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An Assessment of Basel II Procyclicality in Mortgage Portfolios

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  • Jesús Saurina
  • Carlos Trucharte

Abstract

In this paper we develop a probability of default (PD) model for mortgage loans, taking advantage of the Spanish Credit Register, a comprehensive database on loan characteristics and credit quality. From that model, we calculate different types of PDs: point in time, PIT, through the cycle, TTC, average across the cycle and acyclical. Then, we compare capital requirements coming from the different Basel II approaches. We show that minimum regulatory capital under Basel II can be very sensitive to the risk measurement methodology employed. Thus, the procyclicality of regulatory capital requirements under Basel II is an open question, depending on the way internal rating systems are implemented and their output is utilised. We focus on the mortgage portfolio since it is one of the most under researched areas regarding the impact of Basel II and because it is one of the most important banks’ portfolios.
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  • Jesús Saurina & Carlos Trucharte, 2007. "An Assessment of Basel II Procyclicality in Mortgage Portfolios," Journal of Financial Services Research, Springer;Western Finance Association, vol. 32(1), pages 81-101, October.
    • Handle: RePEc:kap:jfsres:v:32:y:2007:i:1:p:81-101
    DOI: 10.1007/s10693-007-0008-1
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    More about this item

    Keywords

    Procyclicality; Basel II; rating systems; mortgages; E32; G18; G21;
    All these keywords.

    JEL classification:

    • E32 - Macroeconomics and Monetary Economics - - Prices, Business Fluctuations, and Cycles - - - Business Fluctuations; Cycles
    • G18 - Financial Economics - - General Financial Markets - - - Government Policy and Regulation
    • G21 - Financial Economics - - Financial Institutions and Services - - - Banks; Other Depository Institutions; Micro Finance Institutions; Mortgages

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