Kasper Roszbach: Dept. of Economics, Stockholm School of Economics, Postal: P.O. Box 6501, SE-113 83 Stockholm, Sweden
Abstract: To evaluate loan applicants, banks use a large variety of systems. The objective of such credit scoring models typically is to minimize default rates or the number of incorrectly classified loans. Thereby they fail to take into account that loans are multiperiod contracts. From a utility maximizing perspective it is not only important to know if but also when a loan will default. In this paper a Tobit model with a variable censoring threshold and sample selection effects is estimated for (1) the decision to provide a loan or not and (2) the survival of granted loans. The model is shown to be an affective tool to separate applicants with short survival times from those with long survivals The bank´s loan provision process is shown to be inefficient. Loans are granted in a way that conflicts with both default risk minimization and survival time maximization. There is thus no trade-off between higher default risk and higher return in the policy of banks.
28 pages, September 29, 1998
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