Equity, poverty and inequality: measurement and policies

What you'll learn

This topic examines how economists measure and address differences in living standards within and between economies. You will learn to distinguish between equity and equality, analyse measurement tools such as the Lorenz curve and Gini coefficient, and evaluate government policies designed to reduce poverty and narrow income gaps.

Key terms and definitions

Equity — fairness in the distribution of income and wealth; achieved when resources are distributed according to need rather than equally

Equality — a situation where income or wealth is distributed identically across all members of society

Poverty — a situation where individuals lack sufficient income to afford a minimum acceptable standard of living

Absolute poverty — the inability to afford basic necessities such as food, clean water, shelter, and clothing required for survival

Relative poverty — living below a certain percentage (typically 50-60%) of the median income in a particular country

Lorenz curve — a graphical representation showing the cumulative percentage of income earned by cumulative percentages of the population

Gini coefficient — a numerical measure of income inequality ranging from 0 (perfect equality) to 1 (perfect inequality), derived from the Lorenz curve

Progressive tax — a tax system where the proportion of income paid in tax rises as income increases

Core concepts

Understanding equity versus equality

Equity and equality represent different approaches to distribution. Equality means everyone receives the same, regardless of circumstances. A policy giving every citizen £1,000 treats all equally. Equity focuses on fairness and need — providing more to those with greater needs.

An equitable policy might give £2,000 to low-income families and £500 to high-income families, recognising different needs. Most governments aim for equity rather than strict equality because:

• People have different needs (families with children versus single adults)
• Some face disadvantages requiring additional support (disabilities, unemployment)
• Equal treatment may perpetuate unfairness (equal healthcare spending per person ignores that elderly people require more medical care)

Equity promotes social justice — ensuring everyone can achieve a minimum acceptable standard of living.

Types of poverty

Absolute poverty describes survival-level deprivation. The World Bank defines extreme absolute poverty as living on less than $2.15 per day (2022 figures). People in absolute poverty cannot afford:

• Adequate nutrition (minimum daily calories)
• Clean drinking water
• Basic shelter
• Essential clothing
• Primary healthcare

Absolute poverty remains prevalent in low-income countries, particularly in Sub-Saharan Africa and parts of South Asia.

Relative poverty measures deprivation compared to average living standards in a particular society. In the UK, households earning less than 60% of median income experience relative poverty. Someone in relative poverty might afford food and shelter but cannot:

• Participate fully in society
• Replace worn-out furniture or appliances
• Afford school trips for children
• Heat their home adequately in winter

Relative poverty exists in all economies, including high-income countries. As median incomes rise, the relative poverty threshold increases, meaning fewer people may escape this classification even if absolute living standards improve.

Causes of poverty and income inequality

Multiple factors create and perpetuate poverty:

Individual factors:

• Low educational attainment limiting job opportunities
• Poor health or disability reducing earning capacity
• Unemployment or underemployment
• Large family size relative to income

Structural factors:

• Discrimination based on gender, ethnicity, or age
• Lack of access to quality education
• Unequal ownership of wealth (land, property, shares)
• Economic structure favouring certain skills

Geographical factors:

• Regional unemployment concentrated in former industrial areas
• Urban-rural income divides
• Poor infrastructure limiting opportunities in certain areas

Macroeconomic factors:

• Economic recession increasing unemployment
• Inflation eroding purchasing power of fixed incomes
• Globalisation creating winners (high-skilled workers) and losers (workers in declining industries)

Income inequality tends to widen when:

• Returns to education increase (technology rewards skilled workers)
• Tax systems become less progressive
• Social security benefits fail to keep pace with wage growth
• Wealth generates investment income, benefiting asset owners

Measuring income distribution: the Lorenz curve

The Lorenz curve provides a visual representation of income inequality. The horizontal axis shows cumulative percentage of population (ranked from poorest to richest). The vertical axis shows cumulative percentage of income.

Key features:

• The line of perfect equality runs diagonally at 45° — at any point, x% of the population earns x% of income
• The actual Lorenz curve bows below this line (unless perfect equality exists)
• Greater distance between the Lorenz curve and the line of equality indicates greater inequality
• Points on the curve are cumulative: "the poorest 40% earn 15% of total income"

Example interpretation: If the Lorenz curve shows the poorest 60% of the population earn 30% of national income, this reveals significant inequality — the richest 40% earn 70% of income.

