Entry and Patenting in the Software Industry
NBER Working Paper No. 12563
---- Acknowledgements ----
Support for this research and access to data were provided by LECG Inc., via an unrestricted grant from Microsoft Corporation. We thank the editors and referees for helpful comments, as well as Anne Layne-Farrar, Alfonso Gambardella, Daniel Garcia-Swartz, Shane Greenstein, Josh Lerner, Robert Merges,Marc Rysman, Mark Schankerman, Ken Simons, Manuel Trajtenberg, and Sam Thompson along with numerous seminar and conference participants.