@techreport{Johnson2002Small,
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.},
author = {Daniel K.N. Johnson and Milena Mareva},
copyright = {http://www.econstor.eu/dspace/Nutzungsbedingungen},
keywords = {N9; O3; R1; L6; 330; Biotechnische Industrie; Innovation; Patent; Spillover-Effekt; Wissenstransfer; Regionale Konzentration; Sch\"{a}tzung; USA},
language = {eng},
number = {2002,01},
title = {It?s a Small(er) World: The Role of Geography and Networks in Biotechnology Innovation},
type = {Working Papers / Wellesley College, Department of Economics},
url = {http://hdl.handle.net/10419/23232},
year = {2002}
}
