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Anatomy of a Government Intervention in Index Stocks: Price Pressure or Information Effects?


  • Karan Bhanot

    (University of Texas at San Antonio)


In a massive intervention designed to deter speculators, the Hong Kong Monetary Authority (HKMA) bought Hang Seng index stocks in August 1998. These stocks experienced a 24% abnormal return during the intervention period. The abnormal returns are not reversed over the next eight weeks, refuting the hypothesis that returns are due to temporary liquidity effects. Cross-sectional analysis of daily abnormal returns during the intervention period reveals that these returns are related to overall intervention activity rather than stock-specific intervention. This evidence is consistent with information effects rather than price pressure effects.

Suggested Citation

  • Karan Bhanot, 2006. "Anatomy of a Government Intervention in Index Stocks: Price Pressure or Information Effects?," The Journal of Business, University of Chicago Press, vol. 79(2), pages 963-986, March.
  • Handle: RePEc:ucp:jnlbus:v:79:y:2006:i:2:p:963-986

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    Cited by:

    1. Jeetendra Dangol, 2008. "Unanticipated Political Events and Stock Returns: An Event Study," NRB Economic Review, Nepal Rastra Bank, Research Department, vol. 20, pages 86-110, April.
    2. Yao, Yi & Yang, Rong & Liu, Zhiyuan & Hasan, Iftekhar, 2013. "Government intervention and institutional trading strategy: Evidence from a transition country," Global Finance Journal, Elsevier, vol. 24(1), pages 44-68.
    3. Azevedo, Alcino & Karim, Mohamad & Gregoriou, Andros & Rhodes, Mark, 2014. "Stock price and volume effects associated with changes in the composition of the FTSE Bursa Malaysian KLCI," Journal of International Financial Markets, Institutions and Money, Elsevier, vol. 28(C), pages 20-35.
    4. Shirota, Toyoichiro, 2018. "Evaluating the Unconventional Monetary Policy in Stock Markets : A Semi-parametric Approach," Discussion paper series. A 322, Graduate School of Economics and Business Administration, Hokkaido University.

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