Geographic Localization of Knowledge Spillovers as Evidenced by Patent Citations / Adam B. Jaffe, Manuel Trajtenberg, Rebecca Henderson.

By:

Jaffe, Adam B

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Material type: Text

TextSeries: Working Paper Series (National Bureau of Economic Research) ; no. w3993.Publication details: Cambridge, Mass. National Bureau of Economic Research 1992.Description: 1 online resource: illustrations (black and white)Subject(s):

O33 - Technological Change: Choices and Consequences • Diffusion Processes
R11 - Regional Economic Activity: Growth, Development, Environmental Issues, and Changes

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Abstract: We compare the geographic location of patent citations to those of the cited patents, as evidence of the extent to which knowledge spillovers are geographically localized. We find that citations to U.S. patents are more likely to come from the U.S., and more likely to come from the same state and SMSA as the cited patents than one would expect based only on the preexisting concentration of related research activity. These effects are particularly significant at the local (SMSA) level, and are particularly apparent in early citations.

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Item type	Home library	Collection	Call number	Status	Date due	Barcode	Item holds
Working Paper	Biblioteca Digital	Colección NBER	nber w3993 (Browse shelf(Opens below))	Not For Loan

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February 1992.

We compare the geographic location of patent citations to those of the cited patents, as evidence of the extent to which knowledge spillovers are geographically localized. We find that citations to U.S. patents are more likely to come from the U.S., and more likely to come from the same state and SMSA as the cited patents than one would expect based only on the preexisting concentration of related research activity. These effects are particularly significant at the local (SMSA) level, and are particularly apparent in early citations.