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Fat Tails, Skewed Losses, and Potential Risk Mitigation: Evidence from the Residential Mortgage Market

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  • Lingxiao Li
  • Norman G. Miller

Abstract

Evidence from the recent financial crisis brings into question the stability of risk management correlation assumptions and the effect this has on possible extreme outcomes. In this paper, we present evidence of unstable correlations between mortgage asset returns in recent years inhibiting any practical mean variance approach to portfolio diversification and risk management. Our findings suggest that returns on residential mortgage investments exhibit unusual levels of skewness and asymmetric dependence (higher correlations in downside markets). Incorporating higher-order return distribution moments in portfolio selection and diversification decisions is important to all investors concerned with fat tail risks. Optimizing portfolios from the standpoint of loss mitigation seems easy to achieve with careful geographic diversification, but deep recession loss correlations defy the longer term trends. For this reason, higher capital reserves or new hedging instruments are required to truly mitigate downside risk.

Suggested Citation

  • Lingxiao Li & Norman G. Miller, 2016. "Fat Tails, Skewed Losses, and Potential Risk Mitigation: Evidence from the Residential Mortgage Market," Journal of Real Estate Portfolio Management, Taylor & Francis Journals, vol. 22(1), pages 91-101, January.
    • Handle: RePEc:taf:repmxx:v:22:y:2016:i:1:p:91-101
    DOI: 10.1080/10835547.2016.12089982
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