期刊
JOURNAL OF FINANCIAL AND QUANTITATIVE ANALYSIS
卷 56, 期 8, 页码 2634-2658出版社
CAMBRIDGE UNIV PRESS
DOI: 10.1017/S0022109020000885
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Cross-firm predictability among economically linked firms can last up to 10 years, with each source contributing differently over different time horizons. The predictability arises from momentum and contemporaneous correlation in returns between firms, with commonality in momentum playing a significant role in longer-term predictability.
Cross-firm predictability among economically linked firms can arise when both firms exhibit their own momentum and their returns are contemporaneously correlated. We show that cross-firm predictability can last up to 10 years, which is hard to reconcile with an interpretation of slow information diffusion. However, it is consistent with the economically linked firms' commonality in momentum. The contribution of each source can be found by decomposing leaders' returns into the predictable (momentum) and news components. Sorting on each, we find that both sources contribute almost equally to 1-month predictability, whereas commonality in momentum is solely responsible for longer-horizon cross-firm predictability.
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