Please use this identifier to cite or link to this item: http://hdl.handle.net/10419/23232
Authors: 
Johnson, Daniel K.N.
Mareva, Milena
Year of Publication: 
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.
JEL: 
N9
O3
R1
L6
Document Type: 
Working Paper

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