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

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  • Robin Greenwood

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.

Suggested Citation

  • Robin Greenwood, 2008. "Excess Comovement of Stock Returns: Evidence from Cross-Sectional Variation in Nikkei 225 Weights," Review of Financial Studies, Society for Financial Studies, vol. 21(3), pages 1153-1186, May.
  • Handle: RePEc:oup:rfinst:v:21:y:2008:i:3:p:1153-1186
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    File URL: http://hdl.handle.net/10.1093/rfs/hhm052
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    Citations

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    Cited by:

    1. Grullon, Gustavo & Underwood, Shane & Weston, James P., 2014. "Comovement and investment banking networks," Journal of Financial Economics, Elsevier, vol. 113(1), pages 73-89.
    2. Anna Obizhaeva, 2009. "Portfolio Transitions and Stock Price Dynamics," Working Papers w0224, Center for Economic and Financial Research (CEFIR).
    3. Wahal, Sunil & Yavuz, M. Deniz, 2013. "Style investing, comovement and return predictability," Journal of Financial Economics, Elsevier, vol. 107(1), pages 136-154.
    4. Gagnon, Louis & Andrew Karolyi, G., 2010. "Multi-market trading and arbitrage," Journal of Financial Economics, Elsevier, vol. 97(1), pages 53-80, July.
    5. Honghui Chen & Vijay Singal & Robert F. Whitelaw, 2015. "Comovement Revisited," NBER Working Papers 21281, National Bureau of Economic Research, Inc.
    6. Baruník, Jozef & Kočenda, Evžen & Vácha, Lukáš, 2016. "Gold, oil, and stocks: Dynamic correlations," International Review of Economics & Finance, Elsevier, vol. 42(C), pages 186-201.
    7. repec:bis:bisqtr:1803j is not listed on IDEAS
    8. Kotaro Miwa & Kazuhiro Ueda, 2016. "Price distortion induced by a flawed stock market index," Financial Markets and Portfolio Management, Springer;Swiss Society for Financial Market Research, vol. 30(2), pages 137-160, May.
    9. Chen, Honghui & Singal, Vijay & Whitelaw, Robert F., 2016. "Comovement revisited," Journal of Financial Economics, Elsevier, vol. 121(3), pages 624-644.
    10. Volkan Muslu & Michael Rebello & Yexiao Xu, 2014. "Sell-Side Analyst Research and Stock Comovement," Journal of Accounting Research, Wiley Blackwell, vol. 52(4), pages 911-954, September.
    11. Agyei-Ampomah, Sam & Mazouz, Khelifa, 2011. "The comovement of option listed stocks," Journal of Banking & Finance, Elsevier, vol. 35(8), pages 2056-2069, August.
    12. Yen-Cheng Chang & Harrison Hong & Inessa Liskovich, 2015. "Regression Discontinuity and the Price Effects of Stock Market Indexing," Review of Financial Studies, Society for Financial Studies, vol. 28(1), pages 212-246.
    13. Pan, Deng & Shi, Jing & Wu, Fei & Zhang, Bohui, 2015. "Investor heterogeneity and commonality in stock return and liquidity," Economic Systems, Elsevier, vol. 39(3), pages 458-473.
    14. Hacıbedel, Burcu, 2014. "Does investor recognition matter for asset pricing?," Emerging Markets Review, Elsevier, vol. 21(C), pages 1-20.
    15. Mondria, Jordi, 2010. "Portfolio choice, attention allocation, and price comovement," Journal of Economic Theory, Elsevier, vol. 145(5), pages 1837-1864, September.
    16. Green, T. Clifton & Hwang, Byoung-Hyoun, 2009. "Price-based return comovement," Journal of Financial Economics, Elsevier, vol. 93(1), pages 37-50, July.
    17. Jame, Russell & Tong, Qing, 2014. "Industry-based style investing," Journal of Financial Markets, Elsevier, vol. 19(C), pages 110-130.
    18. Gao, Xiaohui & Ritter, Jay R., 2010. "The marketing of seasoned equity offerings," Journal of Financial Economics, Elsevier, vol. 97(1), pages 33-52, July.
    19. Kaul, Aditya & Mehrotra, Vikas & Stefanescu, Carmen, 2016. "Location and excess comovement," Journal of Empirical Finance, Elsevier, vol. 37(C), pages 293-308.

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