the nature of their theory. In his work on political economy, Ricardo repeated and developed further the same views, but nowhere has he investigated the nature of money as such, as he had done in the case of exchange value, profit, rent, etc.
To begin with, Ricardo determines the value of gold and silver, like that of all other commodities, by the quantity of labor-time embodied in them.134 By means of them, as commodities of a given value, the values of all other commodities are measured.135 The volume of the circulating medium in a country is determined by the value of the unit of measure of money on the one hand, and by the sum total of the exchange values of commodities, on the other. This quantity is modified by economy in the method of payment.136 Since the quantity of money, of a given value, which can be absorbed by circulation, is thus determined and since the value of money within the sphere of circulation manifests itself only in its quantity, it follows that mere tokens of value, if issued in proportions determined by the value of money, may replace it in circulation, and in fact, “a currency is in its most perfect state when it consists wholly of paper money, but of paper money of an equal value with the gold which it professes to represent.”137 So far Ricardo determines the volume of the circulating medium by the prices of commodities, assuming the value of money to be given; money as a token of value means with him a token of a definite quantity of gold and not a mere worthless representative of commodities as was the case with Hume.