The Wealth of Nations by Part 4 Chapter 5 Page 92

concerning the other three branches of the corn trade.

II. The trade of the merchant importer of foreign corn for home consumption evidently contributes to the immediate supply of the home market, and must so far be immediately beneficial to the great body of the people. It tends, indeed, to lower somewhat the average money price of corn, but not to diminish its real value, or the quantity of labour which it is capable of maintaining. If importation was at all times free, our farmers and country gentlemen would, probably, one year with another, get less money for their corn than they do at present, when importation is at most times in effect prohibited; but the money which they got would be of more value, would buy more goods of all other kinds, and would employ more labour.