If the balance be even, and if the trade between the two places consist altogether in the exchange of their native commodities, they will, upon most occasions, not only both gain, but they will gain equally, or very nearly equally; each will, in this case, afford a market for a part of the surplus produce of the other; each will replace a capital which had been employed in raising and preparing for the market this part of the surplus produce of the other, and which had been distributed among, and given revenue and maintenance to, a certain number of its inhabitants. Some part of the inhabitants of each, therefore, will directly derive their revenue and maintenance from the other. As the commodities exchanged, too, are supposed to be of equal value, so the two capitals employed in the trade will, upon most occasions, be equal, or very nearly equal; and both being employed in raising the native commodities of the two countries, the revenue and maintenance which their distribution will afford to the inhabitants of each will be equal, or very nearly equal. This revenue and maintenance, thus mutually afforded, will be greater or smaller, in proportion to the extent of their dealings. If these should annually amount to £100,000, for example, or to £1,000,000, on each side, each of them will afford an annual revenue, in the one case, of £100,000, and, in the other, of £1,000,000, to the inhabitants of the other.
If their trade should be of such a nature, that one of them exported to the other nothing but native commodities, while the returns of that other consisted altogether in foreign goods; the balance, in this case, would still be supposed even, commodities being paid for with commodities. They would, in this case too, both gain, but they would not gain equally; and the inhabitants of the country which exported nothing but native commodities, would derive the greatest revenue from the trade. If England, for example, should import from France nothing but the native commodities of that country, and not having such commodities of its own as were in demand there, should annually repay them by sending thither a large quantity of foreign goods, tobacco, we