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
Economics terminology that differs from common usage be included. Common measures include M1, M2, and M3. In everyday usage, "money" can refer to the very liquid assets included in the technical definition, but it usually refers to something much broader. When someone says "She has a lot of money," the intended meaning is almost certainly that she has a lot of what economists would call financial wealth, which includes not only the most liquid assets (which tend to pay low or zero returns), but also stocks, bonds and other financial investments not included in the technical definition. Non-financial assets, such as land and buildings, may also be