Topic 4: Income distribution and equity
Explain the distribution of income and wealth in Australia, the role of the tax and transfer system in redistribution, and analyse the impact of income distribution on aggregate demand, social cohesion and intergenerational equity
A focused QCE Economics Unit 4 answer on inequality. Distinguishes income from wealth, draws the Lorenz curve and defines the Gini coefficient, describes the Australian tax-transfer system, and analyses recent trends including intergenerational and housing-driven wealth inequality.
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What this dot point is asking
QCAA wants you to distinguish income from wealth, draw the Lorenz curve and define the Gini coefficient, describe the Australian tax-transfer system, and analyse the impact of inequality on AD, social cohesion and intergenerational equity. Expect a 6 to 10 mark extended response in the EA.
The answer
Income vs wealth
Income is a flow concept: payments received over a period (wages, profits, dividends, transfers).
Wealth is a stock concept: the value of assets owned (housing, super, shares) less liabilities (mortgages, debt).
Australia (like most countries) has greater inequality of wealth than of income. The top 20 percent of households hold around 60 percent of wealth but earn around 40 percent of income (ABS Survey of Income and Housing).
The Lorenz curve
The Lorenz curve plots cumulative income (or wealth) share against cumulative population share, ranked from lowest to highest.
The 45-degree line represents perfect equality. The actual Lorenz curve bows below the diagonal. The further the bow, the greater the inequality.
The Gini coefficient
The Gini coefficient is the area between the Lorenz curve and the line of equality, divided by the total area below the line of equality.
Range: 0 (perfect equality) to 1 (perfect inequality).
International comparison (2024 indicative):
| Country | Gini (after tax) |
|---|---|
| Norway, Denmark | 0.25 |
| Germany | 0.30 |
| Australia | 0.32 |
| UK | 0.35 |
| US | 0.41 |
| South Africa | 0.63 |
Income inequality in Australia
ABS Survey of Income and Housing data (indicative, equivalised disposable household income):
| Quintile | Share of income |
|---|---|
| Lowest 20% | 7% |
| Second 20% | 13% |
| Middle 20% | 18% |
| Fourth 20% | 23% |
| Highest 20% | 40% |
The top 20 percent earn about 5.7 times the bottom 20 percent.
Wealth inequality
| Quintile | Share of wealth |
|---|---|
| Lowest 20% | 1% |
| Second 20% | 5% |
| Middle 20% | 12% |
| Fourth 20% | 22% |
| Highest 20% | 60% |
The top 1 percent of households hold around 17 percent of wealth (Productivity Commission). Housing is the largest single source of wealth inequality.
Sources of inequality
- Employment status. Households with no employed adult have median income around 40 percent of average.
- Hours worked. Part-time and casual employment, especially among women.
- Education and skills. University graduates earn 70 percent more over their working lives (Grattan Institute).
- Occupation and industry. Finance, mining and ICT pay above average.
- Capital and asset returns. Capital gains from housing and equities accrue disproportionately to existing asset owners.
- Geography. Sydney and Melbourne earnings 15-20 percent above national average.
- Demographic factors. Indigenous Australians, recent migrants and people with disability have lower median incomes.
The Australian tax and transfer system
Australia's tax-transfer system is among the most redistributive in the OECD:
Progressive income tax. Rates from 0 to 47 percent (including Medicare levy).
Means-tested transfers.
- Age Pension (~$30,000 per year for a single).
- JobSeeker.
- Disability Support Pension.
- Family Tax Benefit Parts A and B.
- Parenting Payment.
- Rent assistance.
Free or subsidised services.
- Medicare (universal).
- PBS (subsidised medicines).
- Public schools and TAFE.
- Public hospitals.
- Public housing (around 5 percent of housing stock).
Compulsory superannuation.
- 11.5 percent of wages in 2024-25, rising to 12 percent from 1 July 2025.
- Reduces wealth inequality over time as low and middle-income earners accumulate balances.
These reduce the Gini coefficient by around 0.13 (from market-income 0.45 to disposable-income 0.32).
Trends
Australian income inequality has been relatively stable over the past two decades (Gini 0.32-0.34). However:
- Wealth inequality has risen. Housing price gains benefit existing homeowners (older, wealthier) at the expense of renters (younger, lower-wealth).
