Which country has the largest economy in the world?

The United States has the largest economy in the world when measured by nominal gross domestic product. Recent estimates place U.S. GDP at well over 25 trillion U.S. dollars, ahead of China and other major economies. Nominal GDP compares economies using market exchange rates, making it the most common global ranking. The U.S. economy is supported by a large consumer market, advanced industries, finance, technology, and services. Different measures, such as purchasing power parity, can change the order, but by nominal GDP the United States remains first.