Innovation and technological progress are the key determinants of long-run economic growth and welfare. Therefore, an important question is, how can public policy encourage more innovation? In this chapter, I review some of the empirical findings from various recent studies on innovation and...

Technological progress builds upon itself, with the expansion of invention in one domain propelling future work in 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...