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Working Paper
Did prepayments sustain the subprime market?
This paper demonstrates that the reason for widespread default of mortgages in the subprime market was a sudden reversal in the house price appreciation of the early 2000's. Using loan-level data on subprime mortgages, we observe that the majority of subprime loans were hybrid adjustable rate mortgages, designed to impose substantial financial burden on reset to the fully indexed rate. In a regime of rising house prices, a financially distressed borrower could avoid default by prepaying the loan and our results indicate that subprime mortgages originated between 1998 and 2005 had extremely ...
Working Paper
Where's the smoking gun? a study of underwriting standards for US subprime mortgages
The dominant explanation for the meltdown in the US subprime mortgage market is that lending standards dramatically weakened after 2004. Using loan-level data, we examine underwriting standards on the subprime mortgage originations from 1998 to 2007. Contrary to popular belief, we find no evidence of a dramatic weakening of lending standards within the subprime market. We show that while underwriting may have weakened along some dimensions, it certainly strengthened along others. Our results indicate that (average) observable risk characteristics on mortgages underwritten post-2004 would have ...
Working Paper
Credit scoring and loan default
A metric of credit score performance is developed to study the usage and performance of credit scoring in the loan origination process. We examine the performance of origination FICO scores as measures of ex ante borrower creditworthiness using loan-level data on ex post performance of subprime mortgages. Parametric and nonparametric estimates of credit score performance reveal different trends, especially on originations with low credit scores. The data suggest a trend of increased emphasis on higher credit scores accompanying a trend of increased riskiness in other origination attributes. ...
Working Paper
Credit scoring and loan default
This paper introduces a measure of credit score performance that abstracts from the influence of ?situational factors.? Using this measure, we study the role and effectiveness of credit scoring that underlied subprime securities during the mortgage boom of 2000-2006. Parametric and nonparametric measures of credit score performance reveal different trends, especially on originations with low credit scores. The paper demonstrates an increasing trend of reliance on credit scoring not only as a measure of credit risk but also as a means to offset other riskier attributes of the origination. This ...