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PLANetizen points to two interesting pieces: why don't small towns die? and a world-wide quality of life survey. The former is an article from American Scientist, "Small Town Story," [DOI] which attempts to model American migration patterns. Apparently small urban environments, of less than 1000 souls, don't just wither up and blow away: The number of small urban areas is relatively constant. The latter piece uses New York City as its baseline. I guess that means New York is normal?