The population density of geographical locations typically correlates strongly with the economic strength of the area; high population density is usually an indicator of lower economic status and vice versa. This is starkly realised between Sandton and Alexandra – despite sharing a border, the population density of Alexandra is 15.5 times greater than Sandton (22 241 vs 1 435 people/sq. km), but the average income is 7 times less (R3 850 v R27 400).

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Source: one