Comment by jacobheller

A really good book to read on the subject is AnnaLee Saxenian's Regional Advantage: Culture and Competition in Silicon Valley and Route 128 (http://www.amazon.com/Regional-Advantage-Culture-Competition...). It discusses why Route 128 failed while Silicon Valley flourished. A major part is that under California law, non-competes are not enforceable in California. As people moved freely between competing companies, their ideas, information, and best practices traveled with them. The diffusion of good ideas gave the region as a whole a competitive edge.