Spatial Growth and Industry Age
---- Acknowledgements -----
We thank Kunal Dasgupta for his excellent research assistance and Tom Holmes, Robert Lucas, Jordan Rappaport, Paul Romer, Giorgio Topa, and several seminar participants for useful comments. Desmet acknowledges the financial support of the Fundación Ramón Areces. The views expressed herein are those of the author(s) and do not necessarily reflect the views of the National Bureau of Economic Research.