1[3]Akerlof,G.(1970),The Marketfor Lemons.Quality Uncertainty and the Market Mechanism,Quarterly Journal of Economics,Vol.84,p485-500.(4]Rothschild M.and J.Stiglitz(1976),'Equilibrium in competitive Insurance Markets;AnEssay on the economics of Imperfect Information',Quarterly Journal of Economics vol.95:629-649.
2[5]SpenceM.(1973),Job Marketing signaling,Quarterly Journal of Economics Vol.87:355-374.
