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Why do sharp inequalities persist inside countries, even wealthy ones, and how do we measure them?

Explain the causes and patterns of inequality within countries and how it is measured, including spatial and social dimensions

A focused answer to the H2 Geography outcome on within-country inequality. Income and spatial inequality, core-periphery and rural-urban patterns, social inequalities, measurement with the Gini coefficient, and why inequality persists.

Generated by Claude Opus 4.89 min answer

Reviewed by: AI editorial process; not yet individually human-reviewed

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  1. What this dot point is asking
  2. The answer
  3. Examples in context
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What this dot point is asking

SEAB wants you to explain the causes and patterns of inequality within countries, both spatial and social, to show how it is measured, and to explain why it persists even in wealthy nations. The central insight is that inequality is reproduced by reinforcing mechanisms, cumulative causation in space and the inter-generational transmission of advantage in society, so it does not automatically fall as a country grows richer.

The answer

Dimensions of within-country inequality

  • Income and wealth inequality: the gap between rich and poor households.
  • Spatial inequality: differences between regions (core versus periphery) and between urban and rural areas, and within cities (rich and poor neighbourhoods).
  • Social inequality: differences by gender, ethnicity, caste or class in access to education, health, housing and opportunity.

Spatial inequality and the core-periphery model

A core region (a major city or industrial belt) attracts investment because of better infrastructure, markets, skilled labour and agglomeration economies. Success draws in more investment and migrants, Myrdal's cumulative causation, widening the gap:

  • Backwash effects drain the periphery of skilled workers, capital and resources toward the core.
  • Spread (trickle-down) effects may later diffuse growth outward through demand and redistribution, narrowing the gap, but often weakly.

The result is a wealthy, well-served core and a poorer periphery with weaker services and out-migration.

Why inequality persists

  • Inter-generational transmission: unequal access to education, capital and networks reproduces advantage across generations.
  • Place-based disadvantage: spatial concentration of jobs and services entrenches poverty in certain regions and neighbourhoods.
  • Labour-market change: technology and globalisation reward skilled workers and erode low-skill wages.
  • Discrimination: by gender, ethnicity or caste, limiting some groups.

These mechanisms mean inequality can persist or rise even as average incomes grow.

Measuring inequality

  • Gini coefficient: summarises income distribution from 0 (perfect equality) to 1 (maximum inequality), derived from the Lorenz curve (which plots cumulative income share against cumulative population share).
  • Income ratios: the share of the top versus bottom decile.
  • Access measures: to housing, health and education, capturing non-income inequality.

Examples in context

Example 1. Regional inequality in China. Rapid growth concentrated in the eastern coastal cities and special economic zones, drawing investment and hundreds of millions of migrant workers, while many inland and rural provinces lagged. The widening coastal-interior and urban-rural gaps are a clear case of cumulative causation and backwash, prompting deliberate "Go West" and rural-development policies to spread growth.

Example 2. Inequality in a high-income city-state. Singapore combines very high average income with public concern about income inequality and the cost of living, addressed through progressive taxation, housing policy and social transfers. It shows that even wealthy, well-governed societies must actively manage inequality, since market forces alone do not eliminate it.

Try this

Q1. Define the Gini coefficient and state what its values mean. [2 marks]

  • Cue. It is a single measure of income inequality from 0 to 1; 0 represents perfect equality (everyone has the same) and 1 represents maximum inequality (one person has all income).

Q2. Explain the backwash effect in the core-periphery model. [2 marks]

  • Cue. As the core grows, it draws skilled workers, capital and resources away from the periphery toward itself, so the periphery loses its means of development and the gap widens.

Q3. Explain why inequality can persist across generations. [3 marks]

  • Cue. Advantaged families pass on better access to education, capital and networks, so their children gain higher-paying opportunities, while disadvantaged families cannot, reproducing the income and opportunity gap over time.

Exam-style practice questions

Practice questions written in the style of SEAB exam questions on this dot point, with worked answer explainers. The year tag is the paper they imitate, not the source.

Original10 marksExplain the causes of spatial inequality within a country, using the core-periphery model.
Show worked answer →

Argument: spatial inequality within a country arises because investment, jobs and services concentrate in a core region through cumulative causation, while peripheral regions lag and may even decline.

Process to explain: a core region (often a major city or industrial belt) attracts investment because of better infrastructure, markets, skilled labour and agglomeration economies. Success draws in more investment and migrants, a positive feedback Myrdal called cumulative causation, widening the gap. Backwash effects drain the periphery of its most skilled workers, capital and resources toward the core, deepening peripheral disadvantage. Spread (trickle-down) effects, where growth eventually diffuses outward through demand for food and materials and government redistribution, may later narrow the gap, but often weakly.

Patterns: this produces a wealthy, well-served core and a poorer periphery with weaker services, fewer jobs and out-migration, plus rural-urban contrasts.

Markers reward cumulative causation, backwash and spread effects, and the resulting core-periphery pattern, ideally with the idea that the gap may widen before it narrows.

Original12 marksAssess why inequality persists within countries, including wealthy ones, and how it can be measured.
Show worked answer →

Argument: inequality persists because of reinforcing economic, social and spatial mechanisms, and it is measured by indicators such as the Gini coefficient and ratios between richest and poorest groups.

Causes of persistence: uneven access to education, capital and opportunity reproduces advantage across generations; spatial concentration of jobs and services (core-periphery, rich and poor neighbourhoods) entrenches place-based disadvantage; labour-market change rewards skilled workers and erodes low-skill wages; discrimination by gender, ethnicity or caste limits some groups; and globalisation and technology can widen gaps even as average incomes rise.

Measurement: the Gini coefficient summarises income distribution on a scale from 0 (perfect equality) to 1 (maximum inequality), derived from the Lorenz curve; ratios such as the income share of the top versus bottom decile, and measures of access to housing, health and education, capture other dimensions.

Evaluation: a strong answer explains that even rich countries show high inequality where market forces are strong and redistribution limited, and judges which mechanisms dominate in a given context. Markers reward a structured set of causes, correct use of the Gini coefficient and Lorenz curve, and a reasoned judgement.

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