Estimation and Identification of Merger Effects: An Application to Hospital Mergers
AbstractAdvances in structural demand estimation have substantially improved economists' ability to forecast the impact of mergers. However, these models rely on extensive assumptions about consumer choice and firm objectives, and ultimately observational methods are needed to test their validity. Observational studies, in turn, suffer from selection problems arising from the fact that merging entities differ from non-merging entities in unobserved ways. To obtain an accurate estimate of the effect of consummated mergers, I propose a combination of rival analysis and instrumental variables. By focusing on the effect of a merger on the behavior of rival firms, and instrumenting for these mergers, unbiased estimates of the effect of a merger on market outcomes can be obtained. Using this methodology, I evaluate the impact of independent hospital mergers between 1989 and 1996 on rivals' prices. I find sharp increases in rivals' prices following a merger, with the greatest effect on the closest rivals. The results for this industry are more consistent with predictions from structural models than with prior observational estimates.
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Bibliographic InfoPaper provided by National Bureau of Economic Research, Inc in its series NBER Working Papers with number 11673.
Date of creation: Oct 2005
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Publication status: published as Estimation and Identification of Merger Effects: An Application to Hospital Mergers(pp. 523-550) Leemore Dafny DOI: 10.1086/600079 Stable URL: http://www.jstor.org/stable/10.1086/600079
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Find related papers by JEL classification:
- I1 - Health, Education, and Welfare - - Health
- D4 - Microeconomics - - Market Structure and Pricing
- L0 - Industrial Organization - - General
This paper has been announced in the following NEP Reports:
- NEP-ALL-2005-10-08 (All new papers)
- NEP-COM-2005-10-08 (Industrial Competition)
- NEP-HEA-2005-10-08 (Health Economics)
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- 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.
- Martin Gaynor & William B. Vogt, 1999.
"Antitrust and Competition in Health Care Markets,"
NBER Working Papers
7112, National Bureau of Economic Research, Inc.
- Martin Gaynor & William B. Vogt, 2003.
"Competition Among Hospitals,"
NBER Working Papers
9471, National Bureau of Economic Research, Inc.
- Martin Gaynor & William Vogt, 2002. "Competition Among Hospitals," GSIA Working Papers 2003-E20, Carnegie Mellon University, Tepper School of Business.
- Martin Gaynor & William B Vogt, 2003. "Competition among Hospitals," The Centre for Market and Public Organisation 03/087, Department of Economics, University of Bristol, UK.
- 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.
- Robert Connor & Roger Feldman & Bryan Dowd, 1998. "The Effects of Market Concentration and Horizontal Mergers on Hospital Costs and Prices," International Journal of the Economics of Business, Taylor & Francis Journals, vol. 5(2), pages 159-180.
- Krishnan, Ranjani, 2001. "Market restructuring and pricing in the hospital industry," Journal of Health Economics, Elsevier, vol. 20(2), pages 213-237, March.
- 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 737-63, Winter.
- Leemore S. Dafny, 2005. "How Do Hospitals Respond to Price Changes?," American Economic Review, American Economic Association, vol. 95(5), pages 1525-1547, December.
- 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.
- 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.
- Dranove, David & Lindrooth, Richard & White, William D. & Zwanziger, Jack, 2008. "Is the impact of managed care on hospital prices decreasing?," Journal of Health Economics, Elsevier, vol. 27(2), pages 362-376, March.
- Robert Town & Douglas Wholey & Roger Feldman & Lawton R. Burns, 2006. "The Welfare Consequences of Hospital Mergers," NBER Working Papers 12244, National Bureau of Economic Research, Inc.
- Melnick, Glenn & Keeler, Emmett, 2007. "The effects of multi-hospital systems on hospital prices," Journal of Health Economics, Elsevier, vol. 26(2), pages 400-413, March.
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