Economics of inequality and poverty

Inequality

A situation in which economic resources, income, or wealth are distributed unevenly across individuals or groups in society. Two dimensions: INCOME INEQUALITY — unequal distribution of the flow of earnings. WEALTH INEQUALITY — unequal distribution of the stock of assets. Inequality is a universal feature of all economies — the policy debate concerns how much inequality is acceptable and what should be done about it.

Income

A FLOW of earnings received over a period of time — wages, salaries, profits, rent, interest, transfer payments. Income is what people receive; wealth is what people own. High-income individuals may have low wealth (young professionals with high salaries but no savings); high-wealth individuals may have low income (retirees living off assets).

Wealth

The total value of ASSETS owned by an individual or household at a point in time — financial assets (shares, bonds, savings), physical assets (property, land, vehicles, jewellery), minus liabilities (debts, mortgages). Wealth is a STOCK concept. Wealth inequality is significantly greater than income inequality in all countries. EXAMPLE: In the USA, the top 1% own approximately 32% of total wealth; the bottom 50% own approximately 2%.

Sources of Income

(1) WAGES AND SALARIES — compensation for labour (largest source for most households). (2) PROFIT — returns to entrepreneurship and capital ownership (dividends, business income). (3) RENT — returns to land and property ownership. (4) INTEREST — returns to financial capital (savings, bonds). (5) TRANSFER PAYMENTS — government payments (pensions, unemployment benefits, child allowances). Factor incomes (wages, profit, rent, interest) reflect market-determined returns to factors of production. Transfer payments reflect government redistribution.

Causes of Income Inequality

(1) DIFFERENCES IN WAGES — reflect differences in education, skills, experience, productivity, and bargaining power. (2) OWNERSHIP OF CAPITAL — returns to capital (profits, dividends, rent, interest) accrue disproportionately to wealthy asset owners. (3) DISCRIMINATION — gender, racial, ethnic pay gaps persist in most economies. (4) SKILL-BIASED TECHNOLOGICAL CHANGE — technology raises demand for high-skilled workers relative to low-skilled → wage premium for education widens. (5) GLOBALISATION — competition from low-wage economies reduces wages for low-skilled workers in developed countries; increases returns to capital. (6) DECLINE OF TRADE UNIONS — reduced worker bargaining power → labour's share of national income falls. (7) TAX AND TRANSFER POLICIES — less progressive systems → more post-tax inequality. (8) INHERITANCE — intergenerational transmission of wealth → inequality reproduces across generations.

Causes of Wealth Inequality

(1) INHERITANCE — wealth passed between generations → compounds over time. (2) RETURNS TO CAPITAL (Piketty: r > g) — when the rate of return on capital exceeds economic growth, wealth concentrates at the top. (3) ASSET PRICE INFLATION — rising house prices and share values disproportionately benefit existing asset owners. (4) DIFFERENTIAL SAVING RATES — higher-income households save more → accumulate more wealth. (5) ENTREPRENEURSHIP — successful entrepreneurs create large wealth rapidly. (6) EDUCATION AND HUMAN CAPITAL — higher education → higher income → more saving → more wealth accumulation. (7) LUCK AND CIRCUMSTANCE — family background, geography, health, social connections.

Piketty's r > g Thesis

Thomas Piketty (Capital in the Twenty-First Century, 2013) argued that when the rate of return on capital (r) exceeds the rate of economic growth (g), wealth inevitably concentrates among capital owners — inequality tends to rise in the long run. Historical evidence: r ≈ 4–5% historically; g ≈ 1–2% in peacetime → wealth concentration rises. The relative equality of the mid-20th century (1945–1980) was exceptional — caused by two world wars destroying capital, progressive taxation, and fast growth. Since 1980: r > g has reasserted itself → rising wealth inequality globally. Policy response: global wealth tax (controversial — requires international cooperation to prevent capital flight).

