The Vital Few: The Entrepreneur and American Economic Progress by Jonathan Hughes (Professor of Economics, Professor of Economics, Northwestern University)
Originally published in 1965 and called "a landmark in American intellectual history" by W.F. Rickenbacker in The National Review, The Vital Few has been expanded to include biographies of Mary Switzer and Marriner Eccles and a short essay on the nature of bureaucracy in both the government and the private sector.