An interesting new research paper examines the role of peer influences on entrepreneurship. Since most entrepreneurs are employed in corporations before they go out on their own, the study examines how peers at those corporations effect perceptions of entrepreneurship and the likelihood of starting a business. It turns out that entrepreneurial attitudes build through feedback loops. The more entrepreneurs that come out of a place, the more likely the other employees are to become socialized to the idea, and to be more keen to market opportunities. This could explain why some businesses spin off many other startups, while others don't.