The Myth of the Robber Barons describes the role of key entrepreneurs in the economic growth of the United States from 1850 to 1910. The entrepreneurs studied are Cornelius Vanderbilt, John D. Rockefeller, James J. Hill, Andrew Mellon, Charles Schwab, and the Scranton family. Most historians argue that these men, and others like them, were Robber Barons. The story, however, is more complicated. The author, Burton Folsom, divides the entrepreneurs into two groups market entrepreneurs and political entrepreneurs. The market entrepreneurs, such as Hill, Vanderbilt, and Rockefeller, succeeded by producing a quality product at a competitive price. The political entrepreneurs such as Edward Collins in steamships and in railroads the leaders of the Union Pacific Railroad were men who used the power of government to succeed.