The rank-size rule is an observation about the relationship between population size and city ranking within a country. According to this rule, the nth largest city will be 1/nth the size of the largest city.
Imagine you're lining up dominoes. The largest domino (representing the largest city) is first, and each subsequent domino is smaller than the one before it. This pattern of decreasing size mirrors the rank-size rule in urban geography.
Primate City: A city that is larger than other cities in a country or region, and more significant economically and politically.
Urban Hierarchy: A ranking of settlements (hamlet, village, town, city etc.) according to their population or some other criteria.
Central Place Theory: A geographical theory that seeks to explain the number, size and location of human settlements in an urban system.
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