The most reckless and treacherous of all theorists is he who professes to let facts and figures speak for themselves.

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.

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

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.

In the absence of any short term in common use to represent all desirable things, or things that satisfy human wants, we may use the term Goods for that purpose.

All labour is directed towards producing some effect.

But if inventions have increased man's power over nature very much, then the real value of money is better measured for some purposes in labour than in commodities.