The Changing Effect of HMO Market Structure: An Analysis of Penetration, Concentration, and Ownership Between 1994-2005

Yu-Chu Shen, Vivian Wu, Glenn Melnick

NBER Working Paper No. 13775
Issued in February 2008

---- Acknowledgements -----

We gratefully acknowledge funding for this research from grant #56110 under the Robert Wood Johnson Foundation's Changes in Health Care Financing and Organization (HCFO) Initiative. We thank Robert Reddick for providing the hospital competition measures; Laurence Baker for providing historical HMO penetration data; and Shou-tzu Lin for excellent programming assistance. The views expressed herein are those of the author(s) and do not necessarily reflect the views of the National Bureau of Economic Research.

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