The Wealth of Nations by Part 4 Chapter 6 Page 10

still greater sum than Mr. Baretti seems to imagine; this trade would not, upon that account, be more advantageous than any other in which, for the same value sent out, we received an equal value of consumable goods in return.

It is but a very small part of this importation which, it can be supposed, is employed as an annual addition either to the plate or to the coin of the kingdom. The rest must all be sent abroad and exchanged for consumable goods of some kind or other. But if those consumable goods were purchased directly with the produce of English industry, it would be more for the advantage of England than first to purchase with that produce the gold of Portugal, and afterwards to purchase with that gold those consumable goods. A direct foreign trade of consumption is always more advantageous than a round-about one;