It's a small(er) world : the role of geography and networks in biotechnology innovation

by: Daniel K. Johnson ...

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.

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Year of publication:	Jan. 2002 ; [Elektronische Ressource]
Other Persons:	Johnson, Daniel K. N. (contributor) ; Mareva, Milena (contributor)
Institutions:	Wellesley College / Department of Economics (contributor)
Publisher:	Wellesley, Mass. : Wellesley College, Dept. of Economics
Subject:	Biotechnologie-Industrie \| Biotechnology industry \| Innovation \| Patent \| Spillover-Effekt \| Spillover effect \| Wissenstransfer \| Knowledge transfer \| Regionales Cluster \| Regional cluster \| Schätzung \| Estimation \| USA \| United States