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The debate of choosing between fixed and floating exchange rate methods is formalized by the Mundell–Fleming model, which argues that an economy (or the government) cannot simultaneously maintain a fixed exchange rate, free capital movement, and an independent monetary policy. It must choose any two for control and leave the other to market ...
The market convention is to quote most exchange rates against the USD with the US dollar as the base currency (e.g. USDJPY, USDCAD, USDCHF). The exceptions are the British pound (GBP), Australian dollar (AUD), the New Zealand dollar (NZD) and the euro (EUR) where the USD is the counter currency (e.g. GBPUSD, AUDUSD, NZDUSD, EURUSD).
The international dollar (int'l dollar or intl dollar, symbols Int'l$., Intl$., Int$), also known as Geary–Khamis dollar (symbols G–K$ or GK$), is a hypothetical unit of currency that has the same purchasing power parity that the U.S. dollar had in the United States at a given point in time.
For a more exhaustive discussion of countries using the U.S. dollar as official or customary currency, or using currencies which are pegged to the U.S. dollar, see International use of the U.S. dollar#Dollarization and fixed exchange rates and Currency substitution#US dollar. Countries using the U.S. dollar as their official currency include:
A currency [a] is a standardization of money in any form, in use or circulation as a medium of exchange, for example banknotes and coins. [1] [2] A more general definition is that a currency is a system of money in common use within a specific environment over time, especially for people in a nation state. [3]
In 2018, the lira's exchange rate deteriorated rapidly, reaching ₺4.5 per US dollar by mid-May and ₺4.9 a week later. Economists generally attributed the accelerating loss of value to Recep Tayyip Erdoğan preventing the Central Bank of the Republic of Turkey from making necessary interest rate adjustments.
In 1932, the rial was pegged to sterling at a rate of £1 = Rls 59.75. The exchange rate was £1 = Rls 80.25 in 1936, £1 = Rls 64.350 in 1939, £1 = Rls 68.8 in 1940, £1 = Rls 141 in 1941 and £1 = Rls 129 in 1942. In 1945, the rial was pegged to the U.S. dollar at USD 1 = Rls 32.25. The rate was US$1 = Rls 75.75 in 1957.