This is no more than the principle before laid down, in the fifteenth chapter, reversed: there we said, that when foreign demand begins to decline, domestic luxury must be made to increase, in order to soften the shock of the sudden revolution in favour of the industrious. For the same reason here we say, that foreign trade must be opened upon every diminution of domestic luxury. How few Princes do we find either frugal or magnificent from political considerations! And, this being the case, is it not necessary to lay before them the natural consequences of the one and the other? And it is still more necessary to point out the methods to be taken in order to avoid the inconveniencies which may proceed from either. Under a prodigal administration, the number of people will increase. The statesman therefore should keep a watchful eye upon the supplying of subsistence. Under a frugal reign, numbers will diminish, if the statesman does not open every channel which may carry off the superfluous productions of industry. Here is the reason: a diminution of expence at home, is a diminution of employment; and this again implies a diminution of people; because it interrupts the circulation of the subsistence which made them live; but if employment is sent far from abroad, the nation will preserve its people, and the savings of the Prince may be compensated by the balance coming in from strangers. These topics are delivered only as hints; and the amplification of them might not improperly have a place here; but I expect to bring them in elsewhere to greater advantage, after examining the principles of taxation, and pointing out those which direct the application of public money. ------------------------------------------------------------------------ CHAP. XVIII. _Methods of lowering the Price of Manufactures, in order to make them vendible in foreign Markets._ The multiplicity of relations between the several parts of political oeconomy, forces me to a frequent repetition of principles. I have no other rule to judge whether such relations be superfluous, or necessary, but by the tendency they have to give me a more distinct view of my subject. This is the case when the same principles are applied to different combinations of circumstances. Almost every thing to be said on the head mentioned in the title of this chapter, has been taken notice of elsewhere; and my present intention is only to lay together ideas which appear scattered, because they have been occasionally brought in by their relations to other matters. The methods of lowering the price of manufactures, so as to render them exportable, are of two kinds. The first, such as proceed from a good administration, and which bring down prices within the country, in consequence of natural causes. The second, such as operate only upon that part which comes to be exported, in consequence of a proper application of public money.