I report new evidence for localized knowledge spillovers identified by within-patent variations in the geographic matching rates of citations added by inventors and citations added by examiners. Evaluated at the mean citation lag, inventor citations are 20 percent more likely than examiner citations to match the country of origin of their citing patent, while US inventor citations are 25 percent more likely to match the state or metropolitan area of their citing patent. The localization of intranational knowledge spillovers declines with the passage of time, but international borders present a persistent barrier to spillovers.
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Paper provided by Florida International University, Department of Economics in its series Working Papers with number
0405.
Length: 17 pages Date of creation: Mar 2004 Date of revision:
Jun 2005 Publication status: Forthcoming in The Review of Economics and Statistics Handle: RePEc:fiu:wpaper:0405
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