World most Richest city.

The most populor metropolitan area in the world. Tokyo comes in rank in top 10 richest cities in the world 2016 because Tokyo has so strong gross domestic product of $1,520 billion which is enough to keep its first rank all around the world in comparison  of wealthiest cities.  However, Japanese have proved that they can make everything as made the Tokyo well-established land and now it has prominent importance and value all over the world. The most populous area in the world has population of more than 13 million