NATIONAL BUREAU OF ECONOMIC RESEARCH
NATIONAL BUREAU OF ECONOMIC RESEARCH

Strategic Entry Deterrence and the Behavior of Pharmaceutical Incumbents Prior to Patent Expiration

Glenn Ellison, Sara Fisher Ellison

NBER Working Paper No. 13069
Issued in April 2007

---- Acknowledgements -----

This work was supported by the National Science Foundation (grants SES-9818534, SES-0219205, and SES-0550897), the Sloan Foundation, and the Hoover Institute. We thank Emek Basker, Tom Chang, David Hwang, and Alan Sorensen for excellent research assistance, Gillian Currie for help in constructing the data set, Katie MacFarlane for guidance on institutional details, and Ditas Riad and Rhea Mihalison for their assistance on data issues. We also thank Fiona Scott Morton for her part in our joint data collection efforts and for providing other data to us. Finally, we thank Marcus Asplund, Ernie Berndt, Steve Berry, Richard Blundell, Judy Chevalier, Paul Joskow, Nancy Rose, Otto Toivanen, and seminar participants at various schools for helpful comments. 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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