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Currency Substitution occurs when the inhabitants of a country use a foreign currency in parallel to or instead of the domestic currency. .

Currency substitution can be full or partial. Full currency substitution has taken place in small countries, mostly in Latin America, the Caribbean and the Pacific which are heavily dependent on the United States. Partial currency substitution occurs when residents of a country choose to hold a significant share of their financial assets denominated in foreign currency

The major currencies used as substitutes are the United States dollar, the Euro, the New Zealand dollar, the Swiss franc, the Indian rupee, the Australian dollar Armenian dram, Turkish lira, the Israeli shekel, and the Russian ruble

Origins
After the gold standard was abandoned at the outbreak of World War I and the Bretton Woods Conference following World War II, some countries were desperately seeking exchange rate regimes to promote global economic stability and hence their own prosperity. Countries usually peg their currency to a major convertible currency. "Hard pegs" are extreme exchange rate regimes that demonstrate a stronger commitment to a fixed parity (i.e. currency boards) or relinquish control over their own currency (such as currency unions) while "soft pegs" are more flexible and floating exchange rate regimes. The collapse of "soft" pegs in Southeast Asia and Latin America in the late 1990s led to currency substitution to become a serious policy issue.

A few cases of full currency substitution prior to 1999 had been the consequence of political and historical factors. In all long-standing currency substitution cases, historical and political reasons have been more influential than an evaluation of the economic effects of currency substitution. Panama adopted the U.S. dollar as legal tender after independence as the result of a constitutional ruling. Ecuador and El Salvador became fully dollarized economies in 2000 and 2001 respectively with different influential factors. Ecuador underwent the process of currency substitution to deal with a widespread political and financial crisis resulting from massive loss of credibility in its political and monetary institutions. By contrast, El Salvador's official currency substitution was a result of internal debates and in a context of stable macroeconomic fundamentals and long-standing unofficial currency substitution. The euro area adopted the euro (€) as its common currency and sole legal tender in 1999, which might be considered a variety of full-commitment regime similar to full currency substitution despite some evident differences from other currency substitutions.

Measures
There are two common indicators of currency substitution. The first one is the share of foreign currency deposits (FCD) in the domestic banking system in the broad money including of FCD. The second measure is the share of all foreign currency deposits held by domestic residents at home and abroad in their total monetary assets.

Types
Unofficial currency substitution or de facto currency substitution is the most popular type of currency substitution. Unofficial currency substitution happens when residents of a country choose to hold a significant share of their financial assets denominated in foreign currency although the foreign currency lacks the legal tender. They hold deposits in the foreign currency because of a bad track record of the local currency, or as a hedge against inflation of the domestic currency.

Official currency substitution or full currency substitution happens when a country adopts a foreign currency as its sole legal tender, and ceases to issue the domestic currency. Another effect of a country adopting a foreign currency as its own is that the country gives up all power to vary its exchange rate. There is a small number of countries adopting a foreign currency as legal tender. For example, Panama underwent a process of full currency substitution by adopting the U.S. dollar as legal tender in 1904. This type of currency substitution is also known as de jure currency substitution.

Currency substitution can be used semiofficially (or officially bimonetary systems), where the foreign currency is legal tender alongside the domestic currency.

In literature, there is a set of related definitions of currency substitution such as external liability currency substitution, domestic liability currency substitution, banking sector's liability currency substitution or namely deposit currency substitution and credit dollarlization. The external liability currency substitution measures total external debt (private and public) denominated in foreign currencies of the economy. Deposit currency substitution can be measured as the share of foreign currency deposits in total deposit of the banking system while credit currency substitution can be measured as the share of dollar credit in total credit of the banking system.

On trade and investment
One of the main advantages of adopting of a strong foreign currency as sole legal tender is to reduce the transaction costs of trade among countries using the same currency. There are at least two ways to infer this impact from data. The first one is a significantly negative effect of exchange rate volatility on trade in most cases, and the second is an association between transaction costs and the need to operate with multiple currencies. Economic integration with the rest of the world becomes easier as a result of lowered transaction costs and stabler prices. Rose (2000) applied the gravity model of trade and provided empirical evidence that countries sharing a common currency engage in significantly increased trade among them, and that the benefits of currency substitution for trade may be large.

Countries with full currency substitution economies can invoke greater confidence among international investors, inducing increased investments and growth. The elimination of the currency crisis risk due to full currency substitution leads to a reduction of country risk premiums and then to lower interest rates. These effects result in a higher level of investment. However, there is a positive association between currency substitution and interest rates in a dual-currency economy.

