Dollar (UnitedStatesdollar abbreviation: USD；; ISO42 17 currency code: USD; ; Symbol: USD) is the legal tender of the United States, El Salvador, Panama, Ecuador, East Timor, Marshall Islands, Kiribati and Palau. Dollar banknotes in circulation are all versions of banknotes issued since 1929.

1792 appeared after the passage of the American mint act. At present, the issuance of US dollars is controlled by the Federal Reserve system. Starting from 19 13, the United States established the federal reserve system and issued federal reserve bonds. More than 99% of the banknotes in circulation are federal reserve notes.

The competent department for issuing US dollars is Congress, and the Federal Reserve Bank is responsible for the specific issuance business. After World War II, continental European countries reached an agreement with the United States to use US dollars for international payments. Since then, the dollar has been widely used as a reserve currency in countries outside the United States, and eventually became an international currency.

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Dollar index: Usually, the tool we use to analyze the trend of the dollar is the dollar index, which is an index that comprehensively reflects the exchange rate of the dollar in the international foreign exchange market and is used to measure the degree of exchange rate change of the dollar against a basket of currencies.

It measures the strength of the US dollar by calculating the comprehensive rate of change between the US dollar and a selected basket of currencies, thus indirectly reflecting the changes in US export competitiveness and import costs. If the dollar index falls, it means that the dollar depreciates against other major currencies.

The calculation principle of dollar index futures is based on the trade settlement between major countries in the world and the United States, with 100 as the dividing line, and the overall strength of the dollar is calculated in a weighted way. After the launch of 1999 65438+ 10/Euro, the subject matter of the futures contract was adjusted from ten countries to six countries, and the euro became the most important and weighted currency, accounting for 57.6%. Therefore, the fluctuation of the euro has the greatest influence on the strength of the US dollar index.