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Strategic Selection of Risk Models and Bank Capital Regulation

Author

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  • Colliard, Jean-Edouard
Abstract
The regulatory use of banks' internal models makes capital requirements more risk-sensitive but invites regulatory arbitrage. I develop a framework to study bank regulation with strategic selection of risk models. A bank supervisor can discourage arbitrage by auditing risk models, and implements capital ratios less risk-sensitive than in the first-best to reduce auditing costs. The optimal capital ratios of a national supervisor can be different from those set by supranational authorities, in which case the supervisor optimally tolerates biased models. I discuss the empirical implications of this "hidden model" problem, and policy answers such as leverage ratios and more reliance on backtesting mechanisms.

Suggested Citation

  • Colliard, Jean-Edouard, 2017. "Strategic Selection of Risk Models and Bank Capital Regulation," HEC Research Papers Series 1229, HEC Paris, revised 29 Nov 2017.
    • Handle: RePEc:ebg:heccah:1229
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    2. Schlam, Carina & Woyand, Corinna, 2023. "The rollout of internal credit risk models: Implications for the novel partial-use philosophy," Discussion Papers 07/2023, Deutsche Bundesbank.
    3. Marco Migueis, 2017. "Forward-looking and Incentive-compatible Operational Risk Capital Framework," Finance and Economics Discussion Series 2017-087, Board of Governors of the Federal Reserve System (U.S.).
    4. Böhnke, Victoria & Ongena, Steven & Paraschiv, Florentina & Reite, Endre J., 2023. "Back to the roots of internal credit risk models: Does risk explain why banks' risk-weighted asset levels converge over time?," Journal of Banking & Finance, Elsevier, vol. 156(C).
    5. Grochola, Nicolaus & Schlütter, Sebastian, 2023. "Discretionary decisions in capital requirements under Solvency II," ICIR Working Paper Series 50/23, Goethe University Frankfurt, International Center for Insurance Regulation (ICIR).
    6. Dal Borgo, Mariela, 2022. "Internal models for deposits: Effects on banks' capital and interest rate risk of assets," Journal of Banking & Finance, Elsevier, vol. 135(C).
    7. Evren Ors, 2020. "Discussion of Becker, Bos, and Roszbach," Journal of Money, Credit and Banking, Blackwell Publishing, vol. 52(S1), pages 143-147, October.
    8. Niepmann, Friederike & Stebunovs, Viktors, 2024. "Modeling your stress away," Journal of Banking & Finance, Elsevier, vol. 158(C).
    9. Behn, Markus & Couaillier, Cyril, 2023. "Same same but different: credit risk provisioning under IFRS 9," Working Paper Series 2841, European Central Bank.
    10. Ding, Haina & Guembel, Alexander & Ozanne, Alessio, 2020. "Market Information in Banking Supervision: The Role of Stress Test Design," TSE Working Papers 20-1144, Toulouse School of Economics (TSE).
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    More about this item

    Keywords

    basel risk-weights; internal risk models; leverage ratio; supervisory audits;
    All these keywords.

    JEL classification:

    • D82 - Microeconomics - - Information, Knowledge, and Uncertainty - - - Asymmetric and Private Information; Mechanism Design
    • D84 - Microeconomics - - Information, Knowledge, and Uncertainty - - - Expectations; Speculations
    • G21 - Financial Economics - - Financial Institutions and Services - - - Banks; Other Depository Institutions; Micro Finance Institutions; Mortgages
    • 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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