the general progress of opinion; and few of the enactments which were once grounded on those theories still help to deform the statute-book. As the principles on which their condemnation rests have been fully set forth in other parts of this Treatise, we may here content ourselves with a few brief indications.
Of these false theories, the most notable is the doctrine of Protection to Native Industry; a phrase meaning the prohibition, or the discouragement by heavy duties, of such foreign commodities as are capable of being produced at home. If the theory involved in this system had been correct, the practical conclusions grounded on it would not have been unreasonable. The theory was, that to buy things produced at home was a national benefit, and the introduction of foreign commodities generally a national loss. It being at the same time evident that the interest of the consumer is to buy foreign commodities in preference to domestic whenever they are either cheaper or better, the interest of the consumer appeared in this respect to be contrary to the public interest; he was certain, if left to his own inclinations, to do what according to the theory was injurious to the public.
It was shown, however, in our analysis of the effects of international trade, as it had been often shown by former writers, that the importation of foreign commodities, in the common course of traffic, never takes place, except when it is, economically speaking, a national good, by causing the same amount of commodities to be obtained at a smaller cost of labour and capital to the country. To prohibit, therefore, this importation, or impose duties which prevent it, is to render the labour and capital of the country less efficient in production than they would otherwise be; and compel a waste, of the difference between the labour and capital necessary for the home production of the commodity, and that which is required for producing the things with which it can be purchased from abroad. The amount of national loss thus occasioned is measured by the excess of the price at which the commodity
