Agglomeration and Innovation
---- Acknowledgments ----
This paper is a draft chapter for the Handbook of Regional and Urban Economics, Vol. 5A and 5b. We thank Gilles Duranton, Vernon Henderson, and Will Strange for their editorial guidance and Ufuk Akcigit and seminar participants for their comments. The views expressed herein are those of the authors and do not necessarily reflect the views of the National Bureau of Economic Research, Federal Reserve Bank of Philadelphia, the Federal Reserve System, or Harvard University.