The intellectual breakthrough contributed by the new growth theory was the recognition that investments in knowledge … and human capital endogenously generate economic growth through the spillover of knowledge. Endogenous growth theory does … not explain how or why spillovers occur. The missing link is the mechanism converting knowledge into economically relevant …

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 …