The Wealth of Nations by Part 2 Chapter 1 Page 16

to those who are finally to use or to consume them.

Of these four parts, three- provisions, materials, and finished work- are, either annually, or in a longer or shorter period, regularly withdrawn from it, and placed either in the fixed capital or in the stock reserved for immediate consumption.

Every fixed capital is both originally derived from, and requires to be continually supported by a circulating capital. All useful machines and instruments of trade are originally derived from a circulating capital, which furnishes the materials of which they are made, and the maintenance of the workmen who make them.

They require, too, a capital of the same kind to keep them in constant repair.

No fixed capital can yield any