The Wealth of Nations by Part 4 Chapter 7 Page 111

produce. By rendering the produce of all other countries dearer in the colonies, it cramps, in the same manner the industry of all other countries, and both the enjoyments and the industry of the colonies.

It is a clog which, for the supposed benefit of some particular countries, embarrasses the pleasures and encumbers the industry of all other countries; but of the colonies more than of any other. It not only excludes, as much as possible, all other countries from one particular market; but it confines, as much as Possible, the colonies to one particular market; and the difference is very great between being excluded from one particular market, when all others are open, and being confined to one particular market, when all others are shut up. The surplus produce of the colonies, however, is the original source of all