On monetary and exchange rate policies
Official currency substitution helps to promote fiscal and monetary discipline and thus greater macroeconomic stability and lower inflation rates, to lower real exchange rate volatility, and possibly to deepen the financial system. Firstly, currency substitution helps developing countries, providing a firm commitment to stable monetary and exchange rate policies by forcing a passive monetary policy. Adopting a strong foreign currency as legal tender will help to "eliminate the inflation-bias problem of discretionary monetary policy". Secondly, official currency substitution imposes stronger financial constraint on the government by eliminating deficit financing by issuing money. An empirical finding suggests that inflation has been significantly lower in economies with full currency substitution than nations with domestic currencies. The expected benefit of currency substitution is the elimination of the risk of exchange rate fluctuations and a possible reduction in the country's international exposure. Though currency substitution cannot eliminate the risk of an external crisis, it provides steadier markets as a result of eliminating fluctuations in exchange rates.

On the other hand, currency substitution leads to the loss of seigniorage revenue, the loss of monetary policy autonomy, and the loss of the exchange rate instruments. Seigniorage revenues are the profits generated when monetary authorities issue currency. When adopting a foreign currency as legal tender, a monetary authority needs to withdraw the domestic currency and give up future seigniorage revenue. The country loses the rights to its autonomous monetary and exchange rate policies, even in times of financial emergency; former chairman of the Federal Reserve Alan Greenspan, for example, has stated that the central bank only considers the effects of its decisions on the US economy. In a full currency substituted economy, exchange rates are indeterminate and monetary authorities cannot devalue the currency. In an economy with high currency substitution, devaluation policy is less effective in changing the real exchange rate because of significant pass-through effects to domestic prices. However, the cost of losing an independent monetary policy exists when domestic monetary authorities can commit an effective counter-cyclical monetary policy, stabilizing the business cycle. This cost depends adversely on the correlation between the business cycle of the client country (the economy with currency substitution) and the business cycle of the anchor country. In addition, monetary authorities in economies with currency substitution diminish the liquidity assurance to their banking system.

On banking systems
In an economy with full currency substitution, monetary authorities cannot act as lender of last resort to commercial banks by printing money. The alternatives to lending to the bank system may include taxation and issuing government debt. The loss of the lender of last resort is considered a cost of full currency substitution. This cost depends on the initial level of unofficial currency substitution before moving to a full currency substituted economy. This relation is negative because in a heavily currency substituted economy, the central bank already fears difficulties in providing liquidity assurance to the banking system. However, literature points out the existence of alternative mechanisms to provide liquidity insurance to banks, such as a scheme by which the international financial community charges an insurance fee in exchange for a commitment to lend to a domestic bank.

Commercial banks in countries where saving accounts and loans in foreign currency are allowed may face two types of risks: However, currency substitution eliminates the probability of a currency crisis that impacts negatively on the banking system through the balance sheet channel. Currency substitution may reduce the possibility of systematic liquidity shortages and the optimal reserves in the banking system. Research has shown that official currency substitution has played a significant role in improving bank liquidity and asset quality in Ecuador and El Salvador.
 * 1) Currency mismatch risk: Assets and liabilities on the balance sheets may be in different denominations. This may arise if the bank converts foreign currency deposits into local currency and lends in local currency, or vice versa.
 * 2) Default risk: Arises if the bank uses the foreign currency deposits to lend in foreign currency.

The dynamics of the flight from domestic money
High and unanticipated inflation rates decrease the demand for domestic money and raise the demand for alternative assets, including foreign currency and assets dominated by foreign currency. This phenomenon is called the "flight from domestic money". It results in a rapid and sizable process of currency substitution. In countries with high inflation rates, the domestic currency tends to be gradually displaced by a stable currency. At the beginning of this process, the store-of-value function of the domestic currency is replaced by the foreign currency. Then, the unit-of-account function of the domestic currency is displaced when many prices are quoted in a foreign currency. A prolonged period of high inflation will induce the domestic currency to lose its function as medium of exchange when the public carries out many transactions in foreign currency.

Ize and Levy-Yeyati (1998) examine the determinants of deposit and credit currency substitution, concluding that currency substitution is driven by the volatility of inflation and the real exchange rate. Currency substitution increases with inflation volatility and decreases with the volatility of the real exchange rate.

