NATIONAL BUREAU OF ECONOMIC RESEARCH
NATIONAL BUREAU OF ECONOMIC RESEARCH

Brand Loyalty, Generic Entry and Price Competition in Pharmaceuticals in the Quarter Century After the 1984 Waxman-Hatch Legislation

Ernst R. Berndt, Murray L. Aitken

NBER Working Paper No. 16431
Issued in October 2010

---- Acknowledgements -----

Paper presented at the Pharmaceutical Economics Conference honoring Professor Henry Grabowski, Durham, North Carolina, Sept. 17, 2010. Research support from the Pharmaceutical Research and Manufacturers of America is gratefully acknowledged, as is the considerable data and technical support from Michael S. Kleinrock and Kevin J. Weiss at IMS Health. The statements, findings, conclusions and opinions contained and expressed herein are based in part on data obtained under license from the following IMS Health Inc. information services: PlanTrak (2006-2009); IMS Health National Prescription Audit; IMS Health NPA Plus 7, Method of Payment; and IMS National Sales Perspectives. Any statements, findings and conclusions are those of the authors, and are not necessarily those of the institutions with whom the authors are affiliated, the research sponsor, or the National Bureau of Economic Research.

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