Why aren’t density independent factors based on population size?

Density and density-independent factors for populations. Density-independent variables including geography and atmosphere affect city size independently of population density. The effects of density-dependent factors are, however, steadily increasing as the population grows.

Explanation:

Density and density-independent factors for populations. Density-independent variables including geography and atmosphere affect city size independently of population density. The effects of density-dependent factors are, however, steadily increasing as the population grows.

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