First, to calculate the exchange rates of different states, you need to know the purchasing power of currencies of each and compare prices on the world markets - the average level of prices for goods and services from different countries expressed in national currency. Also take into account supply and demand (depending on the number of participants in the exchange) for a particular currency. It formed the concept of "exchange rate" - the cost of the currency of one state, expressed in the currency of another state. Thus, exporters and importers of goods or services, manufacturers and buyers have an equal chance to make a so-called technical analysis of forex market - compare prices of the state with the prices of those same goods and services of another state and to assess the degree of favorable development (investment) of any business in this country. It would not change the value of goods or services within a single state, the payment ability money of any state is able to subdue the exchange rate, and to reveal their real value in relation to the world market. Thus, the exchange rate is able to determine the absolute value of a business (manufacturing or services) on the basis of world prices, domestic prices resulting from the comparison. Currency exchange rates - it is an objective comparison of prices among states, the main suppliers of the same business (goods or services), the global market. Nevertheless, the exchange rate affect a number of several other factors: this is inflation, which cause the falling value of domestic money to the currencies of other countries: those states where the rate of inflation lower. That the balance of payments of any state. Either way, all countries participate in international operations to exchange (import or export) of goods and services, in simple words - capital. Balance of payments is value terms the ratio of import to export (or vice versa) of capital. Surplus increases demand for the currency of this state, the passive is - on the contrary, decreases, thereby reducing and course of the national currency. Unstable balance of payments is most often caused by the movement of short-term capital (any speculative currency transactions). Also the exchange rate may fluctuate with changes in interest rates of different countries: it is clear that rising interest rates provides the inflow of foreign capital, and lowering stimulates the flow of capital abroad (including the national currency). All this is most characteristic of short-term investments - speculative operations with currency. All investors are currency speculators, as always monitor and forecast the movement of currency exchange: it is important to know in advance which of the courses in the near future will have a downward trend in time to sell (exchange), the currency more stable. Currency market forex, as well as all the participants reacted quite sensitively and quickly to any news forex market: changes and fluctuations in exchange rates, thereby providing liquidity to the forex market. Political or economic events in any country always have an influence on the stability of national currency, and entail currency fluctuations on the world market of forex. Hence the understandable desire and willingness of investors, and all market participants to know and foresee certain events in the country: the exchange rate depends largely on the trust or distrust of the people in their government, from election re-election, resigning ministers, presidents and leaders of various economic States. Someone wisely point: "knowledgeable, is forearmed." Therefore, participants in the FX market is important first to get financial news, to make the calendar of economic events, to anticipate and predict the movement of the course. To interest and attract attention of traders, many forex brokers are interested in working with experienced analysts, predictive FX market.