Two economic doctrines, separate in the world of false ideas, though their joint application in the world of practice has led many to confuse them, exercised a dominant influence in diminishing the quantity, and determining the quality of international trade in the eighteenth century. These doctrines had reference respectively to the construction and maintenance of home industries and the balance of trade. The former doctrine, which was not so much a consciously-evolved theory as a short-sighted, intellectual assumption driven by the urgent impulse of vested interests into practical effect, taught that, on the one hand, import trade should be restricted to commodities which were not and could not with advantage be produced at home, and to the provision of cheap materials for existing manufactures; while export trade, on the other hand, should be generally encouraged by a system of bounties and drawbacks. This doctrine was first rigidly applied by the French minister, Colbert, but the policy of France was faithfully copied by England and other commercial nations and ranked as an orthodox theory of international trade. The Balance of Trade doctrine estimated the worth of a nation's intercourse with another by the excess of the export over the import trade, which brought a quantity of bullion into the exporting country. This theory was also widely spread, though obviously its general application would have been destructive of all international commerce. The more liberal interpretation of the doctrine was satisfied with a favourable balance of the aggregate export over the aggregate import trade of the country, but the stricter interpretation, generally dominant in practice, required that in the case of each particular nation the balance should be favourable. In regarding England's commerce with a foreign nation, any excess in import values over export was spoken of as "a loss to England." England deliberately cut off all trade with France during the period 1702 to 1763 by a system of prohibitive tariffs urged by a double dread lest the balance should be against us, and lest French textile goods might successfully compete with English goods in the home markets. On the other hand, we cultivated trade with Portugal because "we gain a greater balance from Portugal than from any other country whatever." The practical policy prevalent in 1713 is thus summarised by one of its enthusiastic upholders--"We suffer the goods and merchandises of Holland, Germany, Portugal, and Italy to be imported and consumed among us; and it is well we do, for we expect a much greater value of our own to those countries than we take from them. So that the consumption of those nations pays much greater sums to the rents of our lands and the labour of our people than ours does to theirs. But we keep out as much as possible the goods and merchandises of France, because our consumption of theirs would very much hinder the consumption of our