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Under the consideration of simply default risk,mortgage losses are divided into intentional default loss and an unintentional default loss,intentional default loss embraces prepayment default loss and loss due to Non-Performing Loans.Constructing a default loss pricing model,mortgage weighted (guide) rate is given,take liquidity risk and other risks as adjustment factor.the total risk before and after adjustment are equal theoretically,the curve equation provides a readjustable region.Market equilibrium interest rate is figured out by simultaneousness that the preference is function of adjustment factor.On this basis,this paper will design housing mortgage insurance pattern for universal insurance and property insurance,that is commercial banks transfer intentional default risk to insurance company,owner purchase property insurance according to losses calculated,and the owner also must buy universal insurance,according to the commercial bank interest rate curve after deducting unintentional default risk the premium of insurance company increases,the owner of the reimbursement pressure reduces,the default preference decreases.