John Trenchard, Cato's Letter No. 106 — Of Plantations and Colonies…
“ No nation has, or ever had, all the materials of commerce within itself: No climate produces all commodities; and yet it is the interest, pleasure, or convenience, of every people, to use or trade in most or all of them; and rather to raise them themselves, than to purchase them from others, unless in some instances, when they change their own commodities for them, and employ as many or more people at home in that exchange, such as would lose their employment by purchasing them from abroad. Now, colonies planted in proper climates, and kept to their proper business, undoubtedly do this ”
