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"I honestly believe they combine the CSAs in order to make American cities look bigger in comparison to international cities and metros. It allows marketers to say that  (for example) Washington is a city with ten million people. I expect that in 2020 they'll combine the New York and Philadelphia CSAs, allowing the US to have a \"city\" of 30 million. There is some cachet in large cities, and without CSA amalgamation, the US has no cities in the international top 10.\n \n"
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