As cities increasingly become centers of economic growth and innovation, there is a need to understand their inner …

concentration, with Silicon Valley as the epitome of a tech cluster. We investigate productivity effects of knowledge worker … productivity increases by 2.8 percent with a ten percent increase in cluster size, the share of the software engineering community … productivity effects are causal. Productivity gains from cluster size growth are strongest for clusters hosting between 0.67 and 13 …

on top inventors based on the universe of US patents 1971 - 2007 to quantify the productivity advantages of Silicon … Rochester high-tech cluster. I test whether the change in cluster size affected the productivity of inventors outside Kodak and … the photography sector. I find that between 1996 and 2007 the productivity of non-Kodak inventors in Rochester declined by …