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Regulatory capital determination and Its implications for internal ratings-based credit risk model development and validation

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  • Cao, Honggao

Abstract

Focusing on the interconnections between the Basel regulatory capital formula and several well-specified statistical models, this working paper seeks to understand some of the important issues embedded in the Basel Accord. These include: Where does this formula come from? What risks does it try to capture? Why does the Basel Accord stipulate that the formula be implemented on a basis of homogeneous segments for retail exposures or similar risk ratings of wholesale obligors? Is there any desirable property on the number of loans for a segment (or obligor group)? Why is LGD treated as a constant as opposed to a random variable? When covering expected loss – and determined independently – how is the loss reserve related to the minimum regulatory capital? Answers to these questions have some important implications for Basel model development and validation.

Suggested Citation

  • Cao, Honggao, 2012. "Regulatory capital determination and Its implications for internal ratings-based credit risk model development and validation," MPRA Paper 46729, University Library of Munich, Germany, revised May 2013.
    • Handle: RePEc:pra:mprapa:46729
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    References listed on IDEAS

    as
    1. 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.
    2. 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.
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    JEL classification:

    • G1 - Financial Economics - - General Financial Markets
    • G18 - Financial Economics - - General Financial Markets - - - Government Policy and Regulation
    • G32 - Financial Economics - - Corporate Finance and Governance - - - Financing Policy; Financial Risk and Risk Management; Capital and Ownership Structure; Value of Firms; Goodwill
    • G38 - Financial Economics - - Corporate Finance and Governance - - - Government Policy and Regulation

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