The love for money is only one among many.

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

I admit that these terms and the diagrams connected with them repel some readers, and fill others with the vain imagination that they have mastered difficult economics problems, when really they have done little more than learn the language in which parts of those problems can be expressed, and the machinery by which they can be handled. When the actual conditions of particular problems have not been studied, such knowledge is little better than a derrick for sinking oil-wells erected where there are no oil-bearing strata.

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.

Individual and national rights to wealth rest on the basis of civil and international law, or at least of custom that has the force of law.

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.

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.