The Wealth of Nations by Part 4 Chapter 8 Page 16

never become a farthing the poorer by any expense which we could lay out upon them.

They were our own in every respect, and it was an expense laid out upon the improvement of our own property and for the profitable employment of our own people. It is unnecessary, I apprehend, at present to say anything further in order to expose the folly of a system which fatal experience has now sufficiently exposed. Had our American colonies really been a part of Great Britain, those bounties might have been considered as bounties upon production, and would still have been liable to all the objections to which such bounties are liable, but to no other.

The exportation of the materials of manufacture is sometimes discouraged by absolute prohibitions, and sometimes by high duties.