Creative Destruction in Industries
NBER Working Paper No. 12520
---- Acknowledgements ----
We thank M. Gort, S. Greenstein, C. Helfat, O. Licandro, S. Klepper, and S. Kortum for comments, R. Agarwal for comments and for data, and the NSF for support. The views expressed herein are those of the author(s) and d not necessarily reflect the views of the National Bureau of Economic Research.