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The fate of regions and of nations increasingly depends upon ideas and innovations to facilitate growth. In recent years, geographers have made fundamental contributions to our understanding of the innovation process by exploring the diffusion of innovation, the location of R&D, and the geography of high‐technology industry. This paper examines the geographic sources of innovation, focusing specifically on the relationship between product innovation and the underlying “technological infrastructure” of particular places. This infrastructure is comprised of agglomerations of firms in related manufacturing industries, geographic concentrations of industrial R&D, concentrations of university R&D, and business‐service firms. Once in place, these geographic concentrations of infrastructure enhance the capacity for innovation, as regions come to specialize in particular technologies and industrial sectors. Geography …