The Lorenz Curve

A graphical representation of the cumulative distribution of income (or wealth) in an economy. Construction: rank the population from poorest to richest. X-axis: cumulative % of population (0–100%). Y-axis: cumulative % of income (0–100%). The 45° LINE OF PERFECT EQUALITY: if the bottom 20% of people earn exactly 20% of income, bottom 40% earn 40%, etc. — perfect equality. The actual LORENZ CURVE bows below this line — the greater the bow, the greater the inequality. Every point on the Lorenz curve is read as: "The bottom X% of the population earn Y% of total income."

DIAGRAM — Lorenz Curve

Draw a square with X-axis = "Cumulative % of population" (0 to 100%) and Y-axis = "Cumulative % of income" (0 to 100%). Draw the 45° diagonal line from (0,0) to (100,100) — label "Line of perfect equality." Draw the Lorenz curve below this line, bowing toward the bottom-right corner, starting and ending at the same points — label "Lorenz curve." AREA A = between the 45° line and the Lorenz curve. AREA B = below the Lorenz curve. Gini coefficient = A ÷ (A + B). A more bowed Lorenz curve = greater area A = higher Gini = more inequality.

Gini Coefficient

A single numerical measure of income or wealth inequality derived from the Lorenz curve. FORMULA: Gini = A ÷ (A + B). RANGE: 0 = perfect equality (Lorenz curve = 45° line, A = 0). 1 = perfect inequality (one person has all income, A = entire triangle). IN PRACTICE: Gini ranges from ~0.24–0.35 in most developed economies to ~0.45–0.65 in highly unequal developing economies. EXAMPLES: Slovenia ≈ 0.24 (most equal in EU), Austria ≈ 0.30, Germany ≈ 0.31, USA ≈ 0.39, Brazil ≈ 0.53, South Africa ≈ 0.63 (most unequal major economy).

Gini Coefficient — Limitations

(1) SINGLE NUMBER — hides the distribution within the bottom 99% (two countries with the same Gini can have very different distributions — one may have a large middle class, another may not). (2) DOES NOT CAPTURE WEALTH — typically measures income inequality; wealth inequality (much larger) requires separate measurement. (3) PRE-TAX vs POST-TAX — market income Gini (before taxes/transfers) is much higher than disposable income Gini (after) — important to specify which. (4) DOES NOT CAPTURE SOCIAL MOBILITY — a high-inequality society with high mobility may be less concerning than a low-inequality society with rigid class structures. (5) CROSS-COUNTRY COMPARISONS — differences in methodology make international comparisons imperfect.

Income Quintile Ratio (S80/S20)

The ratio of total income received by the top 20% of the population to total income received by the bottom 20%. S80/S20 = Income share of top quintile ÷ Income share of bottom quintile. EXAMPLE: EU average S80/S20 ≈ 5 — the richest 20% earn 5 times more than the poorest 20%. Bulgaria ≈ 8 (high inequality); Czech Republic ≈ 3.5 (low inequality); Austria ≈ 4.5. Simpler to understand than the Gini but loses information about the middle of the distribution.

Palma Ratio

The ratio of the income share of the top 10% to the income share of the bottom 40%. Proposed by Gabriel Palma who observed that the middle 50% (deciles 5–9) tend to capture roughly 50% of income in most countries — the variation in inequality comes primarily from the top 10% vs bottom 40%. Palma ratio focuses on the most politically relevant comparison. EXAMPLE: USA Palma ratio ≈ 1.9; Denmark ≈ 0.9; South Africa ≈ 6.9.

Absolute Poverty

A state in which individuals lack sufficient income to meet the most basic physical needs for survival — food, clean water, shelter, basic healthcare and clothing. Defined by an absolute monetary threshold. WORLD BANK INTERNATIONAL POVERTY LINES (2022): $2.15/day (extreme poverty, 2017 PPP); $3.65/day (lower-middle income countries); $6.85/day (upper-middle income countries). In 2022: approximately 700 million people (8.5% of global population) live below $2.15/day — mostly in sub-Saharan Africa and South Asia. Progress: absolute poverty fell from 36% of global population in 1990 to 8.5% in 2022 — mainly due to China's growth.

