In these remarks I entirely agree with Mr. Ricardo. If riches consist of the necessaries, conveniencies, and luxuries of life, and the same quantity of labour will at different times, and under different circumstances, produce a very different quantity of the necessaries, conveniencies, and luxuries of life, then it is quite clear that the power of commanding labour, and the power of commanding the necessaries, conveniencies and luxuries of life are essentially distinct. One, in fact, is a description of value, and the other of wealth. But though Mr. Ricardo has fully succeeded in showing that Adam Smith was incorrect in confounding wealth and value, even according to his own descriptions of them; yet he has nowhere succeeded in making out the propriety of that peculiar view of value which forms the most prominent feature of his work. He has not confined himself to the assertion, that what he calls the value of a commodity is determined by the quantity of labour worked up in it; but he states, in substance, the following proposition, that commodities exchange with each other according to the quantity of manual labour worked up in them, including the labour worked up in the materials and tools consumed in their production, as well as that which is more immediately employed.[7] Now this proposition is contradicted by universal experience. The slightest observation will serve to convince us, that after making all the required allowances for temporary deviations from the natural and ordinary course of things, the class of commodities subject to this law of exchange is most extremely confined, while the classes, not subject to it, embrace the great mass of commodities. Mr. Ricardo, indeed, himself admits of considerable exceptions to his rule; but if we examine the classes which come under his exceptions, that is, where the quantities of fixed capital employed are different and of different degrees of duration, and where the periods of the returns of the circulating capital employed are not the same, we shall find that they are so numerous, that the rule may be considered as the exception, and the exceptions the rule.