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Stress testing credit risk: The Great Depression scenario

  • Varotto, Simone
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    By employing Moody’s corporate default and rating transition data spanning the last 90years we explore how much capital banks should hold against their corporate loan portfolios to withstand historical stress scenarios. Specifically, we will focus on the worst case scenario over the observation period, the Great Depression. We find that migration risk and the length of the investment horizon are critical factors when determining bank capital needs in a crisis. We show that capital may need to rise more than three times when the horizon is increased from 1year, as required by current and future regulation, to 3years. Increases are still important but of a lower magnitude when migration risk is introduced in the analysis. Further, we find that the new bank capital requirements under the so-called Basel 3 agreement would enable banks to absorb Great Depression-style losses. But, such losses would dent regulatory capital considerably and far beyond the capital buffers that have been proposed to ensure that banks survive crisis periods without government support.

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    File URL: http://www.sciencedirect.com/science/article/pii/S0378426611002780
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    Article provided by Elsevier in its journal Journal of Banking & Finance.

    Volume (Year): 36 (2012)
    Issue (Month): 12 ()
    Pages: 3133-3149

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    Handle: RePEc:eee:jbfina:v:36:y:2012:i:12:p:3133-3149
    DOI: 10.1016/j.jbankfin.2011.10.001
    Contact details of provider: Web page: http://www.elsevier.com/locate/jbf

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