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Carrying the (Paper) Burden: A Portfolio View of Systemic Risk and Optimal Bank Size

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  • JAAP W.B. BOS
  • MARTIEN LAMERS
  • VICTORIA PURICE

Abstract

We examine the relationship between bank size and financial stability by viewing the supervisor of a banking system as an ‘investor’ holding a portfolio of banks. Based on this view, we investigate the role of large banks in determining the systemic risk in this portfolio. Our results, based on book data of U.S. banks and Bank Holding Companies, indicate that the largest banks are consistently overrepresented in the current portfolio compared with the minimum variance portfolio. Moreover, the risk level of the portfolio can be reduced by limiting concentration without sacrificing returns.

Suggested Citation

  • Jaap W.B. Bos & Martien Lamers & Victoria Purice, 2014. "Carrying the (Paper) Burden: A Portfolio View of Systemic Risk and Optimal Bank Size," Working Papers of Faculty of Economics and Business Administration, Ghent University, Belgium 14/882, Ghent University, Faculty of Economics and Business Administration.
    • Handle: RePEc:rug:rugwps:14/882
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    References listed on IDEAS

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    1. Ledoit, Olivier & Wolf, Michael, 2003. "Improved estimation of the covariance matrix of stock returns with an application to portfolio selection," Journal of Empirical Finance, Elsevier, vol. 10(5), pages 603-621, December.
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    More about this item

    Keywords

    Systemic risk; Modern Portfolio Theory; U.S. banking;
    All these keywords.

    JEL classification:

    • C61 - Mathematical and Quantitative Methods - - Mathematical Methods; Programming Models; Mathematical and Simulation Modeling - - - Optimization Techniques; Programming Models; Dynamic Analysis
    • E44 - Macroeconomics and Monetary Economics - - Money and Interest Rates - - - Financial Markets and the Macroeconomy
    • E63 - Macroeconomics and Monetary Economics - - Macroeconomic Policy, Macroeconomic Aspects of Public Finance, and General Outlook - - - Comparative or Joint Analysis of Fiscal and Monetary Policy; Stabilization; Treasury Policy
    • G21 - Financial Economics - - Financial Institutions and Services - - - Banks; Other Depository Institutions; Micro Finance Institutions; Mortgages

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