Tokyo is the capital of Japan, the center of the Greater Tokyo Area, and the most populous metropolitan area in the world. In 2013, Tokyo was named the third most expensive city for expatriates, according to the Mercer consulting firm, and the world's most expensive city, according to the Economist Intelligence Unit's cost-of-living survey. In 2009 Tokyo was named the third Most Liveable City and the World’s Most Livable Megalopolis by the magazine Monocle.