The Wealth of Nations by Part 5 Chapter 2 Page 243

It might, perhaps, be a little difficult to ascertain either what sort or what degree of absence would subject a man to be taxed as an absentee, or at what precise time the tax should either begin or end. If you except, however, this very peculiar situation, any inequality in the contribution of individuals which can arise from such taxes is much more than compensated by the very circumstance which occasions that inequality- the circumstance that every man’s contribution is altogether voluntary, it being altogether in his power either to consume or not to consume the commodity taxed. Where such taxes, therefore, are properly assessed, and upon proper commodities, they are paid with less grumbling than any other. When they are advanced by the merchant or manufacturer, the consumer, who finally pays them, soon comes to confound them with the price of