It is common to distinguish ...

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.
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 Alfred Marshall

Quotes from the same author

Nature's action is complex: and nothing is gained in the long run by pretending that it is simple, and trying to describe it in a series of elementary propositions.
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 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 19th century.
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 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.
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 Alfred Marshall
Civilized countries generally adopt gold or silver or both as money.
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 Alfred Marshall