A World of Cities: The Causes and Consequences of Urbanization in Poorer Countries
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Historically, urban growth required enough development to grow and transport significant agricultural surpluses or a government effective enough to build an empire. But there has been an explosion of poor mega-cities over the last thirty years. A simple urban model illustrates that in closed
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美国国家经济研究局创建时间：
2013-12-01
