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 plies it much the most frequently, and on which he evidently lays the chief stress. "The value of any commodity," he says, "to the person who possesses it, and who means not to use or consume it himself, but to exchange it for other commodities, is equal to the quantity of labour which it enables him to purchase or command. Labour, therefore, is the real measure of the exchangeable value of all commodities." Other expressions in the same chapter apply labour as a measure of value in the same way; and on another occasion, in his digression on the value of silver during the four last centuries, he takes an opportunity to say, "Labour, be it remembered, and not any commodity, or mass of commodities, is the sole measure of the value of silver, and of all other commodities."

These passages may be said to determine the prevailing sense in which he considers labour as a general measure of exchangeable value. It would not then be worth while to inquire how far labour may be considered as a measure of value, when applied in the way which Adam Smith has practically rejected in reference to the more advanced stages of society, if this mode of applying it had not been adopted by some distinguished modern writers as the foundation of a new theory of value. But as this is the case, the inquiry seems to be called for; and it should be particularly noticed, that the question embraces not merely the propriety of a definition, but the truth of a proposition. It is not merely what should be the definition and the measure of value in exchange, but a question of fact, whether the labour worked up in commodities either determines or measures the rate at which they exchange with each other; and in no stage of society with which we are acquainted does it do this. At a very early period profits will be found to enter largely into the question of exchangeable value as a necessary condition of the supply. To make