Why do some countries concentrate population in one dominant city, and what are the consequences?
Explain urban concentration, primate cities and the rank-size pattern, and their consequences
A focused WACE Year 12 Geography answer on urban concentration and primate cities. Covers the primate-city and rank-size patterns, the causes of concentration, and the consequences of unbalanced urban systems with real examples.
Reviewed by: AI editorial process; not yet individually human-reviewed
Have a quick question? Jump to the Q&A page
What this dot point is asking
SCSA wants you to describe how urban populations are distributed across a country's settlement system, explain why concentration occurs, and evaluate its consequences. A strong answer uses the primate-city and rank-size concepts and named examples.
Describing the urban system
Geographers compare cities within a country to see how balanced the settlement system is.
The contrasting pattern is the rank-size distribution, where the second city is roughly half the largest, the third a third, and so on, producing a balanced hierarchy of cities of many sizes, as in much of the United States and Germany.
Why concentration occurs
Concentration is driven by cumulative causation: once a city leads, it attracts more investment, jobs, migrants and infrastructure, which makes it more attractive still.
- Agglomeration economies. Firms benefit from clustering near suppliers, customers and skilled labour.
- Capital functions. Government, head offices and key institutions concentrate in one centre.
- Colonial and historical legacy. Many primate cities began as colonial ports or capitals that captured early advantage.
- Infrastructure focus. Investment in the leading city reinforces its dominance.
Consequences of urban concentration
Concentration has real benefits: it pools talent and infrastructure, lifts productivity, and drives innovation and national growth. But extreme primacy carries costs.
- Regional drain. A dominant city pulls people, investment and talent from other regions, leaving them stagnant.
- Overload. The primate city suffers congestion, housing stress, pollution and high living costs.
- Vulnerability. Concentrating so much in one place raises risk from disasters and economic shocks.
- Political imbalance. Power and services concentrate in the centre, disadvantaging the periphery.
Planning implications
Concentration and primacy are central to planning. Governments respond with decentralisation policies, regional development incentives, and investment in second cities to rebalance growth. A strong answer links the pattern to the policy response and judges whether a more balanced system would be more sustainable.