Relative Poverty

A state in which individuals have income significantly below the typical (median) income for their society — they are poor relative to prevailing living standards in their country. Usually defined as household income below 60% of the national MEDIAN income. Not a fixed threshold — it moves as median income changes. Relative poverty is the relevant concept for developed economies (no one in Austria is absolutely poor by World Bank standards). EXAMPLE: EU relative poverty threshold in Austria ≈ €1,400/month. In 2022: approximately 21.6% of EU population at risk of poverty or social exclusion.

Poverty Trap

A situation where individuals or households are trapped in poverty because the structure of the benefit system and tax system means that earning more income results in little or no improvement in net income — or even a fall. Caused by: high effective marginal tax rates on low incomes (as earnings rise, benefits are withdrawn and taxes rise simultaneously → net income barely increases → little incentive to work more or earn more). EXAMPLE: A person on welfare who earns €100 more per month but loses €90 in benefits and pays €20 more in tax → net gain only €−10 → poverty trap. Policy solution: taper benefit withdrawal more gradually (Universal Credit in UK attempts this), earned income tax credits (USA EITC).

Policies to Reduce Inequality and Poverty — Overview

(1) PROGRESSIVE TAXATION — higher tax rates on higher incomes → reduces market income inequality. (2) TRANSFER PAYMENTS — cash payments to low-income households → raises their income directly. (3) PROVISION OF PUBLIC SERVICES — free/subsidised education, healthcare, housing → reduces effective inequality. (4) MINIMUM WAGE — raises earnings of lowest-paid workers. (5) WEALTH TAXES — taxes on inheritance, capital gains, property → reduce wealth concentration. (6) ACTIVE LABOUR MARKET POLICIES — retraining, job placement services → reduce structural unemployment. (7) EQUAL OPPORTUNITIES POLICIES — anti-discrimination laws, affirmative action, universal childcare → address structural disadvantages.

Progressive Taxation

A tax system in which the MARGINAL TAX RATE increases as income rises — higher earners pay a higher percentage of their income in tax. EXAMPLE: Austria income tax rates (2023): 0% on income up to €11,693; 20% up to €18,000; 30% up to €31,000; 41% up to €60,000; 48% up to €90,000; 50% up to €1,000,000; 55% above €1,000,000. Effect: reduces post-tax income inequality relative to pre-tax (market) income. The Gini falls significantly after progressive tax + transfers in most developed economies. TRADE-OFF: very high marginal rates may reduce incentives to work, save, invest, and take risks → efficiency cost (Laffer curve).

The Laffer Curve

Shows the relationship between the tax rate and total tax revenue. At 0% tax rate: revenue = 0 (no tax). At 100% tax rate: revenue = 0 (no one works — no taxable income). Between these extremes: tax revenue first rises then falls as the rate increases. The revenue-maximising tax rate is somewhere between 0% and 100%. IMPLICATION: cutting tax rates from above the revenue-maximising point would INCREASE revenue (supply-side argument). CONTROVERSY: where is the revenue-maximising rate? Empirical evidence suggests it is well above current top rates in most developed economies (estimates: 50–70%). The Laffer curve is used by supply-siders to argue for tax cuts but is often misapplied.

Transfer Payments — Types

(1) UNIVERSAL TRANSFERS — paid to all regardless of income (universal child benefit, state pension). (2) MEANS-TESTED TRANSFERS — paid only to those below income/wealth thresholds (housing benefit, food stamps, social assistance). (3) CONTRIBUTORY BENEFITS — based on prior National Insurance/social security contributions (unemployment insurance, contributory state pension). (4) IN-KIND TRANSFERS — goods and services provided directly rather than cash (food vouchers, subsidised housing, free school meals). UNIVERSAL transfers have lower stigma and no poverty trap but are expensive (paid to rich and poor alike). MEANS-TESTED are more targeted but create poverty traps and administrative costs.

