We introduce an analytical framework close to the canonical model of platform competition investigated by Rochet and Tirole (2006) to study pricing decisions in two-sided markets when two or more platforms are needed simultaneously for the successful completion of a transaction. The model...

We use a multi-task principal-agent model with moral hazard to study environmental regulation of a private agent by an EPA that can also allocate its budget to an alternative project with environmental benefits. In a first possible optimum, the EPA imposes a flat fine that exhausts the agent's...

This paper verifies the robustness of Dixit's claim that common agency problems in the public sector can be solved by restrictions on the incentive schemes that government agencies can develop for the subordinates of other departments. In our model, the outside principal (for instance, an...