HIGHLIGHTS
SUMMARY
More precisely, the authors show that intra-city flows are generally along a negative population density gradient, while inter-city flows are concentrated in high-density core areas. Intra-city flows are anisotropic and generally directed towards external counties of cities, driving asymmetrical urban sprawl. Recently5,6 city population growth was shown to result from a combination of random demographic growth and, more importantly, inter-city flows from domestic migration that are broadly distributed according to a power law5. The dynamics of city population growth is usually studied at the city level, neglecting the . . .
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