Universal Basic Income (UBI)

A policy proposal in which every citizen receives a regular unconditional cash payment from the government — regardless of employment status, income, or wealth. ARGUMENTS IN FAVOUR: (1) Eliminates poverty trap (no benefit withdrawal as earnings rise). (2) Reduces administrative complexity of current means-tested system. (3) Provides economic security in era of automation and job displacement. (4) Recognises unpaid work (childcare, volunteering). ARGUMENTS AGAINST: (1) Very expensive — replacing current system with adequate UBI would cost enormous sums. (2) May reduce work incentives. (3) Inflationary if not funded by equivalent tax rises. (4) May be better spent on targeted services (healthcare, education). EXPERIMENTS: Finland (2017–18), Stockton CA (USA), Kenya (GiveDirectly). Results: mixed — some positive effects on wellbeing and employment.

Provision of Public Services — Education

Publicly funded education is one of the most powerful tools for reducing inequality of OPPORTUNITY — ensuring all children have access to quality education regardless of family income. Mechanisms: (1) Reduces skill gap between children from rich and poor families. (2) Increases social mobility. (3) Generates positive externalities (higher human capital → economic growth). Evidence: countries with high-quality universal public education (Finland, South Korea) have lower inequality and higher social mobility. University tuition fees (UK, USA) create debt burden for lower-income students → reproduces inequality. FREE or low-cost university (Germany, Austria, Scandinavia) reduces this barrier.

Provision of Public Services — Healthcare

Universal public healthcare reduces inequality by: (1) Ensuring all citizens have access to healthcare regardless of income. (2) Preventing medical costs from causing poverty (medical bankruptcy virtually unknown in countries with universal health systems). (3) Improving health outcomes for low-income groups → higher productivity → reduced inequality. Evidence: USA (largely private healthcare) has worse health outcomes on most measures than European countries with universal systems, despite spending far more as % of GDP. Universal healthcare reduces the effective cost of low income — a key component of reducing poverty.

Minimum Wage as Anti-Poverty Policy

The minimum wage is a price floor in the labour market — sets a lower bound on wages for low-skilled workers. INTENDED EFFECT: raises earnings of lowest-paid → reduces wage inequality → lifts workers out of in-work poverty. STANDARD THEORY CONCERN: if set above equilibrium wage → unemployment (Qs labour > Qd labour). EMPIRICAL EVIDENCE: studies (Card and Krueger 1994; UK Low Pay Commission) find small minimum wage increases have little or no negative employment effect — because labour markets have monopsony elements (employers have wage-setting power → equilibrium wage is already below competitive level → minimum wage raises wages without significant employment loss). EFFECTIVENESS depends on level relative to median wage — too low: little impact. Too high: may cause unemployment. EXAMPLE: UK minimum wage rose from £3.60 (1999) to £11.44 (2024 National Living Wage for 21+) — real wages of lowest paid rose significantly, no major unemployment effect detected.

Wealth Taxes

Taxes on the STOCK of wealth rather than the flow of income. Types: (1) INHERITANCE TAX (estate tax) — tax on wealth transferred at death. (2) CAPITAL GAINS TAX — tax on increase in value of assets when sold. (3) ANNUAL WEALTH TAX — tax on total net wealth above a threshold each year (rare — France had ISF wealth tax, abolished 2017). (4) PROPERTY TAXES — taxes on real estate values. RATIONALE: addresses wealth inequality directly; taxes unearned windfall gains; reduces intergenerational entrenchment of wealth. PROBLEMS: (1) Capital flight — wealthy move assets to lower-tax jurisdictions. (2) Liquidity problems — asset-rich but income-poor individuals may struggle to pay. (3) Valuation difficulties — hard to value illiquid assets (private businesses, art, land). (4) Political resistance — requires international cooperation to be effective (Piketty's argument).

Equality of Opportunity vs Equality of Outcome

EQUALITY OF OPPORTUNITY: everyone has an equal chance to succeed — the process is fair even if outcomes differ (meritocracy). Focus: removing barriers to entry (discrimination, educational disadvantage, inherited wealth). Policy tools: equal access to education, anti-discrimination laws, progressive inheritance taxes. EQUALITY OF OUTCOME: the distribution of rewards itself should be more equal — regardless of the process. Focus: redistribution after the fact through taxes and transfers. PHILOSOPHICAL DEBATE: most political systems accept some combination of both — pure equality of outcome conflicts with incentives; pure equality of opportunity is not achievable given family background effects.

