The whole expense of maintaining the fixed capital must evidently be excluded from the neat revenue of the society. Neither the materials necessary for supporting their useful machines and instruments of trade, their profitable buildings, etc. nor the produce of the labour necessary for fashioning those materials into the proper form, can ever make any part of it. The price of that labour may indeed make a part of it; as the workmen so employed may place the whole value of their wages in their stock reserved for immediate consumption. But in other sorts of labour, both the price and the produce go to this stock; the price to that of the workmen, the produce to that of other people, whose subsistence, conveniencies, and amusements, are augmented by the labour of those workmen. The intention of the fixed capital is to increase the productive powers of labour, or to enable the same number of labourers to perform a much greater quantity of work. In a farm where all the necessary buildings, fences, drains, communications, etc. are in the most perfect good order, the same number of labourers and labouring cattle will raise a much greater produce, than in one of equal extent and equally good ground, but not furnished with equal conveniencies. In manufactures, the same number of hands, assisted with the best machinery, will work up a much greater quantity of goods than with more imperfect instruments of trade. The expense which is properly laid out upon a fixed capital of any kind, is always repaid with great profit, and increases the annual produce by a much greater value than that of the support which such improvements require. This support, however, still requires a certain portion of that produce. A certain quantity of materials, and the labour of a certain number of workmen, both of which might have been immediately employed to augment the food, clothing, and lodging, the subsistence and conveniencies of the society, are thus diverted to another employment, highly advantageous indeed, but still different from this one. It is upon this account that all such improvements in mechanics, as enable the same number of workmen to perform an equal quantity of work with cheaper and simpler machinery than had been usual before, are always regarded as advantageous to every society. A certain quantity of materials, and the labour of a certain number of workmen, which had before been employed in supporting a more complex and expensive machinery, can afterwards be applied to augment the quantity of work which that or any other machinery is useful only for performing. The undertaker of some great manufactory, who employs a thousand a-year in the maintenance of his machinery, if he can reduce this