The Wealth of Nations by Part 4 Chapter 7 Page 115

consist altogether in those peculiar advantages which are supposed to result from provinces of so very peculiar a nature as the European colonies of America; and the exclusive trade, it is acknowledged, is the sole source of all those peculiar advantages.

In consequence of this exclusive trade, all that part of the surplus produce of the English colonies, for example, which consists in what are called enumerated commodities, can be sent to no other country but England. Other countries must afterwards buy it of her. It must be cheaper therefore in England than it can be in any other country, and must contribute more to increase the enjoyments of England than those of any other country.

It must likewise contribute more to encourage her industry. For all those parts of her own surplus