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A Brief introduction to the United States dollar index: The United States dollar index is simply an index or measure of the value of the US dollar relative to a basket of foreign currencies, and these currencies hold different wings. It reflects the dollar performance against the basket of currencies. After the abolition of gold standards in the foreign exchange markets dollar floats freely in the market for value evaluation of goods. The base value of the greenback index began at 100, and it tracks the contrasting six foreign currencies for their exchange rates.