Distribution of Income and Wealth

Syllabus: Economic Issues → Distribution of income and wealth.

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Income and wealth are different things

Get this right first, because every other dot point in the section depends on it.

Income is a flow: money received over a period, whether wages, profit, rent, interest, dividends or transfer payments. Wealth is a stock: the value of assets held at a point in time, net of liabilities, so property, shares, superannuation and business assets.

The two interact, which is the important part. Income that is saved becomes wealth, and wealth generates income. That is why inequality compounds, because those who hold wealth earn income from it, and that income becomes more wealth.

In every economy, wealth is far more unequally distributed than income. Any response that treats the two as interchangeable loses marks.

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Measurement: the Lorenz curve and Gini coefficient

The Lorenz curve plots the cumulative percentage of income received against the cumulative percentage of households, ranked from lowest income to highest. The line of perfect equality is the 45° diagonal, where each 10% of households receives exactly 10% of income. The Lorenz curve bows below it, and the further it bows the more unequal the distribution. It can never sit above the diagonal.

The Gini coefficient turns that picture into one number:

Gini = area A ÷ (area A + area B)

A is the area between the line of equality and the curve, B the area beneath the curve. A Gini of 0 is perfect equality, where every household has identical income and A disappears. A Gini of 1 is perfect inequality, where one household has everything and B disappears.

Four limitations are examinable. A single number conceals the shape of the distribution, so two economies can share a Gini while the inequality sits in completely different places, one with extreme poverty and another with extreme concentration at the top. It measures relative rather than absolute position, so it says nothing about how poor the poor actually are. Lorenz curves for two economies can cross, in which case the Gini produces a ranking the underlying data does not support. And the figure depends heavily on whether the data is measured before or after tax and transfers, and on whether it counts individuals or households.

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Sources of income

Household income by factor of production breaks down into wages and salaries, the return to labour and by far the dominant source at typically 55 to 60%; profits, the return to entrepreneurship; rent, the return to land and property; interest and dividends, the return to capital; and transfer payments, which are not a return to any factor but a redistribution.

The composition matters more than the list suggests. Because wages dominate, employment status is the single largest determinant of where a household sits in the distribution. That is the link into unemployment: since unemployment is concentrated among lower-income groups, it directly worsens the distribution rather than merely coinciding with it.

Income from capital, meaning interest, dividends and rent, is far more concentrated at the top. That is why asset price booms widen inequality even when wages are perfectly stable.

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Taxation, transfer payments and other assistance

Government redistributes through both sides of the Budget, and the combined effect is substantial.

Taxation

Progressive taxation takes a higher proportion of income as income rises. Australia's personal income tax is progressive through its bracket structure and is the primary redistributive instrument. A proportional tax takes the same percentage regardless of income. A regressive tax takes a higher proportion from lower-income earners, and the GST is the standard illustration, because lower-income households spend a larger share of their income on consumption.

Bracket creep works against progressivity in real terms. Nominal wage rises push taxpayers into higher brackets without any rise in real income, which is an unlegislated tax increase, and it is why periodic tax cuts are partly just handing back what bracket creep took.

Transfer payments

Direct payments: the Age Pension, JobSeeker, the Disability Support Pension, Family Tax Benefit. Australia means-tests these, which makes the system unusually efficient at targeting. Australia achieves substantial redistribution with relatively modest spending compared with universal systems, and that efficiency is worth naming.

Other assistance

The social wage is government provision of health through Medicare, education and housing. It raises the real living standards of lower-income households without appearing as income at all, which means income data on its own understates how much redistribution is happening.

Superannuation tax concessions run the other way, since the benefit rises with income, making them regressive in effect. Minimum wages and industrial relations settings also shape the distribution before tax touches it.

Taken together, the system substantially reduces inequality. The Gini for final income, after tax, transfers and the social wage, is markedly lower than for private income. Making that before-and-after comparison explicitly is what a strong answer does.

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Sources of wealth

Owner-occupied housing is the largest single component of household wealth for most Australians, with investment property a major source of concentration. Superannuation is now a very large share. Then shares and other financial assets, business assets, and inheritance, which is the intergenerational transmission mechanism and a major reason wealth inequality persists across generations.

