Purchasing health care services from providers with unknown altruism
Cost-sharing rules for paying physicians have been advanced as a way of generating incentives for the provision of quality care while recognizing their potential negative effects on production efficiency. However, the optimal sharing rate typically depends on the degree to which the physician acts in the interest of the patient, what we identify as the physician's altruism. Since the degree of altruism is likely to vary across physicians, and to be private information, the standard rules for setting the cost-sharing rate are unlikely to be optimal. This paper derives conditions for the optimal non-linear cost-sharing mechanism in the presence of asymmetric information about altruism, and shows how it can sometimes be implemented through a menu of linear cost-sharing schemes. The model can be used to rationalize the way some specialist physicians are paid in Australian hospitals.
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