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Event Studies and the Analysis of Antitrust

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  • Michael Cichello
  • Douglas Lamdin

Abstract

A standard tool in economics and finance is the event study in which one examines the impact of an event on stock returns. While hundreds of such studies have been published, the concern here is with a small subset: the use of event studies to examine antitrust issues. After a brief review of the event study technique, we provide a review of the literature that is the nexus of event studies and antitrust. The goal is to not only chronicle the development of this literature and highlight the major findings, but also to comment on important issues concerning implementation of this research method and the interpretation of the results.

Suggested Citation

  • Michael Cichello & Douglas Lamdin, 2006. "Event Studies and the Analysis of Antitrust," International Journal of the Economics of Business, Taylor & Francis Journals, vol. 13(2), pages 229-245.
  • Handle: RePEc:taf:ijecbs:v:13:y:2006:i:2:p:229-245
    DOI: 10.1080/13571510600784557
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    References listed on IDEAS

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    1. McAfee, R. Preston & Williams, Michael A., 1988. "Can event studies detect anticompetitive mergers?," Economics Letters, Elsevier, vol. 28(2), pages 199-203.
    2. Bizjak, John M & Coles, Jeffrey L, 1995. "The Effect of Private Antitrust Litigation on the Stock-Market Valuation of the Firm," American Economic Review, American Economic Association, vol. 85(3), pages 436-461, June.
    3. Larcker, David F. & Gordon, Lawrence A. & Pinches, George E., 1980. "Testing for Market Efficiency: A Comparison of the Cumulative Average Residual Methodology and Intervention Analysis," Journal of Financial and Quantitative Analysis, Cambridge University Press, vol. 15(02), pages 267-287, June.
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    5. Boardman, Anthony & Vertinsky, Ilan & Whistler, Diana, 1997. "Using information diffusion models to estimate the impacts of regulatory events on publicly traded firms," Journal of Public Economics, Elsevier, vol. 63(2), pages 283-300, January.
    6. Daniel Hosken & John David Simpson, 2001. "Have Supermarket Mergers Raised Prices? An Event Study Analysis," International Journal of the Economics of Business, Taylor & Francis Journals, vol. 8(3), pages 329-342.
    7. Eckbo, B Espen & Wier, Peggy, 1985. "Antimerger Policy under the Hart-Scott-Rodino Act: A Reexamination of the Market Power Hypothesis," Journal of Law and Economics, University of Chicago Press, vol. 28(1), pages 119-149, April.
    8. Bosch, Jean-Claude & Eckard, E Woodrow, Jr, 1991. "The Profitability of Price Fixing: Evidence from Stock Market Reaction to Federal Indictments," The Review of Economics and Statistics, MIT Press, vol. 73(2), pages 309-317, May.
    9. McWilliams, Abagail & Turk, Thomas A & Zardkoohi, Asghar, 1993. "Antitrust Policy and Mergers: The Wealth Effect of Supreme Court Decisions," Economic Inquiry, Western Economic Association International, vol. 31(4), pages 517-533, October.
    10. Eckbo, B Espen & Maksimovic, Vojislav & Williams, Joseph, 1990. "Consistent Estimation of Cross-Sectional Models in Event Studies," Review of Financial Studies, Society for Financial Studies, vol. 3(3), pages 343-365.
    11. Scott E. Hein, 2004. "Improving Tests of Abnormal Returns by Bootstrapping the Multivariate Regression Model with Event Parameters," Journal of Financial Econometrics, Society for Financial Econometrics, vol. 2(3), pages 451-471.
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    13. Lamdin, Douglas J., 2001. "Implementing and interpreting event studies of regulatory changes," Journal of Economics and Business, Elsevier, vol. 53(2-3), pages 171-183.
    14. Arthur De Vany & Henry McMillan, 2004. "Was the Antitrust Action that Broke Up the Movie Studios Good for the Movies? Evidence from the Stock Market," American Law and Economics Review, Oxford University Press, vol. 6(1), pages 135-153.
    15. Robert W. Crandall & Clifford Winston, 2005. "Does antitrust policy improve consumer welfare? Assessing the evidence," Chapters,in: Governments, Competition and Utility Regulation, chapter 2 Edward Elgar Publishing.
    16. Shahrur, Husayn, 2005. "Industry structure and horizontal takeovers: Analysis of wealth effects on rivals, suppliers, and corporate customers," Journal of Financial Economics, Elsevier, vol. 76(1), pages 61-98, April.
    17. Brady, Una & M. Feinberg, Robert, 2000. "An examination of stock-price effects of EU merger control policy," International Journal of Industrial Organization, Elsevier, vol. 18(6), pages 885-900, August.
    18. Bittlingmayer, George & Hazlett, Thomas W., 2000. "DOS Kapital: Has antitrust action against Microsoft created value in the computer industry?," Journal of Financial Economics, Elsevier, vol. 55(3), pages 329-359, March.
    19. Ajeyo Banerjee & E. Woodrow Eckard, 1998. "Are Mega-Mergers Anticompetitive? Evidence from the First Great Merger Wave," RAND Journal of Economics, The RAND Corporation, vol. 29(4), pages 803-827, Winter.
    20. John Thompson & David Kaserman, 2001. "After The Fall: Stock Price Movements and the Deterrent Effect of Antitrust Enforcement," Review of Industrial Organization, Springer;The Industrial Organization Society, vol. 19(3), pages 329-334, November.
    21. Garbade, Kenneth D & Silber, William L & White, Lawrence J, 1982. "Market Reaction to the Filing of Antitrust Suits: An Aggregate and Cross-Sectional Analysis," The Review of Economics and Statistics, MIT Press, vol. 64(4), pages 686-691, November.
    22. Eckbo, B Espen, 1992. " Mergers and the Value of Antitrust Deterrence," Journal of Finance, American Finance Association, vol. 47(3), pages 1005-1029, July.
    23. Aktas, Nihat & de Bodt, Eric & Roll, Richard, 2004. "Market Response to European Regulation of Business Combinations," Journal of Financial and Quantitative Analysis, Cambridge University Press, vol. 39(04), pages 731-757, December.
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    Citations

