تحقیقات جهانی بازار بورس

Excess volatility and efficiency in French and German stock markets

In this paper, we analyse whether the French and German stock markets can be classified to be efficient or whether they exhibit excess volatility. We assess efficiency in each market by employing the VAR methodology of Campbell and Shiller (Campbell, J.Y., Shiller, R.J., 1988b. The dividend–price ratio and expectations of future dividends and discount factors. Rev. Financ. Stud. 1, 195–228) and adopting two alternative assumptions regarding equilibrium expected returns. The first model assumes that equilibrium expected excess returns are constant, while the second model assumes that equilibrium returns depend upon a time varying risk premium which varies with the conditional expectation of the return variance (i.e. the CAPM). We find that the model which assumes constant excess returns is clearly rejected for both France and Germany. However, the volatility (CAPM) model provides some evidence for efficiency.

    Keywords

    Excess volatility
    Efficient markets
    Equilibrium returns

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