Long before the EURO there seems to have been a common European currency some 4000 years ago, when people used rings, bangles, and axe blades as currency. Researchers examined objects from 2150-1700 BC and found that, for instance, 70 percent of rings had a weight that could not be perceptibly distinguished from a ring of 195.5 grams. This is explained that such objects were made to be perceptibly indistinguishable and served as a kind of currency.
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