The Wealth of Nations_ Books 4-5 - Adam Smith [169]
The ground expenses, as they are called, or what the landlord lays out upon the improvement of his land, are in this system, too, honoured with the appellation of productive expenses. Till the whole of those expenses, together with the ordinary profits of stock, have been completely repaid to him by the advanced rent which he gets from his land, that advanced rent ought to be regarded as sacred and inviolable, both by the church and by the king; ought to be subject neither to tithe nor to taxation. If it is otherwise, by discouraging the improvement of land the church discourages the future increase of her own tithes, and the king the future increase of his own taxes. As in a well-ordered state of things, therefore, those ground expenses, over and above reproducing in the completest manner their own value, occasion likewise after a certain time a reproduction of a net produce, they are in this system considered as productive expenses.
The ground expenses of the landlord, however, together with the original and the annual expenses of the farmer, are the only three sorts of expenses which in this system are considered as productive. All other expenses and all other orders of people, even those who in the common apprehensions of men are regarded as the most productive, are in this account of things represented as altogether barren and unproductive.
Artificers and manufacturers in particular, whose industry, in the common apprehensions of men, increases so much the value of the rude produce of land, are in this system represented as a class of people altogether barren and unproductive. Their labour, it is said, replaces only the stock which employs them, together with its ordinary profits. That stock consists in the materials, tools, and wages advanced to them by their employer; and is the fund destined for their employment and maintenance. Its profits are the fund destined for the maintenance of their employer. Their employer, as he advances to them the stock of materials, tools, and wages necessary for their employment, so he advances to himself what is necessary for his own maintenance, and this maintenance he generally proportions to the profit which he expects to make by the price of their work. Unless its price repays to him the maintenance which he advances