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Borrower Credit and the Valuation of Mortgage-Backed Securities

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  • Francis A. Longstaff

Abstract

We study the valuation of mortgage-backed securities when borrowers may have to refinance at premium rates because of their credit. The optimal refinancing strategy often results in prepayment being delayed significantly relative to traditional models. Furthermore, mortgage values can exceed par by much more than the cost of refinancing. Applying the model to an extensive sample of mortgage-backed security prices, we find that the implied credit spreads that match these prices closely parallel borrowers' actual spreads at the origination of the mortgage. These results suggest that models that incorporate borrower credit into the analysis may provide a promising alternative to the reduced-form prepayment models widely used in practice. Copyright 2005 by the American Real Estate and Urban Economics Association

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  • Francis A. Longstaff, 2005. "Borrower Credit and the Valuation of Mortgage-Backed Securities," Real Estate Economics, American Real Estate and Urban Economics Association, vol. 33(4), pages 619-661, December.
  • Handle: RePEc:bla:reesec:v:33:y:2005:i:4:p:619-661
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    1. repec:wsi:ijtafx:v:20:y:2017:i:08:n:s0219024917500509 is not listed on IDEAS
    2. Koijen, Ralph S.J. & Hemert, Otto Van & Nieuwerburgh, Stijn Van, 2009. "Mortgage timing," Journal of Financial Economics, Elsevier, vol. 93(2), pages 292-324, August.
    3. Eugene Amromin & Jennifer Huang & Clemens Sialm & Edward Zhong, 2010. "Complex mortgages," Working Paper Series WP-2010-17, Federal Reserve Bank of Chicago.
    4. Aytek Malkhozov & Philippe Mueller & Andrea Vedolin & Gyuri Venter, 2016. "Mortgage Risk and the Yield Curve," Review of Financial Studies, Society for Financial Studies, vol. 29(5), pages 1220-1253.
    5. Aytek Malkhozov & Philippe Mueller & Andrea Vedolin & Gyuri Venter, 2013. "Mortgage Hedging in Fixed Income Markets," FMG Discussion Papers dp722, Financial Markets Group.
    6. Nicholas Sharp & David Newton & Peter Duck, 2008. "An Improved Fixed-Rate Mortgage Valuation Methodology with Interacting Prepayment and Default Options," The Journal of Real Estate Finance and Economics, Springer, vol. 36(3), pages 307-342, April.
    7. Nicholas Sharp & Paul Johnson & David Newton & Peter Duck, 2009. "A New Prepayment Model (with Default): An Occupation-time Derivative Approach," The Journal of Real Estate Finance and Economics, Springer, vol. 39(2), pages 118-145, August.
    8. Lars Stentoft, 2013. "American option pricing using simulation with an application to the GARCH model," Chapters,in: Handbook of Research Methods and Applications in Empirical Finance, chapter 5, pages 114-147 Edward Elgar Publishing.
    9. Arthur Korteweg & Morten Sorensen, 2012. "Estimating Loan-to-Value and Foreclosure Behavior," NBER Working Papers 17882, National Bureau of Economic Research, Inc.

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