Dollar Index.
In plain English
The dollar index, often called the DXY, tracks the US dollar's strength against a weighted basket of major currencies like the euro, yen, and pound. When the index rises, the dollar is buying more foreign currency; when it falls, the dollar is weaker. A strong dollar makes imports and foreign travel cheaper for Americans but makes US exports pricier abroad. Investors watch it because a rising dollar can pressure commodities, foreign stocks, and the earnings of big US companies that sell overseas.
01Why it matters
The dollar's strength quietly shapes the price of imports, the value of overseas investments, and the competitiveness of US exports, so the index is a useful economic gauge.
02The math, step by step
The dollar index climbs 5 percent over a few months. Your European vacation gets cheaper, but a US company that earns half its sales abroad sees those sales worth less in dollars.
03What this is NOT
The dollar index is NOT about what a dollar buys at the US store. It measures the dollar against other currencies, not against domestic prices, which is what inflation tracks.