foreign trades cannot be conveniently driven without the species of money and bullion, and that it is found, by experience, that the species of money and bullion are carried in greatest abundance, as to a common market, to such places as give free liberty of exporting the same, _and the better to keep in and increase the current coins of this kingdom_, be it enacted, that it shall be lawful to export all sorts of foreign coin and bullion, first entering the same at the custom-house.” The art of Political Economy now became more complex. Its object, indeed, was a very simple one, merely to increase the current coin of the country; but this was to be effected, not by restraining every trade which carried out bullion, but only those which carried out more than they brought in. But how were such trades to be detected? A test was supposed to be applied, by ascertaining whether their imports were intended for home consumption, or for re-exportation. In the former case, the trade, whether profitable or not to the merchant, was obviously mischievous to the country. In the second case the trade, if profitable to the merchant, must also benefit the country, as it would receive more money than it sent out. “It is not,” says Sir James Stewart[B], “by the importation of foreign commodities, and by the exportation of gold and silver, that a nation becomes poor; it is by consuming those commodities when imported. The moment the consumption begins, the balance turns. Nations which trade to India by sending out gold and silver for a return of superfluities of a most consumable nature, the consumption of which they prohibit at home, do not spend their own specie, but that of their neighbours, who purchase the returns of it for their own consumption. Consequently a nation may become immensely rich by the constant exportation of specie and importation of consumable commodities. But she would do well to beware not to resemble the milliner who took it into her head to wear the fine laces which she used to make up for her customers. While a favourable balance is preserved upon foreign trade, a nation grows richer daily; and when one nation grows richer, others must be growing poorer.” [B] An Inquiry into the Principles of Political Economy, book ii. ch. xxix. pp. 418, 419, and 422.