Consumption may be regarded as negative production.

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

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.

Political Economy or Economics is a study of mankind in the ordinary business of life.

We might as well reasonably dispute whether it is the upper or the under blade of a pair of scissors that cuts a piece of paper, as whether value is governed by demand or supply.

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.

Knowledge is our most powerful engine of production.