Mexico City I
Mexico City abbreviated as CDMX, is the capital and most populous city of Mexico. Is one of the most important financial centers in the Americas. It is located in the Valley of Mexico, a large valley in the high plateaus at the center of Mexico, at an altitude of 2,240 metres (7,350 ft).
Greater Mexico City has a GDP of $411 billion in 2011, making Mexico City urban agglomeration one of the largest metropolitan areas in the world. The city was responsible for generating 15.8% of Mexico's GDP and the metropolitan area accounted for about 22% of total national GDP. As a stand-alone country, in 2013, Mexico City would be the fifth-largest economy in Latin America—five times as large as Costa Rica and about the same size as Peru. [Wiki]