History of money
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The history of money is the development over time of systems for the exchange of goods and services. Money is a means of fulfilling these functions indirectly and in general rather than directly, as with barter.
Money may take a physical form as in coins and notes, or may exist as a written or electronic account. It may have intrinsic value (commodity money), be legally exchangeable for something with intrinsic value (representative money), or have only nominal value (fiat money).