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Diversification disasters

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  • Ibragimov, Rustam
  • Jaffee, Dwight
  • Walden, Johan
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    Abstract

    The recent financial crisis has revealed significant externalities and systemic risks that arise from the interconnectedness of financial intermediaries' risk portfolios. We develop a model in which the negative externality arises because intermediaries' actions to diversify that are optimal for individual intermediaries may prove to be suboptimal for society. We show that the externality depends critically on the distributional properties of the risks. The optimal social outcome involves less risk-sharing, but also a lower probability for massive collapses of intermediaries. We derive the exact conditions under which risk-sharing restrictions create a socially preferable outcome. Our analysis has implications for regulation of financial institutions and risk management.

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    Bibliographic Info

    Article provided by Elsevier in its journal Journal of Financial Economics.

    Volume (Year): 99 (2011)
    Issue (Month): 2 (February)
    Pages: 333-348

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    Handle: RePEc:eee:jfinec:v:99:y:2011:i:2:p:333-348

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    Web page: http://www.elsevier.com/locate/inca/505576

    Related research

    Keywords: Financial crisis Financial institutions Systemic risk Limits of diversification;

    References

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    Cited by:
    1. Balli, Faruk & Basher, Syed Abul & Balli, Hatice Ozer, 2013. "International Income Risk-Sharing and the Global Financial Crisis of 2008--2009," MPRA Paper 43720, University Library of Munich, Germany.
    2. Allen, Franklin & Babus, Ana & Carletti, Elena, 2012. "Asset commonality, debt maturity and systemic risk," Journal of Financial Economics, Elsevier, vol. 104(3), pages 519-534.
    3. Vallascas, Francesco & Keasey, Kevin, 2012. "Bank resilience to systemic shocks and the stability of banking systems: Small is beautiful," Journal of International Money and Finance, Elsevier, vol. 31(6), pages 1745-1776.
    4. Chollete, Lorán & de la Peña, Victor & Lu, Ching-Chih, 2012. "International diversification: An extreme value approach," Journal of Banking & Finance, Elsevier, vol. 36(3), pages 871-885.
    5. Brown, Martin & Trautmann, Stefan T. & Vlahu, Razvan, 2012. "Contagious Bank Runs: Experimental Evidence," Working Papers on Finance 1207, University of St. Gallen, School of Finance.
    6. Luca RICCETTI & Alberto RUSSO & Mauro GALLEGATI, 2011. "Leveraged Network-Based Financial Accelerator," Working Papers 371, Universita' Politecnica delle Marche (I), Dipartimento di Scienze Economiche e Sociali.
    7. Ibragimov, Rustam, 2014. "On the robustness of location estimators in models of firm growth under heavy-tailedness," Journal of Econometrics, Elsevier, vol. 181(1), pages 25-33.
    8. Tomas Fiala & Tomas Havranek, 2014. "Ailing Mothers, Healthy Daughters? Contagion in the Central European Banking Sector," Working Papers IES 2014/10, Charles University Prague, Faculty of Social Sciences, Institute of Economic Studies, revised Apr 2014.
    9. Dieter Gramlich & Mikhail V. Oet & Stephen J. Ong, 2013. "Policy in adaptive financial markets—the use of systemic risk early warning tools," Working Paper 1309, Federal Reserve Bank of Cleveland.
    10. Paolo Tasca & Stefano Battiston, . "Diversification and Financial Stability," Working Papers CCSS-11-001, ETH Zurich, Chair of Systems Design.

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