Alfred Marshall

Material goods consist of useful material things, and of all rights to hold, or use, or derive benefits from material things, or to receive them at a future time.

Capital is that part of wealth which is devoted to obtaining further wealth.

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.

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

Civilized countries generally adopt gold or silver or both as money.

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.

But if inventions have increased man's power over nature very much, then the real value of money is better measured for some purposes in labour than in commodities.

And very often the influence exerted on a person's character by the amount of his income is hardly less, if it is less, than that exerted by the way in which it is earned.

Producer's Surplus is a convenient name for the genus of which the rent of land is the leading species.

Slavery was regarded by Aristotle as an ordinance of nature, and so probably was it by the slaves themselves in olden time.

The price of every thing rises and falls from time to time and place to place; and with every such change the purchasing power of money changes so far as that thing goes.