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Portfolio Diversification Effects of Downside Risk

  • Namwon Hyung
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    Risk managers use portfolios to diversify away the unpriced risk of individual securities. In this article we compare the benefits of portfolio diversification for downside risk in case returns are normally distributed with the case of fat-tailed distributed returns. The downside risk of a security is decomposed into a part which is attributable to the market risk, an idiosyncratic part, and a second independent factor. We show that the fat-tailed-based downside risk, measured as value-at-risk (VaR), should decline more rapidly than the normal-based VaR. This result is confirmed empirically. Copyright 2005, Oxford University Press.

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    File URL: http://hdl.handle.net/10.1093/jjfinec/nbi004
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    Article provided by Society for Financial Econometrics in its journal Journal of Financial Econometrics.

    Volume (Year): 3 (2005)
    Issue (Month): 1 ()
    Pages: 107-125

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    Handle: RePEc:oup:jfinec:v:3:y:2005:i:1:p:107-125
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