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This paper examines the trends in geographic localization of knowledge spillovers via patent citations, considering US patents from the period of 1976-2015. Despite accelerating globalization and widespread perception of the "death of distance," our multi-cohort "matched-sample" study reveals signicant and growing localization effects of knowledge spillovers at both intra- and international levels after the 1980s. We also develop a novel network index based on the notion of "farness," which an instrumental variable estimation shows to be a significant and sizable determinant of the observed trends at the state-sector level.
Authors

Research Fellow Columbia University
Sokbae is an IFS Research Fellow and a Professor at Columbia University, with an interest in Econometrics, Applied Microeconomics and Statistics.

Jihong Lee

Hyuk-Soo Kwon

Ryungha Oh
Working Paper details
- DOI
- 10.1920/wp.cem.2017.5517
- Publisher
- The IFS
Suggested citation
Kwon, H et al. (2017). Knowledge spillovers and patent citations: trends in geographic localization, 1976-2015. London: The IFS. Available at: https://ifs.org.uk/publications/knowledge-spillovers-and-patent-citations-trends-geographic-localization-1976-2015 (accessed: 8 February 2025).
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