The Wealth of Nations by Part 4 Chapter 3 Page 55

exportation of gold and silver than by the exportation of an equal value of any other goods. On the contrary, it would in most cases be augmented. No goods are sent abroad but those for which the demand is supposed to be greater abroad than at home, and of which the returns consequently, it is expected, will be of more value at home than the commodities exported. If the tobacco which, in England, is worth only a hundred thousand pounds, when sent to France will purchase wine which is, in England, worth a hundred and ten thousand, this exchange will equally augment the capital of England by ten thousand pounds. If a hundred thousand pounds of English gold, in the same manner, purchase French wine which, in England, is worth a hundred and ten thousand, this exchange will equally augment the capital of England by ten thousand pounds.