I extend Myerson's (1981) ironing technique to more general objective functions. The approach can be used to solve quasilinear principal-agent models with a one-dimensional type in the general case where the monotonicity constraint implied by incentive compatibility may be binding at the...

I study the properties of optimal long-term contracts in an environment in which the agent's type evolves stochastically over time. The model stylizes a buyer-seller relationship but the results apply quite naturally to many contractual situations including regulation and optimal...