Gregory Lewis and Pat Bajari, "Moral Hazard, Incentive Contracts, and Risk: Evidence from Procurement," Review of Economic Studies 81 (2014), 1201-1228. Pat Bajari, Christina Dalton, Han Hong, and Ahmed Khwaja, "Moral Hazard, Adverse Selection and Health Expenditures: A Semiparametric Analysis", RAND Journal of Economics 45 (2014), 747-763. Pat Bajari, Stephanie Houghton, and Steven Tadelis, "Bidding for Incomplete Contracts: An Empirical Analysis of Adaptation Costs." American Economic Review 104 (2014), 1288-1319.