We examine the 'home bias' of international knowledge spillovers as measured by the speed of patent citations (i.e. knowledge spreads slowly over international boundaries). We present the first compelling econometric evidence that the geographical localization of knowledge spillovers has fallen over time, as we would expect from the dramatic fall in communication and travel costs. Our proposed estimator controls for correlated fixed effects and censoring in duration models and we apply it to data on over two million citations between 1975 and 1999. Home bias declines substantially when we control for fixed effects: there is practically no home bias for the more 'modern' sectors such as pharmaceuticals and information/communication technologies.
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Paper provided by C.E.P.R. Discussion Papers in its series CEPR Discussion Papers with number
6435.
Find related papers by JEL classification: F23 - International Economics - - International Factor Movements and International Business - - - Multinational Firms; International Business O32 - Economic Development, Technological Change, and Growth - - Technological Change - - - Management of Technological Innovation and R&D O33 - Economic Development, Technological Change, and Growth - - Technological Change - - - Technological Change: Choices and Consequences; Diffusion Processes
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