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An Examination of the Time Variation in Systematic Risk on the Stock Exchange of Mauritius

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  • Sunil Bundoo

    (University of Mauritius)

Abstract

This study estimates the systematic for the listed companies on the Stock Exchange of Mauritius using the capital asset pricing model and the market model. We then correct for thin trading. Finally, the Schwert and Seguin (1990) model is used to estimate the time variation in beta. The results indicate that the betas corrected for thin trading are quite different from the traditional beta estimates. It is therefore crucial to take thin trading into account when estimating systematic risk for markets characterized by thin trading. Moreover, when the time-variation in beta is taken into account, the empirical regularity that the spread between the systematic risk of small and large firms is higher as market volatility increases is confirmed by the data.

Suggested Citation

  • Sunil Bundoo, 2006. "An Examination of the Time Variation in Systematic Risk on the Stock Exchange of Mauritius," The African Finance Journal, Africagrowth Institute, vol. 8(2), pages 52-66.
    • Handle: RePEc:afj:journl:v:8:y:2006:i:2:p:52-66
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    Keywords

    Stock Exchange of Mauritius; Time-varying Beta;

    JEL classification:

    • G11 - Financial Economics - - General Financial Markets - - - Portfolio Choice; Investment Decisions
    • G12 - Financial Economics - - General Financial Markets - - - Asset Pricing; Trading Volume; Bond Interest Rates

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