On the Predictability of Stock Returns in Real Time
Researchers have documented an abundance of evidence that stock returns are predictable ex post facto. In this study, we address the ex ante predictability of the cross section of stock returns by investigating whether a real-time investor could have used book-to-market equity, firm size, and one-year lagged returns to generate portfolio profits during the 197497 period. We develop variations on common recursive out-of-sample methods and demonstrate a marked difference between ex post and ex ante predictability, suggesting that the current notion of predictability in the literature is exaggerated.
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