Social Mobility

The ability of individuals to move between different income or social classes over their lifetime (intragenerational mobility) or compared to their parents (intergenerational mobility). High social mobility = strong link between individual effort and outcomes; weak link between parental income and children's outcomes. LOW SOCIAL MOBILITY = "sticky floors" and "sticky ceilings" — poor children remain poor; rich children remain rich. Evidence: Scandinavian countries have highest intergenerational social mobility; USA and UK have lower mobility despite rhetoric of "land of opportunity." The GREAT GATSBY CURVE (Miles Corak): countries with higher inequality tend to have LOWER social mobility — inequality and immobility reinforce each other.

The Great Gatsby Curve

A cross-country relationship identified by economist Miles Corak: countries with HIGHER income inequality (higher Gini) tend to have LOWER intergenerational social mobility (stronger correlation between parents' income and children's income). Named by Alan Krueger after F. Scott Fitzgerald's novel about rigid class stratification in 1920s America. MECHANISM: high inequality → rich families invest more in children's education, networks, nutrition, healthcare → children of rich have enormous advantages → poor children cannot compete on equal terms regardless of ability → class becomes hereditary → mobility falls. IMPLICATION: inequality is self-perpetuating through the mobility channel — reducing inequality requires addressing both outcomes AND opportunities simultaneously.

Impact of Income Inequality on Economic Performance

HIGH INEQUALITY may: (1) REDUCE AGGREGATE DEMAND — lower-income households have higher MPC than wealthy; redistribution toward poor increases C. (2) REDUCE HUMAN CAPITAL ACCUMULATION — poor households under-invest in children's education and health → lower productivity → slower growth. (3) INCREASE SOCIAL TENSION and POLITICAL INSTABILITY — extreme inequality undermines social cohesion, democratic institutions, trust. (4) REDUCE INNOVATION — concentrated wealth can create rent-seeking behaviour rather than productive entrepreneurship. SOME INEQUALITY may: (5) INCENTIVISE EFFORT AND RISK-TAKING — reward for hard work, education, entrepreneurship. OPTIMAL LEVEL: some inequality is consistent with maximum growth; extreme inequality likely reduces it. IMF research (Ostry, Berg, Tsangarides 2014): income inequality reduces growth and makes growth less durable.

Inequality — Trends Globally

WITHIN COUNTRIES: inequality has RISEN in most developed economies since 1980. The Gini rose significantly in the USA, UK, China, and India. Main drivers: technology, globalisation, financialisation, declining union power, reduced top marginal tax rates. BETWEEN COUNTRIES: inequality has FALLEN since 1990 — mainly due to rapid growth in China and India lifting hundreds of millions out of poverty. Global Gini fell from ~0.70 (1990) to ~0.63 (2019). However: COVID-19 reversed some progress (2020–21). PARADOX: the world is becoming more equal BETWEEN countries but less equal WITHIN most countries.

Real World Example — Inequality (USA)

The USA has among the highest income and wealth inequality in the developed world. Gini ≈ 0.39 (income); wealth Gini ≈ 0.85. The top 1% earn ~21% of national income; the top 10% earn ~50%. Real wages for the bottom 50% have stagnated since the 1970s — median male wages barely higher in 2020 than 1979 despite doubling of GDP per capita. Causes: sharp decline in union membership (from 35% of workers in 1950s to ~10% today), skill-biased technological change, globalisation (manufacturing offshoring), declining top marginal tax rates (from 91% in 1960s to 37% today), financialisation of the economy. Consequences: highest rate of child poverty in the developed world (~17%), low social mobility (Great Gatsby Curve confirms), political polarisation, declining life expectancy in some demographic groups (particularly working-class men without college degrees — "deaths of despair").

