routinized phase where innovation takes place within top-performing incumbents; (3) a second entrepreneurial phase characterized … routinization, in which no further innovation takes place, but is instead a phase of structural change. Using data on 74 West German …

effect of the composition of economic activity on innovation. We test whether the specialization of economic activity within … a narrow concentrated set of economic activities is more conducive to knowledge spillovers or if diversity, by bringing … together complementary activities, better promotes innovation. The evidence provides considerable support for the diversity …