Institutional factors
The flight from domestic money depends on a country's institutional factors. The first factor is the level of development of the domestic financial market. An economy with a well-developed financial market can offer a set of alternative financial instruments dominated in domestic currency, reducing the role of foreign currency as an inflation hedge. The pattern of the currency substitution process also varies across countries with different foreign exchange and capital controls. In a country with strict foreign exchange regulations, the demand for foreign currency will be satisfied in the holding of foreign currency assets abroad and outside the domestic banking system. This demand often puts pressure on the parallel market of foreign currency and on the country's international reserves. Evidence for this pattern is given in the absence of currency substitution during the pre-reform period in most transition economies, because of constricted controls on foreign exchange and the banking system. In contrary, by facilitating the domestic holding of foreign currency, a country might mitigate the shift of assets abroad and strengthen its external reserves in exchange for a currency substitution process. However, the effect of this regulation on the pattern of currency substitution depends on the public's expectations of macroeconomic stability and the sustainability of the foreign exchange regime.

Countries using the U.S. dollar exclusively

 * British Virgin Islands
 * Caribbean Netherlands (from 1 January 2011)
 * East Timor (uses its own coins)
 * Ecuador (uses its own coins in addition to U.S. coins; Ecuador adopted the U.S. dollar as its legal tender in 2000.)
 * El Salvador
 * Marshall Islands
 * Federated States of Micronesia (Micronesia used the U.S. dollar since 1944)
 * Palau (Palau adopted the U.S. dollar since 1944)
 * Panama (uses its own coins in addition to U.S. coins. This country has adopted the U.S. dollar as legal tender since 1904.)
 * Turks and Caicos Islands

Countries using the U.S. dollar alongside other currencies

 * Bahamas
 * Barbados (Barbadian dollar pegged at 2/1 but USD is accepted)
 * Costa Rica
 * Belize (Belizean Dollar pegged 2/1 but USD is accepted)
 * Bermuda
 * Uruguay
 * Iraq
 * Cambodia (uses Cambodian Riel for many official transactions but most businesses deal exclusively in dollars for all but the cheapest items. Change is often given in a combination of US dollars and Cambodian Riel. ATMs yield US dollars rather than Cambodian Riel.)
 * Lebanon (along with the Lebanese pound)
 * Liberia (was fully dollarized until 1982, when the National Bank of Liberia began issuing five dollar coins; U.S. dollar still in common usage alongside the Liberian dollar)
 * Zimbabwe
 * Haiti (uses the U.S Dollar alongside its domestic currency, the Gourde)
 * Vietnam (along with the Vietnamese Dong)
 * Somalia (along with the Somali Shilling)
 * North Korea (along with the Chinese yuan, Euro, and North Korean Won)

Euro

 * Andorra (formerly French franc and Spanish peseta since 1278 )
 * Kosovo (formerly German mark and Yugoslav dinar)
 * Monaco (formerly French franc since 1865; issues its own euro coins)
 * Montenegro (formerly German mark and Yugoslav dinar)
 * San Marino (formerly Italian lira; issues its own euro coins)
 * Vatican City (formerly Italian lira; issues its own euro coins)
 * Zimbabwe (Alongside USD, South African Rand and Botswana pula)
 * North Korea (along with the Chinese yuan, USD, and North Korean Won)

New Zealand dollar

 * Cook Islands (issues its own coins and some notes)
 * Nauru (alongside Australian dollar from 25 May 2013)
 * Niue
 * Pitcairn Island
 * Tokelau

Australian dollar

 * Kiribati (issues its own coins; Kiribati has used Australian currency since 1943 )
 * Nauru (has fully used Australian currency since 1914 )
 * Tuvalu (issues its own coins; Tuvalu has used Australian currency alongside its domestic currency since 1892 )

South African rand

 * Lesotho
 * Namibia (Alongside Namibian dollar)
 * Swaziland (Alongside Swazi Lilangeni and American Dollar)
 * Zimbabwe (Alongside the American dollar, Euro and Botswana pula)

Others

 * Armenian dram: Nagorno-Karabakh Republic
 * Russian ruble: Abkhazia and South Ossetia (de facto independent states, but recognized as part of Georgia by nearly all other states)
 * Indian rupee:
 * Bhutan (Alongside Bhutanese Ngultrum, pegged at par with the rupee)
 * Nepal (Alongside the Nepali Rupee, pegged at ₹0.625)
 * Swiss franc: Liechtenstein
 * Israeli shekel: Palestinian territories
 * Jordanian Dinar: West Bank (Alongside Israeli New Sheqel)
 * Egyptian Pound: Gaza Strip (Alongside Israeli New Sheqel)
 * Turkish lira: Turkish Republic of Northern Cyprus (de facto independent state, but recognized as part of Cyprus by all states but Turkey)
 * Canadian Dollar: St Pierre and Miquelon (Alongside Euro)