Rank-Size Rule
Definition: Relatively developed societies produce a pattern in the size of their cities according to a mathematical formula.
“Ideal” line
How Well does the USA fit? New York City, NY 8.4 m Los Angeles, CA 3.8 m Chicago, IL 2.7 m Houston, TX 2.1 m Philadelphia, PA 1.5 m Phoenix , AZ 1.4 m San Antonio, TX 1.2 m San Diego, CA 1.3 m Dallas, TX 1.1 m San Jose, CA 945,000
U.S. Line - 2007
How does the U.S. Compare?
PRIMATE CITIES In less developed countries/regions the largest city is overly large. The pattern of settlements is such that the largest settlement has more than twice as many people as the second largest settlement.
Mexico México City 8.6 m Guadalajara 1.6 m France Paris 9.6 m Country Primate City Population Next largest city Mexico México City 8.6 m Guadalajara 1.6 m France Paris 9.6 m Marseille 1.3 m United Kingdom London 7 m Birmingham 1 m Thailand Bangkok 7.5 m Nanthabury 481,000 Denmark Copenhagen Århus 200,000 Romania Bucharest 1.9 m Iasi 315,000
Why do we care? Interesting math! Countries that have good rank-size distribution improve the quality of life of their citizens. A regular hierarchy (USA) indicates that a society is wealthy enough to provide services for its people. Absence of rank-size means people may struggle to access large urban settlements, thus high level services like hospitals.