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Before the invention of money, people relied on a system of bartering, directly exchanging goods and services. However, system often inefficient it required a mutual coincidence wants between traders. To solve , societies began commodity money, objects with value like salt or served as a of exchange. The development of metal coins with a standardized weight and value was a major advancement in commerce. Today, currency has evolved into paper banknotes and digital forms, but its fundamental purpose remains the same.