Producer's Surplus is a convenient name for the genus of which the rent of land is the leading species.
Capital is that part of wealth which is devoted to obtaining further wealth.
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.
Political Economy or Economics is a study of mankind in the ordinary business of life.