Encouraging Entrepreneurs: Lessons for Government Policy — HBS Working Knowledge

This one makes sense. If you encourage entrepreneurs they will encourage others. What HBS Working Knowledge's Encouraging Entrepreneurs: Lessons for Government Policy does is give the academic imprint:

"In recent research, Harvard Business School professor Ramana Nanda analyzes these deeper layers of entrepreneurship. In 'Peer Effects and Entrepreneurship,' a working paper coauthored with Jesper B. Sørensen of Stanford University's Graduate School of Business, Nanda examines the question of whether a person is more likely to pursue an entrepreneurial activity if some of his or her coworkers have experience as entrepreneurs."