The Wealth of Nations by Part 4 Chapter 9 Page 8

husbandry, and in the annual maintenance of the farmer’s servants and cattle, and of his family too, so far as any part of them can be considered as servants employed in cultivation.

That part of the produce of the land which remains to him after paying the rent ought to be sufficient, first, to replace to him within a reasonable time, at least during the term of his occupancy, the whole of his original expenses, together with the ordinary profits of stock; and, secondly, to replace to him annually the whole of his annual expenses, together likewise with the ordering profits of stock. Those two sorts of expenses are two capitals which the farmer employs in cultivation; and unless they are regularly restored to him, together with a reasonable profit, he cannot carry on his employment upon a level with other