What are the major economic issues for the Australian economy and how are they measured?
Examine the issue of distribution of income and wealth in Australia including the measurement of inequality, the Lorenz curve and the Gini coefficient, dimensions and trends in inequality, and the economic and social impacts of inequality
A focused HSC Economics Topic 3 answer on inequality. Distinguishes income from wealth, draws and reads the Lorenz curve, defines the Gini coefficient, identifies the sources of inequality in Australia, and analyses recent ABS Survey of Income and Housing trends.
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What this dot point is asking
NESA wants you to distinguish income from wealth, explain the Lorenz curve and Gini coefficient, describe the dimensions of inequality in Australia, identify the sources, and analyse the economic and social impacts. Expect a 5 to 7 mark short answer requiring a Lorenz curve diagram.
The answer
Income vs wealth
Income is a flow concept: payments received over a period of time (wages, salaries, profits, dividends, interest, rents, government transfers).
Wealth is a stock concept: the value of assets owned (housing, superannuation, shares, businesses) less liabilities (mortgages, credit card debt).
The two are related but not identical: a retiree may have substantial wealth (a house, super balance) but low current income. A young high-earner may have high income but little accumulated wealth.
Australia (and most countries) has much 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).
Measurement: the Lorenz curve
The Lorenz curve plots cumulative income share against cumulative population share, ranked from lowest to highest income.
The 45 degree line represents perfect equality (the bottom 10 percent of households earn 10 percent of income, etc.). The actual Lorenz curve bows below the diagonal; the further from the diagonal, the greater the inequality.
The Gini coefficient
The Gini coefficient is the area between the Lorenz curve and the 45 degree line, divided by the total area below the 45 degree line.
Gini ranges from 0 (perfect equality) to 1 (perfect inequality, where one household has all income).
International comparison (2024 indicative, OECD/World Bank):
| Country | Gini coefficient (after tax) |
|---|---|
| Slovakia, Norway, Denmark | 0.25 |
| Sweden, Germany, France | 0.28 to 0.30 |
| Australia | 0.32 |
| United Kingdom | 0.35 |
| United States | 0.41 |
| South Africa | 0.63 |
Australia's Gini sits roughly in the middle of OECD countries. It is around 0.32 after tax and transfers (ABS Survey of Income and Housing, latest release).
Income inequality in Australia
The ABS Survey of Income and Housing (cat. no. 6523.0) is the canonical source. Indicative figures (using 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 of households earn about 5.7 times the average disposable income of the bottom 20 percent.
Wealth inequality
Wealth is much more unequally distributed:
| Quintile | Share of household 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 all wealth (Productivity Commission). Housing is the largest single asset for most Australians and the largest source of wealth inequality.
Sources of inequality
- 1. Employment status
- Employment is the single biggest determinant. Households where no adult is employed have far lower incomes than dual-earner households.
- 2. Hours worked
- The rise of part-time and casual employment, especially among women, contributes to household-level inequality.
- 3. Education and skills
- University graduates earn around 70 percent more over their working lives than those with year 12 only (Grattan Institute).
- 4. Occupation and industry
- Finance, mining and ICT pay well above the average; retail, hospitality and personal care pay below.
- 5. Capital and asset returns
- Capital gains from housing and equities accrue disproportionately to those who already own assets.
- 6. Geography
- Sydney and Melbourne earnings are 15 to 20 percent above the national average; remote and regional areas earn below.
- 7. Demographic factors
- Indigenous Australians, recent migrants and people with disability have substantially lower median incomes.
- 8. Tax and transfer system
- Progressive income tax and means-tested transfers (Age Pension, JobSeeker, Family Tax Benefit) reduce the Gini from around 0.45 (market income) to around 0.32 (disposable income). One of the most redistributive systems in the OECD.
Trends
Australian income inequality has been relatively stable over the past two decades (Gini 0.32 to 0.34), in contrast to the US (rising) and many European economies. However:
- Wealth inequality has risen. Housing price gains have benefited existing homeowners (older, wealthier) at the expense of renters (younger, lower-wealth).
- Intergenerational inequality has widened. Younger cohorts hold lower wealth and face higher housing costs than at the same age 20 years ago (Productivity Commission, Wealth of Generations 2023).
- The gender pay gap is around 13 percent (WGEA 2024), down from around 17 percent a decade ago.
- Indigenous gap. Indigenous median household income is around 60 percent of non-Indigenous (AIHW).
Economic impacts of inequality
Negative:
- Lower aggregate demand growth. Lower-income households have a higher marginal propensity to consume. Redistribution upward reduces total consumption.
- Lower social mobility. High inequality reduces equality of opportunity, dragging on long-run growth (OECD, "Divided We Stand" 2011, 2015 updates).
- Lower human capital investment. Children from low-income households face worse educational and health outcomes.
- Financial instability. High inequality is associated with rising household debt as middle-income groups borrow to maintain consumption (BIS research).
Positive (in moderation):
- Incentives for skill acquisition. Returns to education and effort encourage human capital investment.
- Incentives for risk-taking. Returns to entrepreneurship encourage innovation.
- Capital accumulation. Wealth inequality can mean concentrated savings available for investment.
Social impacts of inequality
- Poverty. Around 13 percent of Australians live in relative poverty (less than 50 percent of median income; ACOSS/UNSW Poverty in Australia report).
- Health inequalities. Life expectancy gap of around 6 years between the highest and lowest socioeconomic quintiles (AIHW).
- Education inequalities. University attendance rates differ sharply between low-SES and high-SES areas.
- Housing stress. Around 30 percent of low-income renters are in rental stress (paying more than 30 percent of income on rent).
- Social cohesion. Higher inequality is associated with lower social trust and political polarisation.
Government redistribution
Australia's tax-transfer system is among the most redistributive in the OECD:
- Progressive income tax with rates from 0 to 47 percent (including Medicare levy).
- Means-tested transfers: Age Pension, JobSeeker, Disability Support Pension, Family Tax Benefit.
- Free or subsidised services: Medicare, public schools, public housing.
- Compulsory superannuation: 12 percent of wages from 1 July 2025.
These reduce the Gini coefficient by around 0.13 (from market-income Gini of 0.45 to disposable-income Gini of 0.32).
Common HSC traps
- Confusing income with wealth
- Always specify which.
- Drawing the Lorenz curve incorrectly
- The horizontal axis is cumulative population (poorest first); the vertical axis is cumulative income share. Both axes run from 0 to 100 percent.
- Forgetting that Australia is moderately equal by OECD standards
- Many students assume Australia is highly unequal; in fact the tax-transfer system substantially reduces market-income inequality.
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