Score contribution per author:
α: calibrated so average coauthorship-adjusted count equals average raw count
In this paper, we estimate the impact of dynamic externalities, using direct measures of total factor productivity (TFP) growth at the regional level. We find that, at the one-digit level, significant dynamic externalities exist for the finance, services, and wholesale and retail trade industries, but-contrary to the findings of most previous research-these externalities do not exist for the manufacturing industry. © 2002 by the President and Fellows of Harvard College and the Massachusetts Institute of Technology