Abstract
Mean reversion in stock markets has been an open question for the decades it has been meticulously tested. This study first aims at shedding further light on this unsettled issue by assessing mean reversion in a broad Turkish stock data via a non-parametric and model-free methodology. Variance ratio computations and distribution-free statistical tests based on randomization are used on dollar and lira denominated nominal, real and excess returns of Borsa Istanbul equity market. As a strong mean reversion is apparent in the empirical tests, the study secondly tries to identify a possible cause of this apparent anomaly. CAPM-based equity risk premium estimations generated via two-pass cross-sectional regressions reveal that the mean reversion might be explained by the dynamic nature of equity risk-premium. The results indicate that the mean reversion in Turkish equity market is a result of time-varying behavior of rational investors rather than market inefficiency.
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