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Localized knowledge spillovers and patent citations: A distance-based approach

Author

Listed:
  • Yasusada Murata

    (Advanced Research Institute for the Sciences and Humanities, Nihon University)

  • Ryo Nakajima

    (Department of Economics, Yokohama National University)

  • Ryosuke Okamoto

    (National Graduate Institute for Policy Studies)

  • Ryuichi Tamura

    (Graduate School of Humanities and Social Sciences, University of Tsukuba)

Abstract
The existence of localized knowledge spillovers found by Jaffe, Trajtenberg and Henderson (1993) has recently been challenged by Thompson and Fox-Kean (2005). To settle this debate, we develop a new approach by incorporating their concepts of control patents into the distance-based test of localization (Duranton and Overman, 2005). Using microgeographic data, we identify localization distance for each technology class while allowing for cross-boundary spillovers, unlike the existing literature where localization is detected at the state or metropolitan statistical area level. We find solid evidence supporting localized knowledge spillovers even when finer controls are used. We further relax the commonly made assumption of perfect controls, and show that the majority of technology classes exhibit localization unless hidden biases induced by imperfect controls are extremely large.

Suggested Citation

  • Yasusada Murata & Ryo Nakajima & Ryosuke Okamoto & Ryuichi Tamura, 2011. "Localized knowledge spillovers and patent citations: A distance-based approach," GRIPS Discussion Papers 11-11, National Graduate Institute for Policy Studies.
    • Handle: RePEc:ngi:dpaper:11-11
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    References listed on IDEAS

    as
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    More about this item

    JEL classification:

    • O31 - Economic Development, Innovation, Technological Change, and Growth - - Innovation; Research and Development; Technological Change; Intellectual Property Rights - - - Innovation and Invention: Processes and Incentives
    • R12 - Urban, Rural, Regional, Real Estate, and Transportation Economics - - General Regional Economics - - - Size and Spatial Distributions of Regional Economic Activity; Interregional Trade (economic geography)

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