The Wealth of Nations by Part 5 Chapter 2 Page 213

advantage than at present. If those commodities were delivered out of the public warehouse for foreign exportation, being in this case exempted from all taxes, the trade in them would be perfectly free. The carrying trade in all sorts of goods would under this system enjoy every possible advantage. If those commodities were delivered out for home consumption, the importer not being obliged to advance the tax till he had an opportunity of selling his goods, either to some dealer, or to some consumer, he could always afford to sell them cheaper than if he had been obliged to advance it at the moment of importation.

Under the same taxes, the foreign trade of consumption even in the taxed commodities might in this manner be carried on with much more advantage than it can be at present.