1. The Urban Hierarchy Rule
Compare two different systems of city distribution.
City 1
12M
City 2
6M
City 3
4M
City 4
3M
Rank-Size Rule
nth largest city = 1/n size of largest
Common in MDCs (like USA, Germany). Indicates a balanced distribution of wealth and services. No single city dominates the entire country.
Example: United States
PSO-6.C.1 2. The Gravity Model (Interaction)
Interaction Strength
Low
Interaction = (Pop A × Pop B) / Distance²
3. Christaller's Central Place Theory
Hexagonal hinterlands based on Range and Threshold.
Big City
Range: High
Threshold: High
People will travel long distances for these specialized services. Requires a massive population to support.
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