TY - RPRT CY - Toulouse, France ID - publications43614 UR - http://tse-fr.eu/pub/125695 A1 - Cremer, Helmuth A1 - Lozachmeur, Jean-Marie Y1 - 2021/05// N2 - This paper studies a market for a medical product in which there is perfect competition among health insurers, while the good is sold by a monopolist. Individuals diĀ¤er in their severity of illness and there is ex post moral hazard. We consider two regimes : one in which insurers use coinsurance rates (ad valorem reimbursements) and one in which insurers use copayments (specic reimbursements). We show that the induced equilibrium with copayments involves a lower producer price and a higher level of wel- fare for consumers. This results provides strong support for a reference price based reimbursement policy. PB - TSE Working Paper T3 - TSE Working Paper KW - Ex post moral hazard KW - health insurance competition KW - copayments KW - imper- KW - fect competition M1 - working_paper TI - Coinsurance vs. copayments : reimbursement rules for a monopolistic medical product with competitive health insurers AV - public EP - 17 ER -