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.
Alfred MarshallMaterial 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.
Alfred MarshallAgain, most of the chief distinctions marked by economic terms are differences not of kind but of degree.
Alfred MarshallIt is common to distinguish necessaries, comforts, and luxuries; the first class including all things required to meet wants which must be satisfied, while the latter consist of things that meet wants of a less urgent character.
Alfred Marshall