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Title:It?s a Small(er) World: The Role of Geography and Networks in Biotechnology Innovation PDF Logo
Authors:Johnson, Daniel K.N.
Mareva, Milena
Issue Date:2002
Series/Report no.:Working Papers / Wellesley College, Department of Economics 2002,01
Abstract:Using patent citation data for the U.S., we test whether knowledge spillovers in biotechnology are sensitive to distance. Controlling for self-citation by inventor, assignee and examiner, cohort-based regression analysis shows that spillovers are local but that distance is becoming less important with time. Network analysis paints a picture of a stable network between states, but a changing environment between individual actors, with a growing importance of connectedness. The popular maxim that everyone is connected by six degrees of separation is tested with surprising results.
Document Type:Working Paper
Appears in Collections:Working Papers, Department of Economics, Wellesley College

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