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Yuan dynasty banknotes are the earliest known fiat money. Fiat money is a currency established as money by government regulation or law. The term derives from the Latin fiat (let it become, it will become) used in the sense of an order or decree. It differs from commodity money and representative money.
A reserve currency is a currency that is held in significant amounts by governments and institutions in order to help conduct transactions in the global market. The major reserve currency of the planet right now is the US Dollar, which composes upwards of 60% of all forex reserves.The Euro has grown in prominence over the past decade as a reserve currency, and now makes up nearly 30% of all forex reserves through the world.ommodities such as oil and gold are usually priced in a certain type of currency (US Dollars), meaning that governments need to have large pools of US Dollars (or Euros) in their foreign exchange reserves in order to engage in the buying and selling of these commodities.