A fixed exchange rate, sometimes called a pegged exchange rate, is a type of exchange rate regime in which a currency's value is fixed or pegged by a monetary authority against the value of another currency, a basket of other currencies, or another measure of value, such as gold. There are benefits and risks to using a fixed exchange rate system. A fixed exchange rate is when a country ties the value of its currency to some other widely-used commodity or currency. The dollar is used for most transactions in international trade. Today, most fixed exchange rates are pegged to the U.S. dollar. Countries also fix their currencies to that of their most frequent trading partners. Under the system of fixed pars, as adopted by the IMF member nations, the exchange rate is determined by the government and enforced either by pegging operation, or by resorting to some form of exchange control and sometimes by a healthy combination of both these methods.