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STICERD Economic Theory Seminars

FRIDAY SEMINAR 12:30PM: Moral Hazard and Disappointment Aversion

Alex Gershkov (Hebrew University of Jerusalem), joint with Benny Moldovanu and Philipp Strack

Friday 09 October 2026 12:30 - 14:00

SAL 3.05, 3rd Floor Conference Room, Sir Arthur Lewis Building, LSE, 32 Lincoln's Inn Fields, London WC2A 3PH


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About this event

We study the classical moral-hazard problem with hidden actions where both the agent and the principal are disappointment - (and risk-) averse in the sense of Gul 1991 and have a piecewise linear utility over monetary outcomes. The optimal contract for the case where only the agent is disappointment averse consists of three levels of payment: a standard fixed wage - equivalent to the agent's total perceived compensation including bonus and penalties - for middle outcomes, a (possible random) penalty wage/termination clause for low outcomes, and a bonus paid only for the highest outcome. This structure is commonly observed in practice and is in sharp contrast both to the results obtained under expected utility (e.g., complex schemes that finely depend on the model's primitives) and under other departures from expected utility (e.g., binary bonus schemes under loss aversion a la Koszegi-Rabin 2006). When both agent and principal are disappointment- and risk-averse, the optimal contract continues to be piecewise linear with some discrete jumps but consists of five distinct parts: the penalty/basic wage/bonus scheme described above and, in addition, two separate areas where the agent's pay is linearly increasing in outcome.