5Rothschild M and Stiglitz J.Equilibrium in competitive insurance markets:an essay on the economic of imperfect information[J].Quarter Journal of Economic,1976,90:629-650.
6Mario J,Miranda and Joseph W G.System risk,reinsurance and the failure of crop insurance markets[J].American Journal of Agricultural Economic,1997,79:206-215.
7John D and Robert J M.Crop Insurance under catastrophic risk[J].American Journal of Agricultural Economic,2000,82(4):842-855.