Research in Progress (RIP): "Private provision of social insurance: drug-specific price elasticities and pricing in Medicare Part D"
"Private provision of social insurance: drug-specific price elasticities and pricing in Medicare Part D"
Please note: All research in progress seminars are off-the-record. Any information about methodology and/or results is embargoed until publication.
Abstract:
Although optimal social insurance theory suggests that consumer cost-sharing should increase in a drug's elasticity of demand, publicly provided drug coverage typically involves uniform cost-sharing across drugs. Does the private market behave differently? We examine this question in the context of Medicare Part D. To do so, we first exploit the famous donut hole – at which insurance becomes discontinuously generous at the margin – together with detailed claim-level data for about 2 million beneficiaries to estimate price elasticities of demand for almost 200 different common drugs and 80 different common therapeutic classes. We document substantial heterogeneity in the price elasticity of demand across drugs and diseases, with an average elasticity estimate across drugs of -0.22 and a standard deviation of 0.5. Drawing on additional detail on the contract design of hundreds of Medicare Part D private plans, we document - in contrast to pricing in public prescription drug plans - substantial heterogeneity in the cost-sharing rate private plans charge for different drugs. We find that private plans vary cost-sharing in the direction of the social optimum: charging higher consumer coinsurance for drugs and classes with more elastic demand. Results from a highly stylized model are consistent with the empirical findings: profit maximizing private firms have incentives to vary cost-sharing across drugs in the socially efficient direction. Our findings suggest that benefit design may be more efficient in privately rather than publicly provided insurance.
Maria Polyakova
Encina Commons,
615 Crothers Way Room 182,
Stanford, California 94305-6006
Maria Polyakova, PhD, is Associate Professor of Health Policy at Stanford School of Medicine and Associate Professor (by courtesy) in the Department of Economics at Stanford University, where she is also a Senior Fellow at the Stanford Institute for Economic Policy Research (SIEPR). She is a Research Associate at the National Bureau of Economic Research (NBER) and serves as an Editor of the Journal of Health Economics. Her research spans many areas of health economics, including health insurance, healthcare labor markets, and individual decision-making in health and healthcare. A unifying thread is evaluating whether markets and government policy effectively serve individuals and families or introduce distortions. Her ongoing work focuses on how families navigate prolonged health shocks. Maria received her BA in Economics & Mathematics and German Studies (with a concentration in History) from Yale University in 2008 and her PhD in Economics from MIT in 2014.
Booseung Chang joins the Walter H. Shorenstein Asia-Pacific Research Center as Shorenstein Postdoctoral Fellow for the 2015-16 year. His research interests span comparative foreign policy and policymaking process.