Optimal sales contracts with withdrawal rights

We introduce ex post participation constraints in the standard sequential screening model. This captures the presence of consumer withdrawal rights as, for instance, mandated by EU regulation of "distance sales contracts". With such additional constraints, the optimal contract is static and, unlike with only ex ante participation constraints, does not elicit the agent's information sequentially. With ex post participation constraints it is insufficient to consider only local incentive constraints. We develop a novel technique to identify the relevant global constraints.