Patent Citations and the Geography of Knowledge Spillovers: A Reassessment

@article{Thompson2005PatentCA,
  title={Patent Citations and the Geography of Knowledge Spillovers: A Reassessment},
  author={Peter Thompson and Melanie Fox-Kean},
  journal={The American Economic Review},
  year={2005},
  volume={95},
  pages={450-460}
}
Adam B. Jaffe, Manuel Trajtenberg, and Rebecca Henderson (1993) developed a matching method to study the geography of knowledge spillovers using patent citations, and found that knowledge spillovers are strongly localized. Their method matches each citing patent to a non-citing patent intended to control for the pre-existing geographic concentration of production. We show how the method of selecting the control group may induce spurious evidence of localized spillovers. This paper reassesses… Expand

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