The Wealth of Nations by Part 4 Chapter 7 Page 248

people. The greater the revenue of the people, therefore, the greater the annual produce of their land and labour, the more they can afford to the sovereign. It is his interest, therefore, to increase as much as possible that annual produce. But if this is the interest of every sovereign, it is peculiarly so of one whose revenue, like that of the sovereign of Bengal, arises chiefly from a land-rent. That rent must necessarily be in proportion to the quantity and value of the produce, and both the one and the other must depend upon the extent of the market. The quantity will always be suited with more or less exactness to the consumption of those who can afford to pay for it, and the price which they will pay will always be in proportion to the eagerness of their competition.

It is the interest of such a sovereign,