2[4]M.Rothschild and J.Stiglitz,1976.Equilibrium in Competitive Insurance Markets:An Essay on the Economics of Imperfect Information,Quarterly Journal of Economics,90(4),630-649.
3[5]J.E.Stiglitz,A.Weiss,1981:Credit Rationing in Markets with Imperfect Information,The American Economic Review,71(3),393～410
