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Mobility and Social Networks: Localised Knowledge Spillovers Revisited

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Author Info
Stefano Breschi () (CESPRI, Dept. of Economics, Università “L.Bocconi”)
Francesco Lissoni () (CESPRI, CESPRI, Dept. of Mechanical Engineering, Università di Brescia)

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Abstract

The paper provides a reassessment of arguments and tests in support of the existence and magnitude of localized knowledge spillovers proposed by Jaffe, Trajtenberg and Henderson (1993). We use information in patents to control for the mobility of inventors across companies and space, as well as for the network ties that such mobility helps establishing. Our results indicate that localisation effects tend to vanish where citing and cited patents are not linked to each other by any network relationship. On the contrary, knowledge flows, as evidenced by patent citations, are strongly localized to the extent that labour mobility and network ties also are. We interpret these results as evidence that geography is not a sufficient condition for accessing a local pool of knowledge, but it requires active participation in a network of knowledge exchanges. Moreover, hiring workers from competitors and other firms seems to be a key means to access such a network.

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Publisher Info
Paper provided by CESPRI, Centre for Research on Innovation and Internationalisation, Universita' Bocconi, Milano, Italy in its series CESPRI Working Papers with number 142.

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Length: 29 pages
Date of creation: Mar 2003
Date of revision: Mar 2003
Handle: RePEc:cri:cespri:wp142

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Related research
Keywords: knowledge spillovers; localization; patent citations.;

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Find related papers by JEL classification:
O31 - Economic Development, Technological Change, and Growth - - Technological Change - - - Innovation and Invention: Processes and Incentives
J60 - Labor and Demographic Economics - - Mobility, Unemployment, and Vacancies - - - General

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References listed on IDEAS
Please report citation or reference errors to , or , if you are the registered author of the cited work, log in to your RePEc Author Service profile, click on "citations" and make appropriate adjustments.:
  1. Jaffe, Adam B, 1988. "Demand and Supply Influences in R&D Intensity and Productivity Growth," The Review of Economics and Statistics, MIT Press, vol. 70(3), pages 431-37, August. [Downloadable!] (restricted)
  2. Zvi Griliches, 1992. "The Search for R&D Spillovers," NBER Working Papers 3768, National Bureau of Economic Research, Inc. [Downloadable!] (restricted)
    Other versions:
  3. Adam B. Jaffe & Manuel Trajtenberg & Rebecca Henderson, 1992. "Geographic Localization of Knowledge Spillovers as Evidenced by Patent Citations," NBER Working Papers 3993, National Bureau of Economic Research, Inc. [Downloadable!] (restricted)
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  4. Paul Krugman, 1992. "Geography and Trade," MIT Press Books, The MIT Press, edition 1, volume 1, number 0262610868, January.
  5. Jaffe, Adam B, 1989. "Real Effects of Academic Research," American Economic Review, American Economic Association, vol. 79(5), pages 957-70, December. [Downloadable!] (restricted)
  6. Acs, Zoltan J & Audretsch, David B & Feldman, Maryann P, 1992. "Real Effects of Academic Research: Comment," American Economic Review, American Economic Association, vol. 82(1), pages 363-67, March. [Downloadable!] (restricted)
  7. Adam B. Jaffe, 1986. "Technological Opportunity and Spillovers of R&D: Evidence from Firms' Patents, Profits and Market Value," NBER Working Papers 1815, National Bureau of Economic Research, Inc. [Downloadable!] (restricted)
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