas coarser information enables the principal to aggregate the agent's incentives across states to reduce agency costs (cost-saving effect). Under complete contracts where the state is ex-post contractible, the cost-saving effect is first order, and it always dominates the second-order information efficiency. Conversely, under incomplete contracts where the state is not ex-post contractible, the cost-saving effect becomes second order, and its magnitude can be smaller than the second-order information efficiency. With binary output, if the production function is additive-separable, then complete information is optimal under incomplete contracts, while no information is optimal under complete contracts. The same insight preserves with a risk-averse agent.