eprintid: 3056
rev_number: 14
eprint_status: archive
userid: 69
dir: disk0/00/00/30/56
datestamp: 2016-02-12 11:11:36
lastmod: 2018-03-08 09:33:53
status_changed: 2016-02-12 11:11:36
type: monograph
metadata_visibility: show
creators_name: Zacchia, Paolo
creators_id: paolo.zacchia@imtlucca.it
title: Knowledge Spillovers through Networks of Scientists
ispublished: submitted
subjects: HB
subjects: HD
subjects: T201
divisions: EIC
full_text_status: public
monograph_type: working_paper
keywords: JEL Codes: C31, D85, O31, O33. 
Keywords: R&D Spillovers, Coauthorship Networks, Indirect Friends
abstract: In this paper I directly test the hypothesis that interactions between inventors of different
firms drive knowledge spillovers. I construct a network of publicly traded companies
in which each link is a function of the relative proportion of two firms’ inventors who
have former patent collaborators in both organizations. I use this measure to weigh the
impact of R&D performed by each firm on the productivity and innovation outcomes
of its network linkages. An empirical concern is that the resulting estimates may reflect
unobserved, simultaneous determinants of firm performance, network connections and
external R&D. I address this problem with an innovative IV strategy, motivated by a
game-theoretic model of firm interaction. I instrument the R&D of one firm’s connections
with that of other firms that are sufficiently distant in network space. With the
resulting spillover estimates, I calculate that among firms connected to the network
the marginal social return of R&D amounts to approximately 112% of the marginal
private return
date: 2017
pages: 65
institution: IMT Institute for Advanced Studies Lucca
related_url_url: https://sites.google.com/site/paolozacchia/downloads/Network_Spillovers_Text.pdf?attredirects=0
related_url_type: author
citation:   Zacchia, Paolo  Knowledge Spillovers through Networks of Scientists.  Working Paper       (Submitted)   
document_url: http://eprints.imtlucca.it/3056/1/Network_Spillovers_Text%2BAppendices.pdf