Successful innovation depends on complementary competencies in networks of
producers, users, and governmental bodies. The effects of complementarities
within innovation networks are modeled using Kauffman's NK-model. From the
model, the hypothesis is derived that producers, users, and governments se
lf-organize in specialized innovation networks: producers of particular tec
hnologies increasingly focus on particular user markets in particular count
ries. Data on 863 aircraft models (1909-1997) show these strong specializat
ion patterns in the post-war period. Policy implications are indicated emph
asizing the recent rise in transnational collaborations, which can be under
stood as a means of escaping historical specialization patterns. (C) 2000 E
lsevier Science B.V. All rights reserved.