Capital is that part of wealth which is devoted to obtaining further wealth.
Alfred Marshall

Consumption may be regarded as negative production.
Alfred Marshall

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

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.
Alfred Marshall

It is common to distinguish necessaries, comforts, and luxuries; the first class including all things required to meet wants which must be satisfied, while the latter consist of things that meet wants of a less urgent character.
Alfred Marshall

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.
Alfred Marshall

The hope that poverty and ignorance may gradually be extinguished, derives indeed much support from the steady progress of the working classes during the nineteenth century.
Alfred Marshall