Which feature is central to Central Place Theory's explanation of market areas?

• A. A circular service area model with continuous gradients.
• B. A linear chain of settlements along transport corridors.
• C. Random distribution of towns with no central influence.
• D. Hexagonal service areas that optimize distance to central places.

Answer: (D)

Central Place Theory explains market areas as a geometric solution to how far people travel to reach a central place and how much they can buy there. The key idea is that, in a uniform landscape with equal travel costs in all directions, the most efficient way to parcel space so each central place serves a fair, complete catchment is a hexagonal region. Hexagons tessellate the plane without gaps or overlaps and, for a given level of goods, minimize the average distance customers must travel to the central place. This creates regular, nested market areas around centers of different orders.

So the central feature is hexagonal service areas that optimize distance to central places. The other ideas—circular, linear chains, or random distributions—don’t produce this uniform, gap-free coverage under the theory’s assumptions about distance, reach, and the need for evenly sized catchments.