“Wealth is a function of accumulated man hours. And in another way, wealth is the ability to command the labor of another—the ability to tap into some portion of those available man hours. This accumulation of man hours can come in one of two forms, or in a combination of the two. The first is a large enough population size to all any specialist to be summoned, and the second is the incarnation of a specialist’s knowledge in a tool.”
Ploductivity, pp. 51-52