Abstract
Recent studies report that the size effect in the cross-section of stock returns has disappeared after the early 1980s. This paper shows that the disappearance of the size effect from realized returns can be attributed to unexpected shocks to the profitability of small and big firms. We find that small firms experience large negative profitability shocks after the early 1980s, while big firms experience large positive shocks. As a result, realized returns of small and big firms over this period differ substantially from expected returns. After adjusting for the price impact of profitability shocks, we find that there still is a robust size effect in the cross-section of expected returns. Our results highlight the importance of in-sample cash flow shocks for understanding cross-sectional return predictability.
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