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The price to exchange one U.S. dollar for one unit of a foreign currency is called an exchange rate. The exchange rate of the U.S. dollar varies for different foreign currencies, which fluctuate daily based on a number of factors.
Kamada and Takagawa (2005) estimate the exchange-rate effects for the growth rate of multilateral, aggregate imports in real terms in terms of the growth rates of real GDP, of the real exchange rate, and of future exports; the estimation period is from 1994 to 2000.