| http://www.w3.org/ns/prov#value | - It is why there were only two global price standards, gold and the dollar, over a three hundred year period; that there was no period, except in the chaos of the 1930 and World War II, when there was a mix of dominant currencies; and that the transition between the gold standard and the dollar standard did not take place gradually but abruptly and in a short period.
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