Please use this identifier to cite or link to this item: https://hdl.handle.net/10419/23232 
Year of Publication: 
2002
Series/Report no.: 
Wellesley College Working Paper No. 2002-01
Publisher: 
Wellesley College, Department of Economics, Wellesley, MA
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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