Rank Size Rule

Definition

The Rank-Size Rule states that in a country with an even distribution of cities, the nth-largest city will have 1/n the population of the largest city. For example, if the largest city has 10 million people, the second-largest should have about 5 million, the third about 3.3 million, and so on. The United States closely follows this pattern: New York City (~8.3 million) is roughly twice the size of Los Angeles (~4 million). The rule was formalized by linguist George Zipf in 1949, which is why it is sometimes called Zipf's Law. Countries that do not follow the rank-size rule often have a primate city, where one city dominates the urban hierarchy (like Paris in France or Bangkok in Thailand). On the AP Human Geography exam, the rank-size rule is frequently contrasted with the primate city concept.

5 Must Know Facts For Your Next Test

1. The Rank Size Rule can be visually represented by plotting the population of cities on a graph where the x-axis represents rank and the y-axis represents population, resulting in a straight line for countries that follow this rule.
2. Countries like the United States and Germany typically follow the Rank Size Rule closely, while countries such as Thailand and Mexico show deviations due to having a primate city.
3. In places that adhere to the Rank Size Rule, smaller cities often provide different levels of services compared to larger cities, contributing to a balanced distribution of urban resources.
4. The Rank Size Rule helps urban planners and geographers understand settlement patterns, making it easier to predict future urban growth and infrastructure needs.
5. Exceptions to the Rank Size Rule can indicate significant socio-economic disparities or historical influences on urban development within a region.

Review Questions

• How does the Rank Size Rule help in understanding urban hierarchies within a country?
  • The Rank Size Rule illustrates how cities are organized based on their population sizes, allowing geographers to identify patterns in urban hierarchies. By establishing that smaller cities are proportionally smaller than larger ones, this rule helps clarify the distribution of services, resources, and economic opportunities across different urban areas. Understanding these hierarchies aids in urban planning and resource allocation for both public services and infrastructure development.
• Discuss how deviations from the Rank Size Rule can impact regional development and planning.
  • Deviations from the Rank Size Rule often signal a concentration of resources and services in one primate city, which can lead to imbalanced regional development. In regions where one city dominates, surrounding areas may experience underdevelopment due to lack of investment or infrastructure. This imbalance necessitates targeted regional planning strategies to ensure equitable development across all urban centers, promoting sustainable growth and reducing inequality.
• Evaluate the implications of applying the Rank Size Rule to predict future urban growth trends in developing nations.
  • Applying the Rank Size Rule to developing nations can provide valuable insights into potential urban growth trends by revealing expected patterns of settlement organization. However, it is essential to consider local socio-economic conditions, historical contexts, and cultural factors that may influence urbanization differently than in developed countries. This evaluation should also account for rapid urban migration patterns that can disrupt traditional growth models. By integrating these variables with the Rank Size Rule, planners can create more effective strategies for accommodating future urban growth while addressing inequalities.

Related terms

Urban Hierarchy:

A system that ranks cities based on their population size and economic functions, demonstrating how cities serve as centers for services and administration.

Central Place Theory:

A geographical theory that explains the size and distribution of human settlements, suggesting that cities serve as 'central places' for providing goods and services to surrounding areas.

Primate City:

A city that is significantly larger than any other city in a country or region, often serving as the political, economic, and cultural hub.