Real World Example — Poverty Reduction (China 1990–2020)

China achieved the greatest poverty reduction in human history. In 1990: approximately 750 million Chinese people lived in absolute poverty (below $1.90/day — ~66% of population). By 2020: China declared the elimination of absolute poverty — fewer than 10 million remained below China's own poverty line. GDP per capita rose from ~$300 to ~$12,000 (2020). Mechanisms: (1) Export-led industrialisation created hundreds of millions of manufacturing jobs → rural-to-urban migration → wage income replaced subsistence farming. (2) Agricultural reforms (decollectivisation) increased rural productivity. (3) Massive infrastructure investment → reduced rural isolation → market access. (4) Expansion of education and healthcare. CAVEAT: Chinese data reliability debated; poverty line used was very low; inequality rose sharply (Gini from ~0.28 to ~0.47) — growth was NOT inclusive at the top end; environmental costs were enormous. Illustrates: rapid growth can dramatically reduce absolute poverty even while increasing relative inequality.

Real World Example — Inequality and Policy (Scandinavia)

Nordic countries (Denmark, Sweden, Norway, Finland) consistently achieve both relatively low inequality AND high living standards — challenging the assumption that equity requires sacrificing efficiency. Features: (1) Strong universal public services — education, healthcare, childcare, eldercare — all high quality and free or heavily subsidised. (2) HIGHLY PROGRESSIVE TAXATION — top marginal rates 55–60%; high wealth and capital gains taxes. (3) GENEROUS BUT CONDITIONAL TRANSFER PAYMENTS — unemployment insurance up to 90% of previous wage for limited period; strong activation requirements (must actively seek work). (4) STRONG TRADE UNIONS — collective bargaining coverage 70%+; compressed wage structure. (5) HIGH SOCIAL MOBILITY — children's outcomes less determined by parents' income than in USA or UK. RESULTS: Gini ≈ 0.27–0.30. HDI top 5 globally. Life satisfaction among highest in world (World Happiness Report). Labour force participation among highest in OECD. GDP per capita competitive with USA (Norway GDP per capita actually exceeds USA). LIMITATION: Scandinavian model may be difficult to replicate — requires strong institutions, homogeneous initial conditions, social trust. Also: immigration straining some social systems.

Real World Example — Poverty Trap (UK Universal Credit)

The UK's Universal Credit (UC) system was designed partly to address poverty traps of the previous benefit system. PREVIOUS SYSTEM: multiple overlapping benefits each withdrawn at different rates as income rose → effective marginal tax rates of 90%+ on additional earnings → severe poverty trap. UC DESIGN: consolidates six benefits into one; benefits withdrawn at 55p per £1 of additional earnings → effective marginal rate 55% (plus income tax and national insurance ≈ 33%) → total effective marginal rate on low incomes often 75–80%. PROBLEMS IN PRACTICE: (1) 5-week wait for first payment → debt and hardship. (2) Two-child limit and benefit cap create poverty traps for larger families. (3) UC has significantly reduced incomes of some groups (particularly single parents). LESSON: benefit system design is complex — eliminating all poverty traps while maintaining work incentives AND adequate support is extremely difficult with finite resources.

Inequality — Key Evaluation Points for Essays

(1) DISTINCTION between pre-tax (market) and post-tax (disposable) income inequality — progressive taxes and transfers reduce inequality significantly in most developed economies. (2) INEQUALITY of OUTCOME vs OPPORTUNITY — different policy prescriptions. (3) EQUITY-EFFICIENCY TRADE-OFF — some redistribution may reduce incentives; but extreme inequality also reduces efficiency (through mobility and demand channels). (4) RELATIVE vs ABSOLUTE poverty — growth reduces absolute poverty even when relative poverty rises. (5) INTERNATIONAL vs DOMESTIC inequality — globalisation has reduced between-country inequality while increasing within-country inequality. (6) MEASUREMENT ISSUES — Gini, Lorenz curve, S80/S20, Palma ratio each capture different aspects. (7) PIKETTY's r > g — fundamental long-run force driving wealth concentration; requires structural policy response (wealth taxes, inheritance taxes). (8) GREAT GATSBY CURVE — inequality and immobility reinforce each other → self-perpetuating inequality without intervention.