| http://www.w3.org/ns/prov#value | - As the [products] of nature were not all easily portable, people agreed for purposes of barter mutually to give and receive some article, which, while it was itself a commodity, was practically easy to handle in the business of life, some such article as iron or silver, which was at first defined simply by size and weight; although finally they went further and set a stamp upon every coin to relie
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