The Gini coefficient

The Gini coefficient converts the Lorenz curve into a single numerical value between 0 and 1 (sometimes expressed as 0-100):

• Gini = 0 (perfect equality): everyone earns identical income
• Gini = 1 (perfect inequality): one person earns all income

The coefficient equals the area between the line of equality and the Lorenz curve, divided by the total area under the line of equality.

Typical Gini coefficients:

• Scandinavian countries (Norway, Sweden): 0.25-0.30 (relatively equal)
• UK: approximately 0.35
• USA: approximately 0.41
• South Africa, Brazil: 0.60+ (highly unequal)

Advantages of the Gini coefficient:

• Single number allows easy comparison between countries or across time
• Internationally recognised standard
• Based on entire income distribution

Limitations:

• Same coefficient can result from different distribution patterns
• Doesn't reveal whether inequality exists among the poor or the rich
• Ignores non-income factors affecting living standards (public services, wealth)
• May not capture informal economy income

Government policies to reduce poverty and inequality

Governments employ various policy tools to address poverty and narrow income gaps.

Progressive taxation

Progressive taxes take a larger percentage of income as income rises. The UK income tax system (2023/24) illustrates this:

• 0% on income below £12,570 (personal allowance)
• 20% on income £12,571-£50,270 (basic rate)
• 40% on income £50,271-£125,140 (higher rate)
• 45% on income above £125,140 (additional rate)

Someone earning £20,000 pays an average tax rate of approximately 7.4%, while someone earning £200,000 pays approximately 40%. This reduces post-tax income inequality.

Evaluation:

• Provides revenue to fund anti-poverty programmes
• Directly reduces income inequality
• May discourage work effort or enterprise at very high rates
• High earners might relocate to lower-tax jurisdictions

Transfer payments

Governments redistribute income through transfer payments — money transferred to individuals without receiving goods or services in return:

• Universal Credit (UK) — support for low-income working-age people
• State pensions
• Child benefit
• Disability benefits
• Housing support

These payments establish an income floor, preventing absolute poverty in high-income countries.

Evaluation:

• Provides immediate poverty relief
• Reduces inequality by targeting low-income households
• May create unemployment traps if benefits fall sharply when employment starts
• Requires substantial government revenue

National Minimum Wage (NMW) and National Living Wage (NLW)

The UK mandates minimum hourly pay rates:

• National Living Wage: £10.42/hour for workers 23+ (2023)
• Lower rates for younger workers

Evaluation:

• Directly raises incomes of low-paid workers
• Reduces in-work poverty
• May cause unemployment if set above equilibrium wage (firms hire fewer workers)
• Doesn't help the unemployed or those outside the labour market

Investment in education and training

Government-funded education and skills programmes aim to break poverty cycles:

• Free state education to age 18
• Student loans for higher education
• Apprenticeship programmes
• Adult retraining schemes

Evaluation:

• Addresses root causes of low income (lack of skills)
• Long-term solution improving productivity and growth
• Benefits take years to materialise
• Expensive to provide quality education
• Doesn't help those currently in poverty

Provision of public services

Free or subsidised services reduce effective inequality:

• National Health Service (UK) — free healthcare at point of use
• State schools
• Public libraries
• Subsidised public transport

These services represent income in kind — benefits received as services rather than cash. A family using NHS services worth £5,000 annually effectively has £5,000 more purchasing power for other goods.

Evaluation:

• Benefits all but proportionally helps low-income households more
• Reduces inequality not captured by income measures alone
• Ensures access to essential services regardless of ability to pay
• Expensive; requires high taxation

Regional development policies

Governments target areas with high poverty concentrations:

• Tax incentives for firms locating in deprived regions
• Infrastructure investment (transport, broadband)
• Enterprise zones with reduced regulations

Evaluation:

• Addresses geographical causes of poverty
• Creates employment in high-unemployment areas
• May simply relocate economic activity rather than create new activity
• Difficult to attract firms to genuinely disadvantaged areas

Worked examples

Example 1: Interpreting a Lorenz curve (4 marks)

Question: The Lorenz curve for Country X shows that the poorest 50% of the population earn 20% of the country's total income. Analyse what this information reveals about income distribution in Country X.

Mark scheme answer:

This shows significant income inequality in Country X [1 mark]. If income were distributed equally, the poorest 50% would earn 50% of total income [1 mark]. The actual figure of 20% means the richest 50% of the population earn 80% of total income [1 mark], indicating wealth is concentrated among higher earners [1 mark].

