Dr. Smith further observes on this subject: "When we are in want of necessaries, we must part with all superfluities, of which the value, as it rises in times of opulence and prosperity, so it sinks in times of poverty and distress." This is undoubtedly true; but he continues, "it is otherwise with necessaries. Their real price, the quantity of labour which they can purchase or command, rises in times of poverty and distress, and sinks in times of opulence and prosperity, which are always times of great abundance, for they could not otherwise be times of opulence and prosperity. Corn is a necessary, silver is only a superfluity." Two propositions are here advanced, which have no connexion with each other; one, that under the circumstances supposed, corn would command more labour, which is not disputed; the other, that corn would sell at a higher money price, that it would exchange for more silver; this I contend to be erroneous. It might be true, if corn were at the same time scarce, if the usual supply had not been furnished. But in this case it is abundant, it is not pretended that a less quantity than usual is imported, or that more is required. To purchase corn, the Dutch or Genoese want money, and to obtain this money, they are obliged to sell their superfluities. It is the market value and price of these superfluities which falls, and money appears to rise as compared with them. But this will not tend to increase the demand for corn, nor to lower the value of money, the only two causes which can raise the price of corn. Money, from a want of credit, and from other causes, may be in great demand, and consequently dear, comparatively with corn; but on no just principle can it be maintained, that under such circumstances money would be cheap, and therefore, that the price of corn would rise. When we speak of the high or low value of gold, silver, or any other commodity in different countries, we should always mention some medium in which we are estimating them, or no idea can be attached to the proposition. Thus, when gold is said to be dearer in England than in Spain, if no commodity is mentioned, what notion does the assertion convey? If corn, olives, oil, wine, and wool, be at a cheaper price in Spain than in England; estimated in those commodities, gold is dearer in Spain. If again, hardware, sugar, cloth, &c. be at a lower price in England than in Spain, then, estimated in those commodities, gold is dearer in England. Thus gold appears dearer or cheaper in Spain, as the fancy of the observer may fix on the medium by which he estimates its value. Adam Smith, having stamped corn and labour as an universal measure of value, would naturally estimate the comparative value of gold by the quantity of those two objects for which it would exchange: and, accordingly, when he speaks of the comparative value of gold in two countries, I understand him to mean its value estimated in corn and labour.