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Event Studies and the Analysis of Antitrust

  • Michael Cichello
  • Douglas Lamdin

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.

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File URL: http://www.tandfonline.com/10.1080/13571510600784557
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Article provided by Taylor & Francis Journals in its journal International Journal of the Economics of Business.

Volume (Year): 13 (2006)
Issue (Month): 2 ()
Pages: 229-245

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Handle: RePEc:taf:ijecbs:v:13:y:2006:i:2:p:229-245
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  1. 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.
  2. 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 309-17, May.
  3. 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.
  4. Robert W. Crandall & Clifford Winston, 2003. "Does Antitrust Policy Improve Consumer Welfare? Assessing the Evidence," Journal of Economic Perspectives, American Economic Association, vol. 17(4), pages 3-26, Fall.
  5. 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 343-65.
  6. Eckbo, B. Espen, 1983. "Horizontal mergers, collusion, and stockholder wealth," Journal of Financial Economics, Elsevier, vol. 11(1-4), pages 241-273, April.
  7. 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.
  8. 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 686-91, November.
  9. 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.
  10. 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.
  11. 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.
  12. 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.
  13. 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 436-61, June.
  14. 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 119-49, April.
  15. 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.
  16. 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.
  17. 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.
  18. 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.
  19. McAfee, R. Preston & Williams, Michael A., 1988. "Can event studies detect anticompetitive mergers?," Economics Letters, Elsevier, vol. 28(2), pages 199-203.
  20. Eckbo, B Espen, 1992. " Mergers and the Value of Antitrust Deterrence," Journal of Finance, American Finance Association, vol. 47(3), pages 1005-29, July.
  21. Fee, C. Edward & Thomas, Shawn, 2004. "Sources of gains in horizontal mergers: evidence from customer, supplier, and rival firms," Journal of Financial Economics, Elsevier, vol. 74(3), pages 423-460, December.
  22. John Thompson & David Kaserman, 2001. "After The Fall: Stock Price Movements and the Deterrent Effect of Antitrust Enforcement," Review of Industrial Organization, Springer, vol. 19(3), pages 329-334, November.
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