Money is historically an emergent market phenomenon establishing a commodity money, but nearly all contemporary money systems are based on fiat money.[4] Fiat money, like any check or note of debt, is without intrinsic use value as a physical commodity. It derives its value by being declared by a government to be legal tender; that is, it must be accepted as a form of payment within the boundaries of the country, for "all debts, public and private".[6] Such laws in practice cause fiat money to acquire the value of any of the goods and services that it may be traded for within the nation that issues it.