Most countries do not peg their currencies to the dollar exchange rate and adhere to a floating exchange rate policy. In such cases, the main factor in the price of the currency - trading on the currency exchange in the dollar against the national currency on the currency exchange. Usually, there is support for the exchange rate against the dollar, but still the lion s share of the dynamics of the dollar exchange rate falls on market relations, trading, conditions such as the interest rate, imports / exports, internal and external debt of the country, as well as economic positions.