… is from pages 24-25 of the 2006 Liberty Fund edition of Ludwig von Mises’s 1956 volume, The Anti-capitalistic Mentality (available free-of-charge on-line here):
Everybody is free to join the ranks of the three progressive classes of a capitalist society. These classes are not closed castes. Membership in them is not a privilege conferred on the individual by a higher authority or inherited from one’s ancestors. These classes are not clubs, and the ins have no power to keep out any newcomer. What is needed to become a capitalist, an entrepreneur or a deviser of new technological methods is brains and will power. The heir of a wealthy man enjoys a certain advantage as he starts under more favorable conditions than others. But his task in the rivalry of the market is not easier, but sometimes even more wearisome and less remunerative than that of a newcomer. He has to reorganize his inheritance in order to adjust it to the changes in market conditions. Thus, for instance, the problems that the heir of a railroad “empire” had to face were, in the last decades, certainly more knotty than those encountered by the man who started from scratch in trucking or in air transportation.