My research interests include the fields of Industrial Organization and Health Economics.

Download Research Statement (PDF)


Job Market Paper

Bargaining in Markets with Exclusion: An Analysis of Health Insurance Networks

Abstract: This paper explores the common story that insurance companies exclude hospitals from their networks to gain bargaining leverage in contract negotiations. I propose a novel model of price formation in a bilateral oligopoly setting where the networks are endogenous. The endogeneity of its network allows the insurer to threaten to exclude hospitals. Exclusion is an equilibrium outcome; the insurer offsets the loss of premiums from a less valuable network by reimbursing hospitals less. I estimate this model using data from the Colorado All-Payer Claims Database. I find, using a counterfactual analysis, that restricting insurers’ ability to exclude would lead to 50 percent higher prices negotiated between hospitals and insurers, while the Nash-in-Nash framework used in the hospital-insurer bargaining literature finds prices would fall by 36 percent.


Work in Progress

“Shoppers’ Response To An On-Shelf Nutrition Labelling System in Supermarkets in Ontario, Canada” Hobin E., Bollinger B., Sacco J., Liebman E., Vanderlee L., Zuo F., Rosella L., L’abbe M., Manson H. and Hammond D.



“The Role of Government Reimbursement in Drug Shortages.” Yurukoglu A., Liebman E., Ridley D., Forthcoming in American Economic Journal: Economic Policy NBER Working Paper version

“Guidelines for Measuring Disease Episodes: An Analysis of the Effects on the Components of Expenditure Growth.” Dunn A. Liebman E., Rittmueller L., and Shapiro A.H., Forthcoming in Health Services Research

“No Shot: Shortages in the U.S. Vaccine Market” Ridley D.B., Bei X, and Liebman E. Health Affairs. 35(2): 235-241, Feb 2016.

“Implications of Utilization Shifts on Medical-Care Price Measurement” Dunn A., Liebman E., and Shapiro A.H. Health Economics. 24(5): 539-557, May 2015.

“Geographic Variation in Commercial Medical Care Expenditures: A Decomposition Between Price and Utilization.” Dunn A., Shapiro A.H., Liebman E. Journal of Health Economics. 32(6): 1153-1165, Dec 2013.

“Medical Care Price Indexes for Patients with Employer-Provided Insurance: Nationally Representative Estimates from MarketScan Data” Dunn A., Liebman E., Pack S. and Shapiro A. H. Health Services Research. 48 (3): 1173-90, Oct 2012.

“Household Consumption Expenditures for Medical Care: An Alternate Presentation.” Aizcorbe A., Liebman E., Cutler D.M. and Rosen A. Survey of Current Business. 92: 34-48, June 2012.

“Measuring Health Care Costs of Individuals with Employer-Sponsored Health Insurance in the U.S.: A Comparison of Survey and Claims Data.” Aizcorbe A., Liebman E., Pack S., Cutler D.M., Chernew M.E. and Rosen A. Statistical Journal of the International Association for Official Statistics. 28(1-2): 43-51, 2012.