- Intergenerational inequality has widened. Younger cohorts hold less wealth and face higher housing costs (Productivity Commission, Wealth of Generations 2023).
- Gender pay gap fell from ~17% (2014) to ~13% (WGEA 2024).
- Indigenous gap. Median Indigenous household income around 60 percent of non-Indigenous (AIHW).
Impact of inequality on AD
- Inequality reduces aggregate demand growth
- Lower-income households have a higher marginal propensity to consume. Redistribution upward reduces total consumption.
- Empirical evidence
- OECD research finds that more unequal countries have slower long-run growth, controlling for other factors.
- Australian application
- The 2022-24 inflation episode showed inequality dynamics: real wages fell for low- and middle-income workers; high-income capital owners benefited from rising profits and asset prices. This affected consumption patterns: durable goods spending fell sharply (mortgage holders), but services spending held up (higher-income households less affected by rate rises).
Impact on social cohesion
High inequality is associated with:
- Lower social trust (OECD social cohesion indicators).
- Higher rates of crime and conflict.
- Political polarisation.
- Lower civic participation.
These reduce the effectiveness of institutions and the productivity of the economy.
Impact on intergenerational equity
The 2023 Productivity Commission Wealth of Generations report documents:
- Older households are dramatically wealthier than at the same age 20 years ago.
- Younger households are less wealthy and face higher housing costs.
- Home ownership rates among under-35s have fallen from over 50 percent in the 1980s to around 35 percent.
The drivers include:
- Housing price growth far exceeding wage growth.
- Tax preferences for housing (CGT discount, negative gearing).
- Rising student debt.
- Insecure work in entry-level service jobs.
Policy responses (partial):
- Housing Accord targets (1.2 million new homes by 2029).
- Help to Buy shared equity scheme.
- Stage 3 tax cuts recalibrated.
- Compulsory super at 12 percent from 2025.
- Free TAFE for skills entry.
Impact on macroeconomic objectives
- Growth
- High inequality may reduce long-run growth through lower social mobility and lower demand growth.
- Full employment
- Long-term unemployed face poverty traps that perpetuate inequality.
- Inflation
- Stronger wage growth for lower-income workers (minimum wage rises) supports demand but can add to wage pressure.
- Environmental sustainability
- Higher-income households have larger carbon footprints; equitable transition policy is needed.
Common QCE traps
- Confusing income with wealth
- Always specify which.
- Drawing the Lorenz curve incorrectly
- Horizontal axis: cumulative population (poorest first). Vertical axis: cumulative income share. Both 0 to 100 percent.
- Forgetting the redistributive effect of the tax-transfer system
- Australia is highly redistributive by OECD standards. Markers reward responses that quantify the Gini reduction.
- Treating equity as separate from efficiency
- They interact: very high inequality can reduce growth and efficiency through social and economic channels.
Exam-style practice questions
Practice questions written in the style of QCAA exam questions on this dot point, with worked answer explainers. The year tag is the paper they imitate, not the source.
2023 QCAA13 marksSuperannuation is a percentage payment from current income by an employee, to save for a future income in retirement. Policy option 1: women given a five-year income tax discount to top up personal superannuation accounts. Policy option 2: a one-off taxation levy on low superannuation balances. Analyse the economic issue indicated in the data and economic information provided. Which policy option should the government implement to improve equity in economic prosperity for all Australians?Show worked answer →
This was Question 14 (13 marks) of the 2023 external assessment, marked on an analysing component and an evaluating (decision) component.
Analyse the issue. Identify the equity problem in the data: a large share of Australians retire with little or no superannuation, and the gap falls unevenly. Use the data to show women are over-represented among those without super, partly because they spend more time in part-time and casual work, so they accumulate smaller balances over a working life. Note that compulsory super (introduced in 1992) and compounding mean early contributions matter most, so those with broken or low-income work histories fall behind.
Decision on equity. Choose one option and justify it against the criterion of equity in economic prosperity. Option 1 (a tax incentive for women to top up super) targets the group most affected and lifts their retirement income, improving horizontal and intergenerational equity, though it costs revenue and benefits only those able to contribute more. Option 2 (a levy on low balances) raises revenue but worsens equity by taxing those already worst off.
A high-level response weighs both options with economic reasoning and reaches a clear, equity-based conclusion.