Why are there so many small villages but so few large cities?

Countries & Cities · Published 30 September 2026 · Updated 25 October 2026 Swipe more like this →

In short: Central-place theory explains the logic behind our urban landscape. By analyzing how settlements provide goods and services, geographers can predict why towns are spaced the way they are, why cities are rare, and how the distance you travel for a loaf of bread differs from your journey for jewelry.

Introduced by German geographer Walter Christaller in his 1933 book Central Places in Southern Germany, central-place theory provides a framework for understanding the size, number, and distribution of settlements. At its core, the theory posits that the primary function of a town is to act as a central place, providing goods and services to a surrounding market area. These settlements form a hierarchy: lower-order places, such as hamlets or villages, provide frequently purchased goods, while higher-order places, like cities, offer specialized services that are less frequently required.

The theory relies on two fundamental concepts: threshold and range. The threshold is the minimum market area—in terms of population or income—required to make a business economically viable. The range is the maximum distance a consumer is willing to travel to obtain a specific good. Because consumers act rationally to minimize travel costs, they visit the nearest location that offers the desired service. This behavior dictates that higher-order places, which require larger thresholds, are fewer in number and spaced further apart than lower-order places.

Christaller’s model assumes a uniform, flat plane with constant population density and equal purchasing power, where transportation is equally easy in all directions. To maximize efficiency without market overlap, he proposed that these settlements would organize into a triangular-hexagonal lattice. Later, in 1940, German economist August Lösch expanded this work in The Spatial Organization of the Economy, mathematically deriving various systems that allowed for specialized places and richer areas. While American geographers like Edward Ullman introduced these ideas to the United States in 1941, empirical research in places like Iowa and Wisconsin has shown that real-world geography only approximates these idealized theoretical conditions.

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