Figueiredo, Octávio; Guimarães, Paulo; Woodward, Douglas - Faculdade de Economia, Universidade do Porto - 2014
This paper investigates the hypothesis that knowledge spillovers increase where industries are localized. At the same time, we take a fresh look at the role of distance in knowledge diffusion. Our unique database combines U.S. county-level patent citation data with county-level establishment and...