The Wealth of Nations by Part 5 Chapter 2 Page 210

importation of only a few sorts of goods of the most general use and consumption, and that the duties of customs might thus be brought to the same degree of simplicity, certainty, and precision as those of excise.

What the revenue at present loses by drawbacks upon the re-exportation of foreign goods which are afterwards relanded and consumed at home would under this system be saved altogether. If to this saving, which would alone be very considerable, were added the abolition of all bounties upon the exportation of home produce in all cases in which those bounties were not in reality drawbacks of some duties of excise which had before been advanced, it cannot well be doubted but that the net revenue of customs might, after an alteration of this kind, be fully equal to what it had ever been before.