Wealth inequality exceeds income inequality for three reasons working together. Wealth accumulates across a lifetime and then across generations, it generates further income, and asset price growth compounds whatever is already held. Housing sits at the centre of it in Australia, because rising house prices increase the wealth of owners and raise the barrier for non-owners in the same movement.

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Dimensions and trends

The syllabus names these explicitly. Give each one a mechanism rather than just asserting that a gap exists.

Gender. Women have lower average earnings and substantially lower superannuation balances at retirement. The drivers are occupational segregation into lower-paid industries, higher rates of part-time work, and career interruption for caring responsibilities, which compounds through the superannuation contributions never made.

Age. Income follows a life-cycle pattern, low when young, peaking in middle age and falling in retirement. Wealth does something different, rising with age and peaking near retirement. So the young have low income and low wealth, while retirees have low income and high wealth. Cross-sectional inequality therefore partly reflects people standing at different points in a life rather than permanent differences between them.

Occupation. Reflects skill, education and bargaining power. The gap between high-skill and low-skill occupations has widened with technological change, which raises demand for skilled labour while reducing it for routine work.

Ethnic background. Indigenous Australians experience substantially lower incomes, employment rates and life expectancy. Recent migrants often face lower earnings initially, particularly where their qualifications are not recognised here.

Family structure. Single-parent and single-income households have markedly lower incomes than dual-income households. Household size affects how the data reads, which is why economists work with equivalised household income.

On trends, Australian inequality is moderate by OECD standards and well below the United States, but it has generally widened over recent decades, and wealth inequality has widened faster than income inequality, driven substantially by housing.

One current data point is worth deploying. Wage growth of 3.3% to the March quarter 2026 against headline inflation of 4.6% means real wages fell. Since wages are the dominant income source for lower and middle-income households while asset income concentrates at the top, falling real wages alongside rising asset prices widens the distribution from both ends at once.

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Economic and social costs and benefits of inequality

The case that some inequality is efficient

If effort and risk are not rewarded differentially, the incentive to undertake them weakens. The same logic applies to skills: the return to human capital is the wage premium, so flattening the premium flattens the incentive to acquire the skill. Inequality rewards entrepreneurship and risk-taking, which drive innovation. Higher-income households save a larger proportion of income, potentially raising the capital stock. And wage differentials draw labour towards where it is most valued, which is an allocation mechanism, not just a distributional outcome.

Economic costs

Reduced aggregate demand is the first and the most concrete. Lower-income households have a higher marginal propensity to consume, so redistributing income upwards lowers total consumption and weakens growth. That is a mechanism rather than a moral claim, and stating it that way matters.

Beyond that: underinvestment in human capital where able people cannot afford education, which is a direct loss of productive capacity; reduced social mobility, so talent is misallocated across generations; a higher fiscal burden of welfare and health spending; and poverty traps, where high effective marginal tax rates from withdrawn benefits discourage additional work.

Social costs

Poorer health outcomes and lower life expectancy at the bottom of the distribution, higher crime rates, reduced social cohesion and trust, political instability and polarisation, and disadvantage that transmits between generations.

The judgement

The economic question is not whether inequality should exist but how much of it, and of what kind. Inequality arising from differential effort and skill acquisition has an efficiency justification behind it. Inequality arising from inheritance, discrimination or unequal access to education has none, and it imposes real efficiency costs by misallocating talent that would otherwise be used.

Distinguishing inequality of outcome from inequality of opportunity is what separates an evaluative answer from a list of effects.

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What the exam does with this

Inequality carried Section III in 2025, Section IV in 2019, and Section II in 2023.

On the 2025 question the examiners reported that responses over-relied on the stimulus, narrating the data provided instead of arguing with it.

Five things to get right.

Draw and label the Lorenz curve properly: cumulative percentage of households on the horizontal, cumulative percentage of income on the vertical, both areas marked, and the Gini formula stated.

Keep income and wealth distinct throughout, and say explicitly that wealth is the more unequally distributed of the two.

Use the before-and-after tax and transfer comparison. It is the clearest evidence of policy effectiveness available anywhere in the topic.

Give each dimension a mechanism rather than a statement that a gap exists.

Argue both costs and benefits. The incentive argument is a real economic argument, and a response that ignores it is not evaluating.

Related notes: Unemployment · Fiscal policy · Conflicts between economic objectives · The diagram guide