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Currency

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Foreign exchange
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A currency is a unit of exchange, facilitating the transfer of goods and services. It is a form of money, where money is defined as a medium of exchange (rather than e.g. a store of value). A currency zone is a country or region in which a specific currency is the dominant medium of exchange. To facilitate trade between currency zones, there are exchange rates i.e. prices at which currencies (and the goods and services of individual currency zones) can be exchanged against each other. Currencies can be classified as either floating currencies or fixed currencies based on their exchange rate regime. In common usage, currency sometimes refers to only paper money, as in "coins and currency", but this is incorrect. Coins and paper money are both forms of currency.

In most cases, each country has monopoly control over its own currency. Member countries of the European Monetary Union are a notable exception to this rule, as they have ceded control of monetary policy to the European Central Bank.

In cases where a country does have control of its own currency, that control is exercised either by a Central Bank or by a Ministry of Finance. In either case, the institution that has control of monetary policy is referred to as the monetary authority. Monetary authorities have varying degrees of autonomy from the governments that create them. In the United States, the Federal Reserve operates with full independence from the government. It is important to note that a monetary authority is created and supported by its sponsoring government, so independence can be reduced or revoked by the legislative or executive authority that creates it. In almost all Western countries, the monetary authority is largely independent from the government.

Several countries can use the same name, each for their own currency (e.g. Canadian dollars and US dollars), several countries can use the same currency (e.g. the euro), or a country can declare the currency of another country to be legal tender. For example, Panama and El Salvador have declared US currency to be legal tender, and from 1791-1857, Spanish silver coins were legal tender in the United States. At various times countries have either restamped foreign coins, or used currency board issuing one note of currency for each note of a foreign government held, as Ecuador currently does.

Each currency typically has one fractional currency, often valued at 1/100 of the main currency: 100 cents = 1 dollar, 100 centimes = 1 franc, 100 pence = 1 pound. Units of 1/10 or 1/1000 are also common, but some currencies do not have any smaller units. Mauritania and Madagascar are the only remaining countries that do not use the decimal system; instead, the Mauritanian ouguiya is divided into 5 khoum, while the Malagasy ariary is divided into 5 iraimbilanja. However, due to inflation, both fractional units have in practice fallen into disuse.

See Non-decimal currencies for other (mostly historic) currencies with non-decimal divisions.



Privately-issued currencies

See also: Private currency

From the earliest times token coins were issued by companies in remote parts of the world to overcome the shortage of circulating currency.

Several large companies issue points to their customers, to be redeemed for products and services produced by that company. Often, a network of companies will join to share in the offering and redemption of points. While these can hardly be considered stable currency systems, they present many of the same features as "legitimate" currency: they are a store of value, issued in discrete units; they are controlled by a central issuing authority; and they have varying rates of exchange with other forms of currency. For example, frequent flyer miles can be bought using U.S. dollars.

  • Frequent flyer miles: A type of private currency, different versions of which are issued by most major airlines to encourage customer loyalty. Other customer loyalty incentives have followed this model, including points systems offered by soft drink manufacturers such as PepsiCo. Subway tokens, issued by city transit authorities, can be considered a highly specialized form of currency.
  • Scrip: A type of private currency where a certain value is captured, and used to purchase goods from a company. Examples of scrip include gift certificates, gift cards, and Disney Dollars or Canadian Tire Money. However, scrip is not considered a currency in itself, but merely a store of value, denominated in another currency.


World currency

With such developments as the Euro allowing for facilitated trade and perhaps a corresponding increase in a wider identity, proposals for a global currency have accelerated, even while it is recognized that several political and economic factors would need to be addressed and intermediate steps taken before such a concept might be accepted by the diverse nations of the world.

Circulating currencies

See List of currencies for a list of all current and historical currencies. See List of historical currencies or historical currencies below for historical currencies. See List of circulating currencies for a list of currencies by country. The following is a list of currency names (denominations) of the world in alphabetic order by currency name:

A-E

F-M

N-R

S-Z

Historical currencies

See also List of historical currencies.

Ancient Greece

Ancient Rome

Africa

America

Asia

Australasia

Europe

Accounting units

Proposed Currencies

Lists

See also

Records

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