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This graph compares 300 cities according to population versus gross metropolitan product. By plotting the log of GMP against the log of population, the graph looks like a straight line, even though the relationship is a power law of population. The distance of each red dot from the blue line shows the exceptionality of the city.
Credit: L. Bettencourt, et al/PLoS ONE
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Also, how were the cities selected? How does GMP per capita for cities compare to GMP per capita for suburbs? For rural areas? How does GMP per capita vary with population density, i.e., people per square mile?
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