The Wealth of Nations by Part 5 Chapter 2 Page 201

cent upon what remains of that revenue after deducting what is paid away in bounties and drawbacks.

Heavy duties being imposed upon almost all goods imported, our merchant importers smuggle as much and make entry of as little as they can.

Our merchant exporters, on the contrary, make entry of more than they export; sometimes out of vanity, and to pass for great dealers in goods which pay no duty, and sometimes to gain a bounty or a drawback. Our exports, in consequence of these different frauds, appear upon the customhouse books greatly to overbalance our imports, to the unspeakable comfort of those politicians who measure the national prosperity by what they call the balance of trade.

All goods imported, unless particularly exempted, and such