HSC Economics — Topic 3
Income Distribution — Flashcards & Quiz
Income distribution is the equity dimension of HSC Economics Topic 3: Economic Issues. You need to interpret the Lorenz curve and Gini coefficient, identify sources of inequality (skills, age, gender, location, capital ownership), and weigh the equity-efficiency trade-off when discussing redistributive policy. Strong responses link Australia's relatively progressive tax-transfer system to outcomes, and contrast it with countries at higher or lower Gini values. Quote actual Gini values where you can — they signal exam fluency.
Key Points
- Income distribution measures how income is shared across a population. Australia uses the Lorenz curve and Gini coefficient.
- Lorenz curve plots cumulative % of income against cumulative % of population; the further from the diagonal, the more unequal.
- Gini coefficient: 0 = perfect equality, 1 = perfect inequality. Australia sits around 0.32-0.34 (middle of OECD).
- Sources of inequality: skills/education gaps, age profile, capital ownership, location, labour market outcomes, discrimination.
- Redistribution tools: progressive income tax, welfare transfers, public service provision (health, education), minimum wage.
- Equity-efficiency trade-off: redistribution can reduce work incentives (high marginal tax rates) but also fund productivity-enhancing services. No free lunch.
Common Mistakes to Avoid
- Confusing the Lorenz curve (graphical) with the Gini coefficient (numerical).
- Claiming Gini = 0 is ideal — it means perfect equality, which few economists advocate as optimal.
- Ignoring the equity-efficiency trade-off.
- Listing sources of inequality without linking to policy responses.
- Mixing up market income distribution with after-tax-and-transfer distribution.
Exam Strategy
HSC Topic 3 income distribution questions are evaluative. Structure: (1) define the measure (Lorenz/Gini), (2) identify sources of inequality (skills, age, location, capital), (3) discuss redistribution tools (progressive tax, welfare, services), (4) evaluate the equity-efficiency trade-off. Australian Gini data (~0.32-0.34) provides concrete context.
Sample Flashcards
Q1: How is income inequality measured and what is the Gini coefficient?
Income inequality measures how evenly income is distributed across a population. The Gini coefficient is the most common measure, ranging from 0 (perfect equality: everyone has same income) to 1 (perfect inequality: one person has all income). Australia's Gini coefficient for disposable income (after taxes and transfers) is around 0.32–0.33, indicating moderate inequality. Other measures include: income quintiles (dividing population into five 20% groups), the 90/10 ratio (comparing top 10% to bottom 10%), and poverty rates (proportion below 50% of median income). Wealth inequality (assets minus debts) is typically higher than income inequality.
Q2: What factors contribute to income inequality in Australia?
Key factors include: differences in education and skills (tertiary-educated earn 50-80% more than non-graduates); occupational differences (executives vs low-skill workers); age and experience (earnings peak at 45-54); industry variations (mining/finance pay more than retail/hospitality); globalisation and technological change (increasing returns to skills while displacing low-skill jobs); decline in union coverage reducing worker bargaining power; casualisation and underemployment; discrimination based on gender, ethnicity, or age; inheritance and intergenerational wealth transfers; and geographic location (capital cities vs regional areas). Government policy, including progressive taxation and welfare systems, moderates but does not eliminate these inequalities.
Q3: What are the economic and social impacts of income inequality?
Economic impacts of high inequality include: reduced aggregate demand and growth (low-income earners have higher propensity to consume); inefficient human capital allocation (talented poor unable to afford education); reduced social mobility across generations; increased household debt as low-income earners borrow to maintain living standards; and potential financial instability. Social impacts include: increased poverty and social exclusion; poorer health and education outcomes for disadvantaged groups; higher crime rates and reduced social cohesion; political instability and populism; reduced equality of opportunity contradicting meritocracy principles. However, some inequality provides incentives for effort, risk-taking, and innovation.
Sample Quiz Questions
Q1: A Gini coefficient of 0 represents perfect income equality where everyone has the same income.
Answer: TRUE
The Gini coefficient ranges from 0 (perfect equality) to 1 (perfect inequality where one person has all income). Australia's coefficient of approximately 0.33 indicates moderate inequality, between Nordic countries (~0.25) and USA (~0.40).
Q2: Wealth inequality in Australia is typically lower than income inequality.
Answer: FALSE
Wealth inequality (distribution of assets minus debts) is significantly higher than income inequality in Australia. While income Gini is ~0.33, wealth concentration is much greater: top 20% own 62% of wealth, while bottom 20% own just 1%, reflecting property ownership concentration and intergenerational transfers.
Q3: Progressive taxation and welfare transfers reduce income inequality in Australia.
Answer: TRUE
Australia's tax-transfer system redistributes income from high to low earners. The Gini coefficient for market income (before taxes and transfers) is much higher than the Gini coefficient for disposable income (around 0.33), demonstrating a significant redistribution effect.
Revision Tip
Inequality sources and responses match up in pairs — drill a Revizi deck that pairs each source with at least one redistribution tool.
Related Concepts
Last updated: 9 October 2026 · 3 sample flashcards · 3 sample quiz questions