Which model is most closely associated with the idea of a city’s interaction being driven by population and distance, independent of other factors?

Which model is most closely associated with the idea of a city’s interaction being driven by population and distance, independent of other factors?

• A. The Griffin-Ford Latin American City Model
• B. The Urban Realms Model
• C. The Gravity Model
• D. Zipf's Law

Answer: (C)

Interactions between places scale with how big the places are and shrink with distance. The gravity model expresses this by saying the flows between two cities are proportional to the product of their populations and inversely related to the distance between them (often with distance raised to a power). So, bigger cities attract more interaction, and farther apart reduces it, in a simple, factors-isolated way. The idea is to isolate population mass and distance to explain spatial interaction, unlike other models that focus on city layout, suburban realms, or city-size distributions. The Latin American City Model describes city structure with a central spine and socio-spatial sectors, not general interaction patterns. The Urban Realms Model centers on interconnected suburban realms around a core city. Zipf's Law explains how city sizes are distributed, not how places interact. So the gravity model best fits the concept.

Interactions between places scale with how big the places are and shrink with distance. The gravity model expresses this by saying the flows between two cities are proportional to the product of their populations and inversely related to the distance between them (often with distance raised to a power). So, bigger cities attract more interaction, and farther apart reduces it, in a simple, factors-isolated way. The idea is to isolate population mass and distance to explain spatial interaction, unlike other models that focus on city layout, suburban realms, or city-size distributions. The Latin American City Model describes city structure with a central spine and socio-spatial sectors, not general interaction patterns. The Urban Realms Model centers on interconnected suburban realms around a core city. Zipf's Law explains how city sizes are distributed, not how places interact. So the gravity model best fits the concept.