Small and young businesses are essential for job creation, innovation, and economic growth. Even most of the superstar …

linked fields. Our analysis uses 1.8 million U.S. patents and their citation properties to map the innovation network and its … strength. Past innovation network structures are calculated using citation patterns across technology classes during 1975 … predictive power on future innovation after 1995. This pattern is consistent with the idea that when there is more past upstream …

. Importantly, the theoretical model captures the strategic behavior between competing firms, its effect on their innovation … knowledge diffusion from the frontier firms to the laggard ones in explaining the observed shifts. We conclude by presenting new … evidence that corroborates a declining knowledge diffusion in the economy. We document a higher concentration of patenting in …