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Excess Comovement of Stock Returns: Evidence from Cross-Sectional Variation in Nikkei 225 Weights

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  • Robin Greenwood
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    Abstract

    Relative to their weights in a value-weighted index, a number of stocks in Japan's Nikkei 225 stock index are overweighted by a factor of 10 or more. I document a strong positive relation between overweighting and the comovement of a stock with other stocks in the Nikkei index, and a negative relationship between index overweighting and comovement with stocks outside of the index. The cross-sectional approach resolves endogeneity problems associated with event study demonstrations of excess comovement. A trading strategy that bets on the reversion of stock prices of overweighted stocks generates economic profits, confirming that the observed comovement patterns are excessive, and providing further evidence that comovement of stock returns can be a consequence of commonality in trading behavior. The Author 2007. Published by Oxford University Press on behalf of The Society for Financial Studies., Oxford University Press.

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    File URL: http://hdl.handle.net/10.1093/rfs/hhm052
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    Bibliographic Info

    Article provided by Society for Financial Studies in its journal The Review of Financial Studies.

    Volume (Year): 21 (2008)
    Issue (Month): 3 (May)
    Pages: 1153-1186

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    Handle: RePEc:oup:rfinst:v:21:y:2008:i:3:p:1153-1186

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    Cited by:
    1. Wahal, Sunil & Yavuz, M. Deniz, 2013. "Style investing, comovement and return predictability," Journal of Financial Economics, Elsevier, vol. 107(1), pages 136-154.
    2. Yen-cheng Chang & Harrison Hong & Inessa Liskovich, 2013. "Regression Discontinuity and the Price Effects of Stock Market Indexing," NBER Working Papers 19290, National Bureau of Economic Research, Inc.
    3. Gao, Xiaohui & Ritter, Jay R., 2010. "The marketing of seasoned equity offerings," Journal of Financial Economics, Elsevier, vol. 97(1), pages 33-52, July.
    4. Agyei-Ampomah, Sam & Mazouz, Khelifa, 2011. "The comovement of option listed stocks," Journal of Banking & Finance, Elsevier, vol. 35(8), pages 2056-2069, August.
    5. Mondria, Jordi, 2010. "Portfolio choice, attention allocation, and price comovement," Journal of Economic Theory, Elsevier, vol. 145(5), pages 1837-1864, September.
    6. Green, T. Clifton & Hwang, Byoung-Hyoun, 2009. "Price-based return comovement," Journal of Financial Economics, Elsevier, vol. 93(1), pages 37-50, July.
    7. Gagnon, Louis & Karolyi, G. Andrew, 2004. "Multi-market Trading and Arbitrage," Working Paper Series 2004-9, Ohio State University, Charles A. Dice Center for Research in Financial Economics.
    8. Grullon, Gustavo & Underwood, Shane & Weston, James P., 2014. "Comovement and investment banking networks," Journal of Financial Economics, Elsevier, vol. 113(1), pages 73-89.

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