TY  - BOOK
AU  - Jaffe,Adam B.
AU  - Trajtenberg,Manuel
AU  - Henderson,Rebecca
ED  - National Bureau of Economic Research.
TI  - Geographic Localization of Knowledge Spillovers as Evidenced by Patent  Citations
T2  - NBER working paper series
PY  - 1992///
CY  - Cambridge, Mass.
PB  - National Bureau of Economic Research
N1  - February 1992; Hardcopy version available to institutional subscribers
N2  - 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
UR  - https://www.nber.org/papers/w3993
UR  - http://dx.doi.org/10.3386/w3993
ER  -