Hierarchical organization of cities and nations

Details Hierarchical organization of cities and nations Hierarchical organization of cities and nations

2000-05-10

arxiv.org/abs/cond-mat/0005178v1

Physics

Condensed Matter

Statistical Mechanics

4 pages, 1 figures (5 panels)

Scientific paper

Universality in the behavior of complex systems often reveals itself in the form of scale-invariant distributions that are essentially independent of the details of the microscopic dynamics. A representative paradigm of complex behavior in nature is cooperative evolution. The interaction of individuals gives rise to a wide variety of collective phenomena that strongly differ from individual dynamics---such as demographic evolution, cultural and technological development, and economic activity. A striking example of such cooperative phenomena is the formation of urban aggregates which, in turn, can be considered to cooperate in giving rise to nations. We find that population and area distributions of nations follow an inverse power-law behavior, as is known for cities. The exponents, however, are radically different in the two cases ($\mu \approx 1$ for nations, $\mu \approx 2$ for cities). We interpret these findings by developing growth models for cities and for nations related to basic properties of partition of the plane. These models allow one to understand the empirical findings without resort to the introduction of complex socio-economic factors.

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