The study of organizational choice is crucial to the understanding of firms' efficiency. We consider this issue applied to contracts on health services. In particular, we analyze the circumstances under which it is better for an insurer to contract with both the hospital and the physician...

We propose a model based on competitive markets in order to analyze an economy with several principals and agents. We model the principal-agent economy as a two-sided matching game and characterize the set of stable outcomes of this principal-agent matching market. A simple mechanism to...