1911 Encyclopædia Britannica, Volume 13… (1911)
“ Hufeland was the first among German economists to point out the profit of the entrepreneur as a distinct species of revenue with laws peculiar to itself. He also tends towards, though he does not explicitly state, the view that rent is a general term applicable to all payments resulting from differences of degree among productive forces of the same order. Thus the superior gain of a specially gifted workman or specially skilled employer is in time assimilated to the payment for a natural agency of more than the minimum efficiency. ”