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    Cited by:

    1. Henryk Gurgul & Milena Suliga & Tomasz Wojtowicz, 2012. "Responses of the Warsaw Stock Exchange to the U.S. macroeconomic data announcements," Managerial Economics, AGH University of Science and Technology, Faculty of Management, vol. 12, pages 41-59.
    2. Haji Ali Beigi, Maryam & Budzinski, Oliver, 2012. "On the use of event studies to evaluate economic policy decisions: A note of caution," Ilmenau Economics Discussion Papers 80, Ilmenau University of Technology, Institute of Economics.
    3. Darren Filson, Saman Olfati, Fatos Radoniqi, . "Evaluating Mergers in the Presence of Dynamic Competition Using Impacts on Rivals," Journal of Law and Economics, University of Chicago Press, vol. 58(4).
    4. Panagiotis Fotis & Michael Polemis & Nikolaos Zevgolis, 2011. "Robust Event Studies for Derogation from Suspension of Concentrations in Greece during the Period 1995–2008," Journal of Industry, Competition and Trade, Springer, vol. 11(1), pages 67-89, March.
    5. Steve Janner & Daniel Schmidt, 2015. "Are economically significant bond returns explained by corporate news? An examination of the German corporate bond market," Financial Markets and Portfolio Management, Springer;Swiss Society for Financial Market Research, vol. 29(3), pages 271-298, August.
    6. John Kwoka, Chengyan Gu, . "Predicting Merger Outcomes: The Accuracy of Stock Market Event Studies, Market Structure Characteristics, and Agency Decisions," Journal of Law and Economics, University of Chicago Press, vol. 58(3).
    7. Ralph M. Sonenshine, 2009. "Effect of Research and Development and Market Concentration on Merger Outcomes -- An Event Study of U.S. Horizontal Mergers," Working Papers 2009-16 JEL classificatio, American University, Department of Economics.

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    Keywords

    Antitrust; Empirical Methods; Event Studies;

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