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Endogenous/Exogenous Segmentation In The A-Irb Framework And The Pro-Cyclicality Of Capital: An Application To Mortgage Portfolios

Author

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  • Jose J. Canals-Cerda

Abstract

This paper investigates the pro-cyclicality of capital in the advanced internal ratings-based (A-IRB) Basel approach for retail portfolios and identifies the fundamental assumptions required for stable A-IRB risk weights over the economic cycle. Specifically, it distinguishes between endogenous and exogenous segmentation risk drivers and, through application to a portfolio of first mortgages, shows that risk weights remain stable over the economic cycle when the segmentation scheme is derived using exogenous risk drivers, while segmentation schemes that include endogenous risk drivers are highly pro cyclical. Also analyzed is the sensitivity of the A-IRB framework to model risk resulting from the selection, at the quantification stage, of a data sample period that does not include a period of significant economic downturn. The analysis illustrates important limitations and sensitivities of the A IRB framework and sheds light on the implicit restrictions embedded in recent regulatory guidance that underscore the importance of rating systems that remain stable over time and throughout business cycles.

Suggested Citation

  • Jose J. Canals-Cerda, 2017. "Endogenous/Exogenous Segmentation In The A-Irb Framework And The Pro-Cyclicality Of Capital: An Application To Mortgage Portfolios," Working Papers 17-9, Federal Reserve Bank of Philadelphia, revised 19 Apr 2017.
  • Handle: RePEc:fip:fedpwp:17-9
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    File URL: https://www.philadelphiafed.org/-/media/research-and-data/publications/working-papers/2017/wp17-09.pdf?la=en
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    References listed on IDEAS

    as
    1. Merton, Robert C, 1974. "On the Pricing of Corporate Debt: The Risk Structure of Interest Rates," Journal of Finance, American Finance Association, vol. 29(2), pages 449-470, May.
    2. Yongheng Deng & John M. Quigley & Robert Van Order, 2000. "Mortgage Terminations, Heterogeneity and the Exercise of Mortgage Options," Econometrica, Econometric Society, vol. 68(2), pages 275-308, March.
    3. Gordy, Michael B., 2003. "A risk-factor model foundation for ratings-based bank capital rules," Journal of Financial Intermediation, Elsevier, vol. 12(3), pages 199-232, July.
    Full references (including those not matched with items on IDEAS)

    More about this item

    Keywords

    mortgages; credit risk; Basel Accord; regulatory capital;

    JEL classification:

    • G33 - Financial Economics - - Corporate Finance and Governance - - - Bankruptcy; Liquidation
    • G32 - Financial Economics - - Corporate Finance and Governance - - - Financing Policy; Financial Risk and Risk Management; Capital and Ownership Structure; Value of Firms; Goodwill
    • G20 - Financial Economics - - Financial Institutions and Services - - - General

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