The Wealth of Nations by Part 2 Chapter 3 Page 28

commodities, its effect upon the productive funds of the society would still be the same. Every year there would still be a certain quantity of food and clothing, which ought to have maintained productive, employed in maintaining unproductive hands. Every year, therefore, there would still be some diminution in what would otherwise have been the value of the annual produce of the land and labour of the country.

This expense, it may be said indeed, not being in foreign goods, and not occasioning any exportation of gold and silver, the same quantity of money would remain in the country as before. But if the quantity of food and clothing, which were thus consumed by unproductive, had been distributed among productive hands, they would have reproduced, together with a profit, the full value of their consumption.