NATIONAL BUREAU OF ECONOMIC RESEARCH
NATIONAL BUREAU OF ECONOMIC RESEARCH

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

Leemore S. Dafny

NBER Working Paper No. 11673
Issued in October 2005

---- Acknowledgements -----

I am grateful for helpful suggestions by an anonymous referee, Julie Cullen, David Dranove, Jon Gruber, Vivian Ho, Richard Lindrooth, Michael Mazzeo, Robert Town, and especially Julian Jamison, Ilyana Kuziemko, and Scott Stern. This paper has also benefited from comments by numerous colleagues at seminars and conferences. I thank David Dranove, Richard Lindrooth, and Laurence Baker for generously sharing their data, and Jean Roth of NBER for assistance with the HCRIS database. Angela Malakhov, Fiona Wong and Subramaniam Ramanarayanan provided excellent research assistance. Support from the Institute for Policy Research at Northwestern is gratefully acknowledged. 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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