The Subprime Mortgage Crisis: Underwriting Standards, Loan Modifications and Securitization∗ Laurence Wilse-Samsony February 2010 Abstract This is a survey of some literature on things that have been going on in housing mainly. Because it’s interesting. I highlight some aspects of the bubble, then some causes of the crash. I add some notes on the mortgage finance industry, and a little bit about the role of securitization in the crisis, and in posing hurdles for resolving the crisis. Those familiar with this area will be familiar with what I write about. Those not might find better surveys elsewhere. So you’ve been warned. Keywords: housing; securitization; subprime. ∗Notes on institutional detail written for personal edification. Thanks to Patrick Bolton for helpful and kind comments.
[email protected] 2 1. Introduction This paper is a survey of some of the literature on the subprime mortgage crisis. I focus on two aspects of the debate around securitization. First, I consider securitization as a possible mechanism for a decline in underwriting standards. Second, I review some evidence about its role in inhibiting the restructuring of loans through modification. These aspects are related, since creating a more rigid debt structure can facilitate bet- ter risk management and permit the greater extension of credit. However, it can also result in inefficiencies, through externalities on non-contracting parties. This might justify intervention ex post (Bolton and Rosenthal, 2002 [7]). I then consider some of the recent government modification programs and their problems. A concluding sec- tion tentatively suggests topics for research. We begin by outlining the shape of the non-prime mortgage market by way of back- ground, tracing its rapid expansion from the mid-1990s, but in particular its rapid de- velopment since the turn of the century.