GEOGRAPHIC LOCALIZATION OF KNOWLEDGE SPILLOVERS AS EVIDENCED BY PATENT CITATIONS
成果类型：
Article
署名作者：
JAFFE, AB; TRAJTENBERG, M; HENDERSON, R
署名单位：
Massachusetts Institute of Technology (MIT); Tel Aviv University
刊物名称：
QUARTERLY JOURNAL OF ECONOMICS
ISSN/ISSBN：
0033-5533
DOI：
10.2307/2118401
发表日期：
1993
页码：
577-598
关键词：
摘要：
We compare the geographic location of patent citations with that of the cited patents, as evidence of the extent to which knowledge spillovers are geographically localized. We find that citations to domestic patents are more likely to be domestic, and more likely to come from the same state and SMSA as the cited patents, compared with a ''control frequency'' reflecting the pre-existing concentration of related research activity. These effects are particularly significant at the local (SMSA) level. Localization fades over time, but only very slowly. There is no evidence that more ''basic'' inventions diffuse more rapidly than others.
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