Suppose with a given capital, the labour of a certain number of men produced pair of stockings, and that by inventions in machinery, the same number of men can produce pair, or that they can continue to produce pair, and can produce besides hats; then the value of the pair of stockings; or of the pair of stockings, and hats, will be neither more nor less than that of the pair of stockings before the introduction of machinery; for they will be the produce of the same quantity of labour.