The Wealth of Nations by Part 2 Chapter 1 Page 8

society is the same with that of all its inhabitants or members, and therefore naturally divides itself into the same three portions, each of which has a distinct function or office.

The first is that portion which is reserved for immediate consumption, and of which the characteristic is, that it affords no revenue or profit. It consists in the stock of food, clothes, household furniture, etc., which have been purchased by their proper consumers, but which are not yet entirely consumed. The whole stock of mere dwelling-houses too, subsisting at any one time in the country, make a part of this first portion. The stock that is laid out in a house, if it is to be the dwellinghouse of the proprietor, ceases from that moment to serve in the function of a capital, or to afford any revenue to its owner.