| http://www.w3.org/ns/prov#value | - But it will perhaps be argued that the custom of mankind is to measure the value of commodities generally by the value of coin???and that it was the intention of the constitution that coin should be, in practice, a ???standard of value.??? But this custom is by no means universally observed, for different kinds of property are continually exchanged, or bought and sold with and for each other, with
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