U.S. county data for the last 20 or 30 years show that manufacturing employment has been deconcentrating. In contrast, the service sector exhibits concentration in counties with intermediate levels of employment. This paper presents a theory where local sectoral growth is driven by technological diffusion across space. The age of an industry -- measured as the time elapsed since the last major general purpose technology innovation in the sector -- determines the pattern of scale dependence in growth rates. Young industries exhibit non-monotone relationships between employment levels and growth rates, while old industries experience negative scale dependence in growth rates. The model then predicts that the relationship between county employment growth rates and county employment levels in manufacturing at the turn of the 20th century should be similar to the same relationship in services in the last 20 years. We provide evidence consistent with this prediction.
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Paper provided by National Bureau of Economic Research, Inc in its series NBER Working Papers with number
13302.
Length: Date of creation: Aug 2007 Date of revision: Handle: RePEc:nbr:nberwo:13302
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Piyabha Kongsamut & Sergio Rebelo & Danyang Xie, 1997.
"Beyond Balanced Growth,"
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Esteban Rossi-Hansberg & Mark L. J. Wright, 2006.
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Boyan Jovanovic & Peter L. Rousseau, 2005.
"General Purpose Technologies,"
NBER Working Papers
11093, National Bureau of Economic Research, Inc.
[Downloadable!] (restricted)
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