Credit Decision Model and Mechanism with Default Risk Parameter

Default risk is an important reason led to credit risk for a bank. In this article, the size of default risk can be quantized and described by the size of the default probability. At first, we discuss the influence of existence of the default probability on the expected return of the bank. Then we modify the ordinary credit decision-making contract γ = (r,C,q), where only interest rate, collateral and credit rationing were considered, to a new credit decision-making contract γ =(s(r),C,q) by considering the default probability. We establish a credit decision model including default risk parameter and give both the corresponding credit decision mechanism and a credit decision mechanism under a non-rationing loan. We also discuss the condition of the loan rejected by the bank under the corresponding condition. Finally, we give examples for applications.