The Wealth of Nations by Part 4 Chapter 9 Page 12

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,