Localized Knowledge Spillovers: Evidence from the Spatial Clustering of R&D Labs and Patent Citations

34 Pages Posted: 4 Oct 2017

See all articles by Kristy Buzard

Kristy Buzard

Syracuse University - Department of Economics

Gerald A. Carlino

Federal Reserve Bank of Philadelphia

Robert M. Hunt

Consumer Finance Institute, Federal Reserve Bank of Philadelphia

Jake Carr

Center for Urban and Regional Analysis

Tony E. Smith

University of Pennsylvania - Department of Systems Engineering

Date Written: 2017-10-03

Abstract

Patent citations are a commonly used indicator of knowledge spillovers among inventors, while clusters of research and development labs are locations in which knowledge spillovers are particularly likely to occur. In this paper, we assign patents and citations to newly defined clusters of American R&D labs to capture the geographic extent of knowledge spillovers. Our tests show that the localization of knowledge spillovers, as measured via patent citations, is strongest at small spatial scales and diminishes rapidly with distance. On average, patents within a cluster are about three to six times more likely to cite an inventor in the same cluster than one in a control group. At the same time, the strength of knowledge spillovers varies widely between clusters. The results are robust to the specification of patent technological categories, the method of citation matching and alternate cluster definitions.

Keywords: spatial clustering, geographic concentration, R&D labs, localized knowledge spillovers, patent citations

JEL Classification: O31, R12

Suggested Citation

Buzard, Kristy and Carlino, Gerald A. and Hunt, Robert M. and Carr, Jake and Smith, Tony E., Localized Knowledge Spillovers: Evidence from the Spatial Clustering of R&D Labs and Patent Citations (2017-10-03). FRB of Philadelphia Working Paper No. 17-32. Available at SSRN: https://ssrn.com/abstract=3047775

Kristy Buzard (Contact Author)

Syracuse University - Department of Economics ( email )

Syracuse, NY 13244-1020
United States

HOME PAGE: http://faculty.maxwell.syr.edu/kbuzard

Gerald A. Carlino

Federal Reserve Bank of Philadelphia ( email )

Ten Independence Mall
Philadelphia, PA 19106-1574
United States
215-574-6434 (Phone)
215-574-4364 (Fax)

Robert M. Hunt

Consumer Finance Institute, Federal Reserve Bank of Philadelphia ( email )

Ten Independence Mall
Philadelphia, PA 19106-1574
United States
215-574-3806 (Phone)
215-574-7101 (Fax)

Jake Carr

Center for Urban and Regional Analysis ( email )

0126 Derby Hall
154 North Oval Mall
Columbus, OH 43210
United States

Tony E. Smith

University of Pennsylvania - Department of Systems Engineering ( email )

School of Engineering & Applied Science
3718 Locust Walk
Philadelphia, PA 19104
United States
215-898-9647 (Phone)
215-898-5020 (Fax)

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