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Bank Runs, Fragility, and Regulation

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  • Manuel Amador
  • Javier Bianchi

Abstract

We examine banking regulation in a macroeconomic model of bank runs. We construct a general equilibrium model where banks may default because of fundamental or self-fulfilling runs. With only fundamental defaults, we show that the competitive equilibrium is constrained efficient. However, when banks are vulnerable to runs, banks’ leverage decisions are not ex-ante optimal: individual banks do not internalize that higher leverage makes other banks more vulnerable. The theory calls for introducing minimum capital requirements, even in the absence of bailouts.

Suggested Citation

  • Manuel Amador & Javier Bianchi, 2024. "Bank Runs, Fragility, and Regulation," Working Papers 804, Federal Reserve Bank of Minneapolis.
    • Handle: RePEc:fip:fedmwp:98383
    DOI: 10.21034/wp.804
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    References listed on IDEAS

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    1. Mark Aguiar & Manuel Amador & Hugo Hopenhayn & Iván Werning, 2019. "Take the Short Route: Equilibrium Default and Debt Maturity," Econometrica, Econometric Society, vol. 87(2), pages 423-462, March.
    2. Fernando Alvarez & Urban J. Jermann, 2000. "Efficiency, Equilibrium, and Asset Pricing with Risk of Default," Econometrica, Econometric Society, vol. 68(4), pages 775-798, July.
    3. Hans Gersbach & Jean-Charles Rochet, 2012. "Aggregate Investment Externalities and Macroprudential Regulation," Journal of Money, Credit and Banking, Blackwell Publishing, vol. 44, pages 73-109, December.
    4. Aguiar, Mark & Amador, Manuel, 2019. "A contraction for sovereign debt models," Journal of Economic Theory, Elsevier, vol. 183(C), pages 842-875.
    5. Calomiris, Charles W & Kahn, Charles M, 1991. "The Role of Demandable Debt in Structuring Optimal Banking Arrangements," American Economic Review, American Economic Association, vol. 81(3), pages 497-513, June.
    6. Timothy J. Kehoe & David K. Levine, 1993. "Debt-Constrained Asset Markets," The Review of Economic Studies, Review of Economic Studies Ltd, vol. 60(4), pages 865-888.
    7. Harold L. Cole & Timothy J. Kehoe, 2000. "Self-Fulfilling Debt Crises," The Review of Economic Studies, Review of Economic Studies Ltd, vol. 67(1), pages 91-116.
    8. Ottonello, Pablo & Perez, Diego J. & Varraso, Paolo, 2022. "Are collateral-constraint models ready for macroprudential policy design?," Journal of International Economics, Elsevier, vol. 139(C).
    9. Jiang, Erica Xuewei & Matvos, Gregor & Piskorski, Tomasz & Seru, Amit, 2024. "Monetary tightening and U.S. bank fragility in 2023: Mark-to-market losses and uninsured depositor runs?," Journal of Financial Economics, Elsevier, vol. 159(C).
    10. Hart, Oliver D., 1975. "On the optimality of equilibrium when the market structure is incomplete," Journal of Economic Theory, Elsevier, vol. 11(3), pages 418-443, December.
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    More about this item

    Keywords

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    JEL classification:

    • E32 - Macroeconomics and Monetary Economics - - Prices, Business Fluctuations, and Cycles - - - Business Fluctuations; Cycles
    • G21 - Financial Economics - - Financial Institutions and Services - - - Banks; Other Depository Institutions; Micro Finance Institutions; Mortgages
    • G01 - Financial Economics - - General - - - Financial Crises
    • G33 - Financial Economics - - Corporate Finance and Governance - - - Bankruptcy; Liquidation
    • E44 - Macroeconomics and Monetary Economics - - Money and Interest Rates - - - Financial Markets and the Macroeconomy
    • E58 - Macroeconomics and Monetary Economics - - Monetary Policy, Central Banking, and the Supply of Money and Credit - - - Central Banks and Their Policies

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