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.

It 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.

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.

Though a simple book can be written on selected topics, the central doctrines of economics are not simple and cannot be made so.

Knowledge is our most powerful engine of production.

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

All labour is directed towards producing some effect.