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The Consequences of Mortgage Credit Expansion: Evidence from the 2007 Mortgage Default Crisis

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  • Atif Mian
  • Amir Sufi

Abstract

We demonstrate that a rapid expansion in the supply of mortgages driven by disintermediation explains a large fraction of recent U.S. house price appreciation and subsequent mortgage defaults. We identify the effect of shifts in the supply of mortgage credit by exploiting within-county variation across zip codes that differed in latent demand for mortgages in the mid 1990s. From 2001 to 2005, high latent demand zip codes experienced large relative decreases in denial rates, increases in mortgages originated, and increases in house price appreciation, despite the fact that these zip codes experienced significantly negative relative income and employment growth over this time period. These patterns for high latent demand zip codes were driven by a sharp relative increase in the fraction of loans sold by originators shortly after origination, a process which we refer to as "disintermediation." The increase in disintermediation-driven mortgage supply to high latent demand zip codes from 2001 to 2005 led to subsequent large increases in mortgage defaults from 2005 to 2007. Our results suggest that moral hazard on behalf of originators selling mortgages is a main culprit for the U.S. mortgage default crisis.

Suggested Citation

  • Atif Mian & Amir Sufi, 2008. "The Consequences of Mortgage Credit Expansion: Evidence from the 2007 Mortgage Default Crisis," NBER Working Papers 13936, National Bureau of Economic Research, Inc.
  • Handle: RePEc:nbr:nberwo:13936
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    References listed on IDEAS

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    1. Charles Himmelberg & Christopher Mayer & Todd Sinai, 2005. "Assessing High House Prices: Bubbles, Fundamentals and Misperceptions," Journal of Economic Perspectives, American Economic Association, vol. 19(4), pages 67-92, Fall.
    2. Bengt Holmstrom & Jean Tirole, 1997. "Financial Intermediation, Loanable Funds, and The Real Sector," The Quarterly Journal of Economics, Oxford University Press, vol. 112(3), pages 663-691.
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    4. Edward L. Glaeser & Joseph Gyourko, 2005. "Urban Decline and Durable Housing," Journal of Political Economy, University of Chicago Press, vol. 113(2), pages 345-375, April.
    5. Hurst, Erik & Stafford, Frank, 2004. "Home Is Where the Equity Is: Mortgage Refinancing and Household Consumption," Journal of Money, Credit and Banking, Blackwell Publishing, vol. 36(6), pages 985-1014, December.
    6. Souphala Chomsisengphet & Anthony Pennington-Cross, 2006. "The evolution of the subprime mortgage market," Review, Federal Reserve Bank of St. Louis, issue Jan, pages 31-56.
    7. Diamond, Douglas W, 1991. "Monitoring and Reputation: The Choice between Bank Loans and Directly Placed Debt," Journal of Political Economy, University of Chicago Press, vol. 99(4), pages 689-721, August.
    8. Yuliya Demyanyk & Otto Van Hemert, 2007. "Understanding the subprime mortgage crisis," Supervisory Policy Analysis Working Papers 2007-05, Federal Reserve Bank of St. Louis.
    9. Jeremy C. Stein, 1995. "Prices and Trading Volume in the Housing Market: A Model with Down-Payment Effects," The Quarterly Journal of Economics, Oxford University Press, vol. 110(2), pages 379-406.
    10. Stiglitz, Joseph E & Weiss, Andrew, 1981. "Credit Rationing in Markets with Imperfect Information," American Economic Review, American Economic Association, vol. 71(3), pages 393-410, June.
    11. Mark Doms & Frederick T. Furlong & John Krainer, 2007. "Subprime mortgage delinquency rates," Working Paper Series 2007-33, Federal Reserve Bank of San Francisco.
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    More about this item

    JEL classification:

    • E44 - Macroeconomics and Monetary Economics - - Money and Interest Rates - - - Financial Markets and the Macroeconomy
    • E51 - Macroeconomics and Monetary Economics - - Monetary Policy, Central Banking, and the Supply of Money and Credit - - - Money Supply; Credit; Money Multipliers
    • G21 - Financial Economics - - Financial Institutions and Services - - - Banks; Other Depository Institutions; Micro Finance Institutions; Mortgages
    • L85 - Industrial Organization - - Industry Studies: Services - - - Real Estate Services
    • O51 - Economic Development, Innovation, Technological Change, and Growth - - Economywide Country Studies - - - U.S.; Canada
    • R21 - Urban, Rural, Regional, Real Estate, and Transportation Economics - - Household Analysis - - - Housing Demand

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