Inland commerce, as here pointed out, is supposed to take place upon the total extinction of foreign trade. The statesman must in such a case, as in the other two species, attend to supplying the wants of the rich, in relieving the necessities of the poor, by the circulation of the equivalent as above; but as formerly he had it in his eye to watch over the balance of work and demand, so now he must principally attend to the balance of wealth, as it vibrates between consumers and manufacturers; that is, between the rich and the industrious. The effects of this vibration have been shortly pointed out, Chap. xv. In conducting a foreign trade, his business was to establish the lowest standard possible as to prices; and to confine profits within the narrowest bounds: but as now there is no question of exportation, this object of his care in a great measure disappears; and high profits made by the industrious will have then no other effect than to draw the balance of wealth more speedily to their side. The higher the profits, the more quickly will the industrious be enriched, the more quickly will the consumers become poor, and the more necessary will it become to cut off the nation from every foreign communication in the way of trade. From this political situation of a state arises the fundamental principle of taxation; which is, _that, at the time of the vibration of the balance between the consumer and the manufacturer, the state should advance the dissipation of the first, and share in the profits of the latter_. This branch of our subject I shall not here anticipate; but I shall, in the remaining chapters of this book, make it sufficiently evident, that so soon as the wealth of a state becomes considerable enough to introduce luxury, to put an end to foreign trade, and from the excessive rise of prices to extinguish all hopes of restoring it, then taxes become necessary, both for preserving the government on the one hand, and on the other, to serve as an expedient for recalling foreign trade in spite of all the pernicious effects of luxury to extinguish it. I hope from this short recapitulation and exposition of principles, I have sufficiently communicated to my reader the distinctions I wanted to establish, between what I have called infant, foreign, and inland trade. Such distinctions are very necessary to be retained; and it is proper they should be applied in many places of this treatise, in order to qualify general propositions: these cannot be avoided, and might lead into error, without a perpetual repetition of such restrictions, which would tire the reader, appear frivolous to him, perhaps, and divert his attention. I only add, that we are not to suppose the commerce of any nation restricted to any one of the three species. I have considered them separately, according to custom, in order to point out their different principles. It is the business of statesmen to compound them according to circumstances.