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Are the world’s megacities too big? / Klaus Desmet  and  Esteban Rossi-Hansberg , VoxEU.org, 12/03/2011http://www.voxeu.org/index.php?q=node/6202Are the world’s megacities becoming a sprawling, overfed, and  uncontrollable mass that needs to be restrained for the good of society  and the environment? This column suggests that policies aimed at  reducing the dispersion in city sizes will hardly improve the wellbeing  of the people who live there. If anything, in some developing countries,  such as China, large cities may actually be too small...