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. ”