The Role of Shorting, Firm Size, and Time on Market Anomalies
AQR Capital Management, LLC
Tobias J. Moskowitz
University of Chicago - Booth School of Business; AQR Capital; National Bureau of Economic Research (NBER)
May 1, 2012
Chicago Booth Research Paper No. 12-22
Fama-Miller Working Paper
We examine the role of shorting, firm size, and time on the profitability of size, value, and momentum strategies. We find that long positions comprise almost all of size, 60% of value, and half of momentum profits. Shorting becomes less important for momentum and more important for value as firm size decreases. The value premium decreases with firm size and is weak among the largest stocks. Momentum profits, however, exhibit no reliable relation with size. These effects are robust over 86 years of U.S. equity data and almost 40 years of data across four international equity markets and five asset classes. Variation over time and across markets of these effects is consistent with random chance. We find little evidence that size, value, and momentum returns are significantly affected by changes in trading costs or institutional and hedge fund ownership over time.
Number of Pages in PDF File: 49
Date posted: June 23, 2012
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