The Wealth of Nations by Part 4 Chapter 8 Page 37

much. It would afford a sufficient advantage to the manufacturer, because, though he might not buy his wool altogether so cheap as under the prohibition, he would still buy it, at least, five or ten shillings cheaper than any foreign manufacturer could buy it, besides saving the freight and insurance, which the other would be obliged to pay. It is scarce possible to devise a tax which could produce any considerable revenue to the sovereign, and at the same time occasion so little inconveniency to anybody.

The prohibition, notwithstanding all the penalties which guard it, does not prevent the exportation of wool. It is exported, it is well known, in great quantities.

The great difference between the price in the home and that in the foreign market presents such a temptation to smuggling