Those cities with populations over five million, generate more than 100 USD billion and enjoy a per capita GDP above 12 000 USD (World Bank’s criterion for the high income category). The combination of those criteria brings up a selection of 16 cities. While those cities account for 30 percent of national GDP, their population share is only at 12 per cent.
Not all megacities are selected. For example, Chongqing, home for a population of 30 million, which boasts GDP above 100 USD billion, does not reach the per capita GDP high-income criterion.
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1: Fung Global Institute