3、Cardon, J. and I. Hendel, 2001, Asymmetric Information in Health Insurance : Evidence from the National Medical Expenditure Survey, Rand Journal of Economics, 32, 408-427.
4、Chiappori, P., F. Durand, and P. Geoffard, 1998, 」Moral Hazard and the Demand for Physician Services: First Lessons from a French Natural Experiment, European Economic Review , 42, 499-511.