The minimum number of people needed to support the service.

• A. Range
• B. Threshold
• C. Market area (hinterland)
• D. Central Place Theory

Answer: (B)

The main idea here is threshold—the minimum number of people required for a service to be financially viable. A facility like a store, restaurant, or clinic has fixed costs (rent, salaries, utilities) and variable costs, and it needs enough customers to cover those costs and make a profit. If the local population (or potential demand) is below that minimum, the business can’t operate profitably, no matter how good the location is or how convenient the service seems. That minimum size of needed customers is what the threshold represents.

This differs from range, which is about how far people are willing to travel to use the service, or from the market area (hinterland), which is the geographic area from which the service attracts customers. Central Place Theory is the broader framework that explains how settlements and services organize themselves spatially, including how thresholds and ranges interact to create patterns of cities and their services.