Asymmetric Information in Health Insurance: Evidence from the National Medical Expenditure Survey
利用国家医疗支出调查数据，构建结构模型检验健康保险市场中的逆向选择，发现没有证据支持信息不对称的存在。
Adverse selection is perceived to be a major source of market failure in insurance markets. There is little empirical evidence on the extent of the problem. We estimate a structural model of health insurance and health care choices using data on single individuals from the NMES. A robust prediction of adverse-selection models is that riskier types buy more coverage and, on average, end up using more care. We test for unobservables linking health insurance status and health care consumption. We find no evidence of informational asymmetries.