II

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 expense to five hundred, will naturally employ the other five hundred in purchasing an additional quantity of materials to be wrought up by an additional number of workmen. The quantity of that work, therefore, which his machinery was useful only for performing, will naturally be augmented, and with it all the advantage and conveniency which the society can derive from that work.