Knowledge is our most powerful engine of production.

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.

In common use almost every word has many shades of meaning, and therefore needs to be interpreted by the context.

Every short statement about economics is misleading (with the possible exception of my present one).

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.

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

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