Final answer:
The European Union (EU) has a collective economy that is larger than that of the United States and almost three times larger than Japan's economy, becoming a significant economic power globally.
Step-by-step explanation:
The entity that has a collective economy that is larger than the United States and almost three times larger than Japan is the European Union (EU). The EU is a political and economic union consisting of 27 member countries that are located primarily in Europe. It has an integrated economy with policies designed to ensure the free movement of people, goods, services, and capital within the internal market.
With a sizable population and high-income economies such as Germany, France, and Italy, the EU collectively represents a significant economic power on the global stage. The EU's economy surpasses that of the United States when considered as a single entity, largely due to its extensive market and the aggregate economic activities of its member countries.