In the international foreign cashback forex market, although there are many types of currencies that can be bought and sold, but the trading volume between the seven major currencies led by the forexcashbackprofitcalculator. cashbackforexpipcalculator. cashback forex profit calculator accounts for 80% of the total trading volume, but also we are engaged in foreign exchange investment trading the main currency A. The U.S. dollar cashbackforexprofitcalculator the center of the market 1, why the U.S. dollar is the most important transaction in the foreign exchange market Currency?　　Daily transactions involving the U.S. dollar account for more than 80% of global foreign exchange transactions, which clearly indicates that the U.S. dollar is the main trading currency in the foreign exchange market The fundamental reason is the main position of the U.S. economy in the world, the strong economic strength of the United States and a wide range of global trade, trade core position determines: 1), most countries central bank foreign exchange reserves are the main body of the U.S. dollar, although in recent years the major Central banks claim to reduce the proportion of the U.S. dollar in foreign exchange reserves, increasing the euro reserves or gold reserves, but there is no doubt: the U.S. dollar is still the main foreign exchange reserves of the vast majority of countries in the world 2), the worlds major commodities are denominated in U.S. dollars, such as gold, oil, etc. 3), most international trade is still the U.S. dollar as the settlement currency 4), the vast majority of international debt is also denominated in U.S. dollars 5 5), almost every countrys currency is quoted with the dollar as the basic exchange rate, other exchange rates through conversion 6), the history of the main exchange rate system changes are led by the United States, such as the Second World War Bretton Woods system, the Bretton Woods system collapsed in 1973 with the floating exchange rate system, are due to changes in the dollar 2, the dollar index movement characteristics　　It is an indicator that reflects the exchange rate of the U.S. dollar in the foreign exchange market, and is used to measure the degree of change in the exchange rate of the U.S. dollar against a basket of currencies. It measures the strength of the U.S. dollar by calculating the combined rate of change of the U.S. dollar and against a selected basket of currencies, thus indirectly reflecting the competitiveness of U.S. exports and changes in the cost of imports If the dollar index falls, it means that the dollar depreciates against other major currencies Dollar index futures The calculation is based on the trade settlement volume between each major country and the U.S., and the overall strength of the U.S. dollar is calculated in a weighted manner The U.S. dollar index is obtained by weighting the exchange rates of six major currencies: the euro, the Japanese yen, the British pound, the Canadian dollar, the Swedish krona and the Swiss franc, with index weights of 57.6%, 13.6%, 11.9%, 9.1%, 4.2% and 3.6% respectively The graphical run of the U.S. dollar index Characteristics and the largest weight of the euro trend almost exactly opposite, the fluctuations of the euro on the dollar trend is also very influential euro up dollar down, euro down dollar up since the introduction of the euro has not been broken law need to note is: the Australian dollar is not in the dollar index weight, that is, no matter how much the Australian dollar up or down, will not affect the trend of the dollar index II, the yen, European currencies, the commodity currencies constitute 6 basic points. Commodity currency composition of the 6 basic points