NATIONAL BUREAU OF ECONOMIC RESEARCH
NATIONAL BUREAU OF ECONOMIC RESEARCH
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Of Time and Space: Technological Spillovers among Patents and Unpatented Innovations during Early U.S. Industrialization

B. Zorina Khan

NBER Working Paper No. 20732
Issued in December 2014

---- Acknowledgments ----

I benefited from valuable comments offered by Lee Branstetter, Claude Diebolt, Stanley Engerman, Lee Epstein, Claudia Goldin, Kirti Gupta, Stephen Haber, Rick Hornbeck, Naomi Lamoreaux, John Majewski, Petra Moser, Adam Mossoff, Alessandro Nuvolari, Alan Olmstead, Giovanni Peri, Tom Nicholas, Ted Sichelman, Daniel Spulber, Robert Whaples, Brian Wright, Gavin Wright, and participants at the All-UC Conference, the economic history workshop at Harvard University, the University of California at Santa Barbara, LeadershIP Conference, Bureau d'Economie Théorique et Appliquée, Carnegie Mellon University, Thomas Edison Fellowship Meeting, San Diego Law School, and the 2013 American Economic Association meeting. Matthew Hillard, Ben Stein and Hugo Tran provided excellent research assistance. I am also grateful to Esther Khan for research consulting, and to Jennifer Snow who demonstrated the intricacies of ArcGis programming. This project was supported by funding from the National Science Foundation. Liability for errors is limited to the author. The views expressed herein are those of the author and do not necessarily reflect the views of the National Bureau of Economic Research.

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