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Did the HMO Revolution Cause Hospital Consolidation?

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Author Info
Robert Town
Douglas Wholey
Roger Feldman
Lawton R. Burns
Abstract

During the 1990s US healthcare markets underwent a significant transformation. Managed care rose to become the dominant form of insurance in the private sector. Also, a wave of hospital consolidation occurred. In 1990, the mean population-weighted hospital Herfindahl-Hirschman Index (HHI) in a Health Services Area (HSA) was .19. By 2000, the HHI had risen to .26. This paper explores whether the rise in managed care caused the increase in hospital concentration. We use an instrumental variables approach with 10-year differences to identify the relationship between managed care penetration and hospital consolidation. Our results strongly imply that the rise of managed care did not cause the hospital consolidation wave. This finding is robust to a number of different specifications.

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Paper provided by National Bureau of Economic Research, Inc in its series NBER Working Papers with number 11087.

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Date of creation: Jan 2005
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Handle: RePEc:nbr:nberwo:11087

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Find related papers by JEL classification:
I11 - Health, Education, and Welfare - - Health - - - Analysis of Health Care Markets
L12 - Industrial Organization - - Market Structure, Firm Strategy, and Market Performance - - - Monopoly; Monopolization Strategies

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References listed on IDEAS
Please report citation or reference errors to , or , if you are the registered author of the cited work, log in to your RePEc Author Service profile, click on "citations" and make appropriate adjustments.:
  1. Martin Gaynor & William B. Vogt, 1999. "Antitrust and Competition in Health Care Markets," NBER Working Papers 7112, National Bureau of Economic Research, Inc. [Downloadable!] (restricted)
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  2. Newey, Whitney K., 1987. "Efficient estimation of limited dependent variable models with endogenous explanatory variables," Journal of Econometrics, Elsevier, vol. 36(3), pages 231-250, November. [Downloadable!] (restricted)
  3. Hansen, Lars Peter, 1982. "Large Sample Properties of Generalized Method of Moments Estimators," Econometrica, Econometric Society, vol. 50(4), pages 1029-54, July. [Downloadable!] (restricted)
  4. Werden, Gregory J., 1990. "The limited relevance of patient migration data in market delineation for hospital merger cases," Journal of Health Economics, Elsevier, vol. 8(4), pages 363-376, February. [Downloadable!] (restricted)
  5. Douglas Staiger & James H. Stock, 1997. "Instrumental Variables Regression with Weak Instruments," Econometrica, Econometric Society, vol. 65(3), pages 557-586, May.
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  6. Daniel P. Kessler & Mark B. McClellan, 2000. "Is Hospital Competition Socially Wasteful?," The Quarterly Journal of Economics, MIT Press, vol. 115(2), pages 577-615, May. [Downloadable!] (restricted)
  7. Laurence C. Baker & Martin L. Brown, 1999. "Managed Care, Consolidation Among Health Care Providers, and Health Care: Evidence from Mammography," RAND Journal of Economics, The RAND Corporation, vol. 30(2), pages 351-374, Summer. [Downloadable!] (restricted)
  8. Raymond Deneckere & Carl Davidson, 1985. "Incentives to Form Coalitions with Bertrand Competition," RAND Journal of Economics, The RAND Corporation, vol. 16(4), pages 473-486, Winter. [Downloadable!] (restricted)
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  1. 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. [Downloadable!] (restricted)
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