The one assumption is as relevant as the other for the purpose of determining the relation between the sum total of prices of commodities and the volume of currency. Mill feels that it is a matter of decisive importance to him to bring the commodities in direct contact not with the money in circulation, but with the entire supply of money existing in a country. He admits that “the whole of the goods of a country are not exchanged at once against the whole of the money,” but that the goods are exchanged in different portions and at different times of the year for different portions of money. To do away with this difficulty he _assumes_ that it does not exist. Moreover, this entire idea of direct contact of commodities and money and direct exchange is a mere abstraction from the movement of simple purchase and sale or the function of money as a means of purchase. Already in the movement of money as a means of payment, commodity and money cease to appear simultaneously. The commercial crises of the nineteenth century, namely, the great crises of 1825 and 1836, did not result in any new developments in the Ricardian theory of money, but they did furnish new applications for it. They were no longer isolated economic phenomena, such as the depreciation of the precious metals in the sixteenth and seventeenth centuries which interested Hume, or the depreciation of paper money in the eighteenth and early nineteenth centuries which confronted Ricardo; they were the great storms of the world market in which the conflict of all the elements of the capitalist process of production discharge themselves, and whose origin and remedy were sought in the most superficial and abstract sphere of this process, the sphere of money circulation. The theoretical assumption from which the school of economic weather prophets proceeds, comes down in the end to the illusion that Ricardo discovered the laws governing the circulation of purely metallic currency. The only thing that remained for them to do was to subject to the same laws the circulation of credit and bank-note currency.