when the paper is exchangeable at pleasure for the metals that paper prices and metallic prices must correspond.
Let us suppose that the United States is the country which has the depreciated paper. Suppose that some American production could be bought, while the currency was still metallic, for $25, and sold in England for $27.50, the difference covering the expense and risk, and affording a profit to the merchant. On account of the depreciation, this commodity will now cost in the United States $30, and can not be sold in England for more than $27.50, and yet it will be exported as before. Why? Because the $27.50 which the exporter can get for it in England is not depreciated paper, but gold or silver; and since in the United States bullion has risen in the same proportion with other things—if the merchant brings the gold or silver to the United States, he can sell his $27.50 [in coin] for $33 [in paper], and obtain as before 10 per cent for profit and expenses.
It thus appears that a depreciation of the currency does not affect the foreign trade of the country: this is carried on precisely as if the currency maintained its value. But, though the trade is not affected, the exchanges are. When the imports and exports are in equilibrium, the exchange, in a metallic currency, would be at par; a bill on England for the equivalent of $25 would be worth $25. But $25, or the quantity of gold contained in them, having come to be worth in the United States $30, it follows that a bill on England for $25 will be worth $30. When, therefore, the real exchange is at par, there will be a nominal exchange against the country of as much per cent as the amount of the depreciation. If the currency is depreciated 10, 15, or 20 per cent, then in whatever way the real exchange, arising from the variations of international debts and credits, may