Examiner guidance: Define/explain the significance (1 mark), reference what equality would look like (1 mark), calculate the implication for the richest group (1 mark), draw a conclusion (1 mark).

Example 2: Evaluating minimum wage policy (6 marks)

Question: Discuss whether introducing a national minimum wage is an effective way to reduce poverty.

Mark scheme answer:

A minimum wage can reduce poverty by ensuring workers receive sufficient income to afford basic necessities [1 mark]. It particularly benefits low-skilled workers in sectors like retail and hospitality who previously earned below-poverty wages [1 mark], reducing in-work poverty and inequality [1 mark].

However, a minimum wage set above the equilibrium wage may cause unemployment as firms find labour more expensive [1 mark]. This could increase poverty if workers lose jobs entirely rather than earning higher wages [1 mark]. Additionally, it doesn't help unemployed people or those unable to work, so other policies like transfer payments are also needed [1 mark].

Examiner guidance: For "discuss" questions, present both sides. Give 2-3 advantages with explanation (3 marks) and 2-3 limitations/disadvantages (3 marks). Use economic reasoning, not just listing points.

Example 3: Comparing Gini coefficients (3 marks)

Question: Country A has a Gini coefficient of 0.28 and Country B has a Gini coefficient of 0.45. Explain what these figures tell us about income distribution in these two countries.

Mark scheme answer:

Country A has a more equal distribution of income than Country B [1 mark] because its Gini coefficient is closer to 0, which represents perfect equality [1 mark]. Country B's higher coefficient of 0.45 indicates that income is more concentrated among a smaller percentage of the population [1 mark].

Examiner guidance: Always explain what the numerical difference means in practical terms. Reference the 0-1 scale. Describe what the difference implies about real income distribution.

Common mistakes and how to avoid them

• Confusing equity with equality — Remember: equality means same for everyone; equity means fair according to need. A disabled person receiving more support than others is equitable, not equal.

• Mixing up absolute and relative poverty — Absolute poverty is fixed (basic survival needs); relative poverty changes with average income levels. Someone can escape absolute poverty but remain in relative poverty.

• Misinterpreting the Lorenz curve — The curve shows cumulative percentages. If asked "what do the poorest 30% earn?" you must read the y-value at x=30, not calculate 30% of something.

• Thinking a Gini coefficient of 0.5 means "half equal, half unequal" — The Gini is not a percentage. It's a ratio measuring the area between curves. Compare Gini coefficients between countries/years; don't interpret absolute values simplistically.

• Evaluating policies one-sidedly — For "discuss" or "evaluate" questions, you must present both advantages and disadvantages. A policy answer covering only benefits will lose half the marks.

• Forgetting that policies have multiple effects — Progressive taxes reduce inequality but also reduce incentives to work/invest. Always consider unintended consequences when evaluating policies.

Exam technique for "Equity, poverty and inequality: measurement and policies"

• Master command words: "Define" (1-2 marks) requires a precise term explanation. "Explain" (2-3 marks) needs definition plus development/example. "Analyse" (3-4 marks) requires breaking down causes/effects. "Discuss/Evaluate" (6+ marks) demands balanced arguments with judgment.

• Use accurate diagrams: Draw and label the Lorenz curve correctly — label axes "cumulative % of population" and "cumulative % of income", include the 45° line of equality, and mark where the actual curve deviates.

• Structure evaluation answers: Use a two-paragraph structure for medium-length evaluation questions — one paragraph for advantages/why policy works, one for limitations/why it may fail. Conclude with a judgment weighing the arguments.

• Reference real examples: Questions often ask about poverty reduction in developing countries or inequality in your country. Brief, relevant examples from UK, Caribbean nations, or named developing countries strengthen analysis and demonstrate applied understanding.

Quick revision summary

Equity (fairness) differs from equality (sameness). Absolute poverty measures inability to afford survival needs; relative poverty compares income to societal norms. The Lorenz curve and Gini coefficient (0=equal, 1=unequal) measure income distribution. Governments reduce poverty and inequality through progressive taxes, transfer payments, minimum wages, education investment, public services, and regional policies. Each policy has advantages (raising living standards, reducing inequality) and disadvantages (costs, potential unemployment, work disincentives). Evaluation requires balanced analysis of both effects.