Page:The wealth of nations, volume 1.djvu/370

 be augmented at all. The extension of improvement and cultivation, as it necessarily raises more or less, in proportion to the price of corn, that of every sort of animal food, so it as necessarily lowers that of, I believe, every sort of vegetable food. It raises the price of animal food; because a great part of the land which produces it, being rendered fit for producing corn, must afford to the landlord and farmer the rent and profit of corn land. It lowers the price of vegetable food; because, by increasing the fertility of the land, it increases its abundance. The improvements of agriculture, too, introduce many sorts of vegetable food, which, requiring less land and not more labor than corn, come much cheaper to market. Such are potatoes and maize, or what is called Indian corn, the two most important improvements which the agriculture of Europe, perhaps which Europe itself, has received from the great extension of its commerce and navigation. Many sorts of vegetable food, besides, which in the rude state of agriculture are confined to the kitchen garden, and raised only by the spade, come in its improved state to be introduced into common fields, and to be raised by the plow; such as turnips, carrots, cabbages, etc. If in the progress of improvement, therefore, the real price of one species of food necessarily rises, that of another as necessarily falls, and it becomes a matter of more nicety to judge how far the rise in the one may be compensated by the fall in the other. When the real price of butcher's meat has once got to its height (which, with regard to every sort, except, perhaps, that of hog's flesh, it seems to have done through a great part of England more than a century ago), any rise which can afterward happen in that of any other sort of animal food, cannot much affect the circumstances of the inferior