The Wealth of Nations by Part 2 Chapter 5 Page 41

When the foreign goods which are thus purchased with the surplus produce of domestic industry exceed the demand of the home market, the surplus part of them must be sent abroad again and exchanged for something more in demand at home. About ninety-six thousand hogsheads of tobacco are annually purchased in Virginia and Maryland with a part of the surplus produce of British industry. But the demand of Great Britain does not require, perhaps, more than fourteen thousand. If the remaining eighty-two thousand, therefore, could not be sent abroad and exchanged for something more in demand at home, the importation of them must cease immediately, and with it the productive labour of all those inhabitants of Great Britain, who are at present employed in preparing the goods with which these eighty-two thousand hogsheads are annually purchased.