When it comes to exchanging one currency for another, there are several different approaches a country may adopt. The United States uses:

		a fixed exchange rate system where exchange rates are held constant.
		a pegged exchange rate system where the dollar is pegged to the Euro.
		a managed float exchange rate system where the U.S government directly intervenes if the exchange rate against other currencies gets too high or too low.
		a free-floating exchange rate system where the U.S. government does not directly intervene to alter exchange rates.