Currency has been many things over the ages. First, it was barley, salt and cattle. It then became metal, mostly gold and silver. Representational currency came next, where pieces of paper represented holdings in gold or silver. Then fiat became the norm, where the currency's value was supported only by the government issuing it. Crypto-currencies have now entered the scene and are believed by many to be setting the stage for the next shift in currency. The question remains: What will it take to drive adoption and allow digital currencies to replace fiat as the major form of currency on the planet?
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