Time-Varying Mean Reversion in Stock Prices: Evidence and Implications for Market Efficiency
نویسندگان
چکیده
This paper investigates changes in the long-horizon behaviour of stock prices. Using a time-varyingparameter framework, we find that any pre-World War II tendency for mean reversion disappearsduring the post-War period. Furthermore, when we account for changes in the market risk premiumdue to dramatic shifts in pre-War return volatility, the full sample evidence for mean reversion ismuch weaker than previously reported.
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