Migration to cities is a long-standing trend that continues to this day, especially in developing countries. Currently, according to the World Bank, 56% of the world’s population lives in cities, and the Bank projects that this trend will continue: by 2050, seven out of every ten people will live in cities.

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Tokyo. The metropolitan area of the Japanese capital has a population of 37.4 million, making it by a wide margin the most populous city in the world. It is followed by Jakarta, the capital of Indonesia, and Delhi, the capital of India.