The Kauffman Foundation just posted a nice sketchbook talk by CEO Carl Schramm (embedded below), summarizing the good and vital research the company has supported that looks at the role of entrepreneurs in society.  These numbers should guide both policy and personal decisions.  

The only complaint I have is that they under-emphasized the challenge for emerging graduates—that of finding careers in an economy where new jobs will increasingly be created by new ventures, yet their training lacks practical skills in innovation and entrepreneurship.