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Do Investors Care if Steve Jobs is Healthy?


  • James Koch


  • Robert Fenili


  • Richard Cebula



Steve Jobs of Apple, Inc., is one of the best known CEOs in the world, and some stock analysts have termed him “irreplaceable.” Using conventional event study methods, we test the magnitude of these announcements on Apple’s share price and its market capitalization. We focus upon nine “events” between 2004 and 2009 in which new information about Mr. Jobs’ health was flushed into the marketplace, on occasion by Apple itself, but more often by the commentary and speculations of media observers, stock analysts and bloggers. We find that the impact of these announcements upon Apple share prices is mixed, usually modest, and disappears over time. We conclude that Jobs’ health has an impact on Apple’s share price and market capitalization, but that impact is not always negative and not nearly as large as many observers apparently believe. Copyright International Atlantic Economic Society 2011

Suggested Citation

  • James Koch & Robert Fenili & Richard Cebula, 2011. "Do Investors Care if Steve Jobs is Healthy?," Atlantic Economic Journal, Springer;International Atlantic Economic Society, vol. 39(1), pages 59-70, March.
  • Handle: RePEc:kap:atlecj:v:39:y:2011:i:1:p:59-70
    DOI: 10.1007/s11293-010-9261-z

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    References listed on IDEAS

    1. Salinger, Michael, 1992. "Standard Errors in Event Studies," Journal of Financial and Quantitative Analysis, Cambridge University Press, vol. 27(01), pages 39-53, March.
    2. Armitage, Seth, 1995. " Event Study Methods and Evidence on Their Performance," Journal of Economic Surveys, Wiley Blackwell, vol. 9(1), pages 25-52, March.
    3. Fama, Eugene F, et al, 1969. "The Adjustment of Stock Prices to New Information," International Economic Review, Department of Economics, University of Pennsylvania and Osaka University Institute of Social and Economic Research Association, vol. 10(1), pages 1-21, February.
    4. repec:bla:joares:v:6:y:1968:i:2:p:159-178 is not listed on IDEAS
    5. A. Craig MacKinlay, 1997. "Event Studies in Economics and Finance," Journal of Economic Literature, American Economic Association, vol. 35(1), pages 13-39, March.
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    Cited by:

    1. Rossi, Fabrizio & Cebula, Richard, 2013. "Stock Market Reactions to Announcements of Board of Director Appointments: Evidence from Italy," MPRA Paper 58403, University Library of Munich, Germany.

    More about this item


    Event study; Equity markets; Apple; Steve Jobs; JEL; G11; G12; G14;

    JEL classification:

    • G11 - Financial Economics - - General Financial Markets - - - Portfolio Choice; Investment Decisions
    • G12 - Financial Economics - - General Financial Markets - - - Asset Pricing; Trading Volume; Bond Interest Rates
    • G14 - Financial Economics - - General Financial Markets - - - Information and Market Efficiency; Event Studies; Insider Trading


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