NATIONAL BUREAU OF ECONOMIC RESEARCH
NATIONAL BUREAU OF ECONOMIC RESEARCH
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Yongqiang Chu

92101 University City Blvd
Charlotte, NC 28223

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Institutional Affiliation: University of North Carolina at Charlotte

NBER Working Papers and Publications

December 2017The Causal Effect of Limits to Arbitrage on Asset Pricing Anomalies
with David Hirshleifer, Liang Ma: w24144
We examine the causal effect of limits to arbitrage on 11 well-known asset pricing anomalies using the pilot program of Regulation SHO, which relaxed short-sale constraints for a quasi-random set of pilot stocks, as a natural experiment. We find that the anomalies became weaker on portfolios constructed with pilot stocks during the pilot period. The pilot program reduced the combined anomaly long-short portfolio returns by 72 basis points per month, a difference that survives risk adjustment with standard factor models. The effect comes only from the short legs of the anomaly portfolios.
 
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