Currency relative values of the different currencies. Currencies in this sense are defined by governments, and each type has limited boundaries of acceptance. Other definitions of the term "currency" are discussed in their respective synonymous articles banknote, coin, and money. The latter definition, pertaining to the currency systems of nations, is the topic of this article. Currencies can be classified into two monetary systems: fiat money and commodity money, depending on what guarantees the value (the economy at large vs. the government's physical metal reserves). Some currencies are legal tender in certain political jurisdictions. Others are simply traded for their economic
Velocity of money assumed that, other things being equal, prices must change in proportion to the changes occurring in the total supply of money available. This is not true." Velocity of money The term "velocity of money" (also "The velocity of circulation of money") refers to how fast money passes from one holder to the next. It can refer to the income velocity of money, which is the frequency at which the average same unit of currency is used to purchase newly domestically-produced goods and services within a given time period. In other words, it is the number of times one unit of