 A popular and widely used composite currency is the SDR, which is a composite currency created by the International Monetary Fund (IMF), consisting of a fixed quantity of U.S. dollars, Chinese yuan, euros, Japanese yen, and British pounds.In a crawling peg system a country fixes its exchange rate to another currency or basket of currencies.This fixed rate is changed from time to time at periodic intervals with a view to eliminating exchange rate volatility to some extent without imposing the constraint of a fixed rate.