IDEAS home Printed from https://ideas.repec.org/a/ucp/jlawec/v52y2009i3p523-550.html
   My bibliography  Save this article

Estimation and Identification of Merger Effects: An Application to Hospital Mergers

Author

Listed:
  • Leemore Dafny

Abstract

Existing empirical estimates of merger effects are compromised by the fact that merging and nonmerging entities differ in unobserved ways that independently affect outcomes of interest. To obtain an unbiased estimate of the effect of consummated mergers, I propose an approach that focuses on the response of rivals to mergers and accounts for the endogeneity of exposure to these mergers. I apply this approach to evaluate the impact of independent hospital mergers in the United States between 1989 and 1996. Using the physical colocation of rivals as an instrument for whether they merge, I find a sizeable, one-time increase in price following a rival's merger, with the greatest increase occurring among hospitals nearest the merging hospitals. These results are more consistent with predictions from structural models of the hospital industry than with prior observational estimates of the effects of hospital mergers. (c) 2009 by The University of Chicago. All rights reserved.

Suggested Citation

  • Leemore Dafny, 2009. "Estimation and Identification of Merger Effects: An Application to Hospital Mergers," Journal of Law and Economics, University of Chicago Press, vol. 52(3), pages 523-550, August.
  • Handle: RePEc:ucp:jlawec:v:52:y:2009:i:3:p:523-550
    as

    Download full text from publisher

    File URL: http://dx.doi.org/10.1086/600079
    File Function: link to full text
    Download Restriction: Access to full text is restricted to subscribers.

    As the access to this document is restricted, you may want to search for a different version of it.

    References listed on IDEAS

    as
    1. Capps, Cory & Dranove, David & Satterthwaite, Mark, 2003. " Competition and Market Power in Option Demand Markets," RAND Journal of Economics, The RAND Corporation, vol. 34(4), pages 737-763, Winter.
    2. Keeler, Emmett B. & Melnick, Glenn & Zwanziger, Jack, 1999. "The changing effects of competition on non-profit and for-profit hospital pricing behavior," Journal of Health Economics, Elsevier, vol. 18(1), pages 69-86, January.
    3. Dranove, David & White, William D, 1994. "Recent Theory and Evidence on Competition in Hospital Markets," Journal of Economics & Management Strategy, Wiley Blackwell, vol. 3(1), pages 169-209, Spring.
    4. Ho, Vivian & Hamilton, Barton H., 2000. "Hospital mergers and acquisitions: does market consolidation harm patients?," Journal of Health Economics, Elsevier, vol. 19(5), pages 767-791, September.
    5. Eckbo, B. Espen, 1983. "Horizontal mergers, collusion, and stockholder wealth," Journal of Financial Economics, Elsevier, vol. 11(1-4), pages 241-273, April.
    6. Dranove, David & Lindrooth, Richard, 2003. "Hospital consolidation and costs: another look at the evidence," Journal of Health Economics, Elsevier, vol. 22(6), pages 983-997, November.
    7. Woolley, J. Michael, 1989. "The competitive effects of horizontal mergers in the hospital industry," Journal of Health Economics, Elsevier, vol. 8(3), pages 271-291, December.
    8. Vita, Michael G. & Schumann, Laurence, 1991. "The competitive effects of horizontal mergers in the hospital industry: A closer look," Journal of Health Economics, Elsevier, vol. 10(3), pages 359-372, October.
    9. Tay, Abigail, 2003. " Assessing Competition in Hospital Care Markets: The Importance of Accounting for Quality Differentiation," RAND Journal of Economics, The RAND Corporation, vol. 34(4), pages 786-814, Winter.
    10. Esther Gal-Or, 1999. "Mergers and Exclusionary Practices in Health Care Markets," Journal of Economics & Management Strategy, Wiley Blackwell, vol. 8(3), pages 315-350, September.
    11. Leemore S. Dafny, 2005. "How Do Hospitals Respond to Price Changes?," American Economic Review, American Economic Association, vol. 95(5), pages 1525-1547, December.
    12. Hausman, Jerry A., 1983. "Specification and estimation of simultaneous equation models," Handbook of Econometrics,in: Z. Griliches† & M. D. Intriligator (ed.), Handbook of Econometrics, edition 1, volume 1, chapter 7, pages 391-448 Elsevier.
    Full references (including those not matched with items on IDEAS)

    More about this item

    Statistics

    Access and download statistics

    Corrections

    All material on this site has been provided by the respective publishers and authors. You can help correct errors and omissions. When requesting a correction, please mention this item's handle: RePEc:ucp:jlawec:v:52:y:2009:i:3:p:523-550. See general information about how to correct material in RePEc.

    For technical questions regarding this item, or to correct its authors, title, abstract, bibliographic or download information, contact: (Journals Division). General contact details of provider: http://www.journals.uchicago.edu/JLE/ .

    If you have authored this item and are not yet registered with RePEc, we encourage you to do it here. This allows to link your profile to this item. It also allows you to accept potential citations to this item that we are uncertain about.

    If CitEc recognized a reference but did not link an item in RePEc to it, you can help with this form .

    If you know of missing items citing this one, you can help us creating those links by adding the relevant references in the same way as above, for each refering item. If you are a registered author of this item, you may also want to check the "citations" tab in your RePEc Author Service profile, as there may be some citations waiting for confirmation.

    Please note that corrections may take a couple of weeks to filter through the various RePEc services.

    IDEAS is a RePEc service hosted by the Research Division of the Federal Reserve Bank of St. Louis . RePEc uses bibliographic data supplied by the respective publishers.