| http://www.w3.org/ns/prov#value | - If you are to measure value, you must measure it by the agency of some one commodity or other possessed of value, and not as Mr Malthus proposes by referring to the agent employed to give value; and as the circumstances under which every commodity is produced must always be liable to vary none can be an invariable measure, though some are certainly much less variable than others and may, therefore
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