All labour is directed towards producing some effect.

Again, most of the chief distinctions marked by economic terms are differences not of kind but of degree.

The most valuable of all capital is that invested in human beings

In the absence of any short term in common use to represent all desirable things, or things that satisfy human wants, we may use the term Goods for that purpose.

All wealth consists of desirable things; that is, things which satisfy human wants directly or indirectly: but not all desirable things are reckoned as wealth.

Individual and national rights to wealth rest on the basis of civil and international law, or at least of custom that has the force of law.

Nature's action is complex: and nothing is gained in the long run by pretending that it is simple, and trying to describe it in a series of elementary propositions.