Abstract

This paper has been superseded by WP 15-03. We study the location of more than 1,000 research and development (RD Tests using local K-functions reveal several concentrations of RD We develop a new procedure for identifying clusters – the multiscale core-cluster approach, to identify labs that appear to be clustered at a variety of spatial scales. Locations in these clusters are often related to basic infrastructure such as access to major roads. There is significant variation in the industrial composition of labs across these clusters. ; The clusters we identify appear related to knowledge spillovers: Citations to patents previously obtained by inventors residing in clustered areas are significantly more localized than one would predict from a (control) sample of otherwise similar patents. ; This paper supersedes Working Papers 10-33 and 11-42.

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