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Multivariate GARCH analysis of Fannie Mae, Freddie Mac, and American International Group: Did the short-selling ban reduce systemic return-risk?

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  • Ulibarri, Carlos A.

Abstract

This paper uses a multivariate GARCH framework to examine how the 2008 moratorium on short-selling affected the systemic return-risk across three firms at the center of the subprime mortgage crises: Fannie Mae and Freddie Mac, the two largest buyers of US home mortgages; and American International Group, a major insurer of mortgage-backed securities. Wald coefficient tests indicate shocks in prior day returns manifest less systemic return-risk under the short-selling ban, thus coinciding with the regulatory intentions of the United States Securities and Exchange Commission (SEC), to “moderate the sudden and excessive fluctuations in securities prices.” The findings also agree with prior work in observing abnormal-negative returns for heavily shorted firms, and diminished negative skewness and kurtosis under binding short-selling constraints.

Suggested Citation

  • Ulibarri, Carlos A., 2013. "Multivariate GARCH analysis of Fannie Mae, Freddie Mac, and American International Group: Did the short-selling ban reduce systemic return-risk?," The North American Journal of Economics and Finance, Elsevier, vol. 25(C), pages 60-69.
    • Handle: RePEc:eee:ecofin:v:25:y:2013:i:c:p:60-69
    DOI: 10.1016/j.najef.2013.01.003
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    More about this item

    Keywords

    Multivariate GARCH; Systemic return-risk; Short-selling constraints; Volatility persistence;
    All these keywords.

    JEL classification:

    • G15 - Financial Economics - - General Financial Markets - - - International Financial Markets

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