Section V. The Commodities Imported are the Cause of the Benefits Derived from a Foreign Trade

From what is stated in the preceding chapter, one general, or rather universal, proposition may be deduced. The benefit which is derived from exchanging one commodity for another, arises, in all cases, from the commodity received, not from the commodity given. When one country exchanges, in other words, when one country traffics with another, the whole of its advantage consists in the commodities imported. It benefits by the importation, and by nothing else.

This seems to be so very nearly a self-evident proposition, as to be hardly capable of being rendered more clear by illustration; and yet it is so little in harmony with current and vulgar opinions, that it may not be easy by any illustration, to gain it admission into certain minds.

When a man possesses a certain commodity, he cannot benefit himself by giving it away. It seems to be implied, therefore, in the very fact of his parting with it for another commodity, that he is benefited by what he receives. His own commodity be might have kept, if it had been valued by him more than that for which he exchanges it. The fact of his choosing to have the other commodity rather than his own, is a proof that the other is to him more valuable than his own.

The corresponding facts are evidence equally conclusive in the case of nations. When one nation exchanges a part of its commodities for a part of the commodities of another nation, the nation can gain nothing by parting with its commodities; all the gain must consist in what it receives. If it be said that the gain consists in receiving money, it will presently appear, from the doctrine of money, that a nation derives no advantage, but the contrary, from possessing more than its due proportion of the precious metals.

In importing commodities which the country itself is competent to produce, as in the case, supposed above, of trade with Poland, we saw that England would import her corn from Poland, if she thus obtained, with the produce of so many days' labour in cloth, as much corn as it would have required a greater number of days' labour to produce in England. If it had so happened, that she could procure in Poland with the cloth, only as much corn as she could produce with the same quantity of labour at home, she would have had no advantage in the transaction. Her advantage would arise, not from what she should export, but wholly from what she should import.

The case in which a country imports commodities, which she herself is incompetent to produce, is of still more simple investigation. That country, or, more properly speaking, the people of that country, have certain commodities of their own, but these they are willing to give for certain commodities of other countries. They prefer having those other commodities. They are benefited, therefore, not by what they give away; that it would be absurd to say; but by what they receive.