Tokyo and Seoul show that areas around Beijing, Shanghai and Hong Kong will go from 15% to 60% of China’s population

South Korea tried to control the size of Seoul half a century ago. In Seoul’s first Basic Urban Plan, in 1966, its population was expected to grow from three to five million by 1985. But it hit that target in 1970. Now half of the population of South Korea is in Seoul. South Korea’s government …

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