A public granary of corn, a storehouse of cloth, a magazine of arms; all these must be allowed real riches and strength in any state. Trade and industry are really nothing but a stock of labour, which, in time of peace and tranquillity, is employed for the ease and satisfaction of individuals; but in the exigencies of state, may, in part, be turned to public advantage. Could we convert a city into a kind of fortified camp, and infuse into each breast so martial a genius, and such a passion for public good, as to make every one willing to undergo the greatest hardships for the sake of the public, these affections might now, as in ancient times, prove alone a sufficient spur to industry, and support the community. It would then be advantageous, as in camps, to banish all arts and luxury; and, by restrictions on equipage and tables, make the provisions and forage last longer than if the army were loaded with a number of superfluous retainers. But as these principles are too disinterested and too difficult to support, it is requisite to govern men by other passions, and animate them with a spirit of avarice and industry, art and luxury. The camp is, in this case, loaded with a superfluous retinue; but the provisions flow in proportionately larger. The harmony of the whole is still supported, and the natural bent of the mind being more complied with, individuals, as well as the public, find their account in the observance of those maxims. The same method of reasoning will let us see the advantage of foreign commerce, in augmenting the power of the state, as well as the riches and happiness of the subjects. It increases the stock of labour in the nation, and the sovereign may convert what share of it he finds necessary to the service of the public. Foreign trade, by its imports, furnishes materials for new manufactures; and by its exports, it produces labour in particular commodities which could not be consumed at home. In short, a kingdom that has a large import and export must abound more with industry, and that employed upon delicacies and luxuries, than a kingdom which rests contented with its native commodities. It is, therefore, more powerful, as well as richer and happier. The individuals reap the benefit of these commodities, so far as they gratify the senses and appetites. And the public is also a gainer, while a greater stock of labour is, by this means, stored up against any public exigency; that is, a greater number of laborious men are maintained, who may be diverted to the public service without robbing any one of the necessaries or even the chief conveniences of life.