Although I admit, that from the nature of rent, a given capital employed in agriculture, on any but the land last cultivated, puts in motion a greater quantity of labour than an equal capital employed in manufactures and trade, yet I cannot admit that there is any difference in the quantity of labour employed by a capital engaged in the home trade, and an equal capital engaged in the foreign trade.
"The capital which sends Scots manufactures to London, and brings back English corn and manufactures to Edinburgh," says Adam Smith, "necessarily replaces, by every such operation, two British capitals which had both been employed in the agriculture or manufactures of Great Britain.
"The capital employed in purchasing foreign goods for home consumption, when this purchase is made with the produce of domestic industry, replaces too, by every such operation, two distinct capitals; but one of them only is employed in supporting domestic industry. The capital which sends British goods to Portugal, and brings back Portuguese goods to Great Britain, replaces, by every such operation, only one British capital, the other is a Portuguese one. Though the returns, therefore, of the foreign trade of consumption should be as quick as the home trade, the capital employed in it will give but one half the encouragement to the industry or productive labour of the country."
This argument appears to me to be fallacious; for though two capitals, one Portuguese and one English, be employed, as Dr. Smith supposes, still a capital will be employed in the foreign trade, double of what would be employed in the home trade. Suppose that Scotland employs a capital of a thousand pounds in making linen, which she exchanges for the produce of a similar capital employed in making silks in England. Two thousand pounds, and a proportional quantity of labour will be employed by the two countries. Suppose now, that England discovers, that she can import more linen from Germany, for the silks which she