1. Dollar is a dollar bill that is controlled to circulate in the United States. Since 1929, the competent authority for the sales of all versions of banknotes is the Congress, and the actual sales business process is applied by the Federal Reserve Bank. After World War II, China and the United States in continental Europe reached an agreement to allow the use of US dollars for international payments. Since then, the US dollar has been widely used as a reserve currency in China outside the United States, and eventually became an international currency.
2. The Federal Reserve Bank of the United States is responsible for issuing American currency, and its currency symbol is "$". Dollars include dollar bills and coins. At present, there are seven denominations in circulation, such as 100, 50, 20, 10, 5, 2 and 1. Coin denominations include 1 USD and 50 cents, 25 cents, 10 cents, 5 cents and 1 cent. Due to its great influence in the world, after World War II, the US dollar was widely used as a reserve currency by countries outside the United States and eventually became an international currency. The US dollar has a great influence on the money market and even the international gold market, so many countries use the US dollar as the main trading currency.
3. The dollar index is unexpected. The dollar index is not from CBOT or CME, but from new york Cotton Exchange (NYCE). The cotton trade in new york was originally composed of a group of cotton merchants and middlemen. At present, it is the oldest commodity exchange in new york and the most important cotton futures and options exchange in the world. New york Cotton Exchange set up a financial department and formally entered the global financial commodity market. It first introduced dollar index futures. The calculation principle of dollar index futures is based on the trade volume 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.