The Wealth of Nations by Part 1 Chapter 11 Page 22

enclosure is greater for pasture than for corn. It saves the labour of guarding the cattle, which feed better, too, when they are not liable to be disturbed by their keeper or his dog.

But where there is no local advantage of this kind, the rent and profit of corn, or whatever else is the common vegetable food or the people, must naturally regulate, upon the land which is fit for producing it, the rent and profit of pasture.

The use of the artificial grasses, of turnips, carrots, cabbages, and the other expedients which have been fallen upon to make an equal quantity of land feed a greater number of cattle than when in natural grass, should somewhat reduce, it might be expected, the superiority which, in an improved country, the price of butcher’s meat naturally has over that of bread.