58 Pages Posted: 2 Oct 2012 Last revised: 13 Sep 2015
Date Written: October 12, 2014
Many investors purchase stock but are reluctant or unable to sell short. Combining this arbitrage asymmetry with the arbitrage risk represented by idiosyncratic volatility (IVOL) explains the negative relation between IVOL and average return. The IVOL-return relation is negative among overpriced stocks but positive among underpriced stocks, with mispricing determined by combining 11 return anomalies. Consistent with arbitrage asymmetry, the negative relation among overpriced stocks is stronger, especially for stocks less easily shorted, so the overall IVOL-return relation is negative. Further supporting our explanation, high investor sentiment weakens the positive relation among underpriced stocks and, especially, strengthens the negative relation among overpriced stocks.
Keywords: arbitrage risk, idiosyncratic volatility puzzle, short-sale constraints, investor sentiment
Suggested Citation: Suggested Citation
Stambaugh, Robert F. and Yu, Jianfeng and Yuan, Yu, Arbitrage Asymmetry and the Idiosyncratic Volatility Puzzle (October 12, 2014). Journal of Finance, Vol 70, pp 1903-1948, 2015. Available at SSRN: https://ssrn.com/abstract=2155491 or http://dx.doi.org/10.2139/ssrn.2155491
By Andrew Ang