Classical analysis of health insurance markets often focuses on adverse selection, which creates a direct externality between the enrollees of the same health plan: under an imperfect risk adjustment, the higher the risks of my co-enrollees, the higher my cost of insurance. This has lead to the...

We study competition in two sided markets with common network externality rather than with the standard inter-group e¤ects. This type of externality occurs when both groups benefit, possibly with different intensities, from an increase in the size of one group and from a decrease in the size of...

We study the effect of UI benefits in a typical developing country where the informal sector is sizeable and persistent. In a partial equilibrium environment we characterize the stationary equilibrium of an economy where policyholders may be employed in the formal sector, short-run unemployed...

This paper analyzes the three-party contracting problem among the payer, the patient and the physician when the patient and the physician may collude to exploit mutually beneficial opportunities. Under the hypothesis that side transfer is ruled out, we analyze the mechanism design problem when...