Worked Solutions
Topic 1: The Global Economy — Worked Solutions (HSC Economics)
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Worked examples for HSC Economics Topic 1: The Global Economy. Each shows where the marks are awarded, the key idea, and the full solution explained by your choice of tutor — Stella, Ella or Cassie.
How to use these
Try each question first, then check your working against the model answer. Use the tutor tabs to read the response in the style that suits you: Stella is direct and challenging, Ella is warm and explains the why, and Cassie is concise and analytical. Pay attention to the marking guide — extended responses are marked against content criteria, so each mark needs a distinct, developed point.
Example 1 — Measuring development
Question
Explain why the Human Development Index (HDI) may provide a more complete measure of economic development than Gross Domestic Product (GDP) per capita.
Solution
GDP per capita measures only the average value of output produced per person — it tells you about income, not living standards.
HDI is a composite index: it combines real GNI per capita (PPP) with life expectancy at birth and education (mean and expected years of schooling). So it captures health and knowledge, not just money.
That matters because two countries with similar GDP per capita can have very different outcomes. A country that spends its income on health and education will score higher on HDI than one with the same income but high inequality and poor public services.
HDI also reflects distribution better — GDP per capita is just an average and hides inequality, whereas longer life expectancy and higher schooling tend to require broad-based access. So HDI is a more complete measure of development as a multidimensional concept.
Let's start with the difference between growth and development. Economic growth is just an increase in output, usually measured by GDP per capita. Development is broader — it's about improvements in wellbeing and quality of life.
GDP per capita is the total value of goods and services produced, divided by population. It's a useful income measure, but it's silent on how people actually live. It doesn't tell you whether they're healthy, educated, or whether the income is shared fairly.
The HDI was designed to fix this. It blends three dimensions: a long and healthy life (life expectancy), knowledge (years of schooling), and a decent standard of living (real GNI per capita, adjusted for purchasing power). By combining income with health and education, it gives a fuller picture of development.
Here's why that's more complete: a high-income oil economy might have strong GDP per capita but weak schooling, while another country with the same income invests heavily in its people. HDI distinguishes them; GDP per capita can't. So HDI captures development as a multidimensional outcome, not just an income figure.
GDP per capita:
- Output value per person → income/growth measure
- An average → hides inequality
- Ignores health, education, quality of life
HDI (composite index):
- Real GNI per capita (PPP) → standard of living
- Life expectancy → health
- Schooling years → education
More complete because:
- Captures development as multidimensional, not just income
- Distinguishes countries with equal income but different wellbeing
- Reflects how income is used (services), not just how much there is
Where the marks go
- 1 mark: Identifies that GDP per capita measures income/output only (and is an average)
- 1 mark: Identifies the components of HDI (income, health/life expectancy, education)
- 2 marks: Explains, with reasoning, why combining these dimensions makes HDI a more complete measure of development
Key idea
Growth (GDP per capita) measures income; development (HDI) is multidimensional, adding health and education to income.
Example 2 — Trade and globalisation
Question
Analyse the impact of increased trade flows on economic growth and the distribution of income within an economy.
Solution
Increased trade flows mean an economy exports and imports more — it specialises according to comparative advantage and accesses larger markets.
Impact on growth: trade lifts growth. Exporting to world markets raises aggregate demand (X is a component of AD), and specialisation raises productivity and efficiency. Cheaper imported inputs and capital goods lower costs and lift potential output. Greater competition and technology transfer also drive innovation. So trade openness is generally growth-positive.
Impact on income distribution: the gains are uneven. Export and high-skill industries expand and their workers gain, but import-competing industries (e.g. low-skill manufacturing) contract, causing structural unemployment and falling relative wages for those workers. So trade can widen income inequality within an economy even as it raises average income.
Conclusion: trade tends to raise the size of the pie (growth) but can change how it's sliced (distribution), which is why governments use retraining, social welfare and structural adjustment policies to share the gains.
Let's unpack what "increased trade flows" does. When an economy trades more, it specialises in what it produces relatively efficiently (comparative advantage) and sells into much larger global markets — and it imports the things others make better or cheaper.
Think first about growth. Exports are part of aggregate demand, so rising exports directly add to economic activity. Beyond that, specialisation lifts productivity, access to cheaper imported inputs and capital lowers business costs, and exposure to global competition pushes firms to innovate and adopt new technology. All of these expand the economy's productive capacity, so trade generally raises economic growth.
Now think about who benefits — the distribution question. The gains aren't shared evenly. Workers and firms in competitive export industries do well, but those in industries that now compete with cheaper imports may lose their jobs (structural unemployment) and see wages fall. Higher-skilled workers tend to gain relative to lower-skilled ones. So while average incomes rise, the gap between winners and losers can widen.
That's the key tension: trade can grow the overall pie while making its distribution more unequal. This is exactly why governments pair trade liberalisation with retraining, welfare and structural adjustment support — to spread the benefits.
Increased trade = more X and M, specialisation by comparative advantage.
Growth (positive):
- X is a component of AD → higher exports lift growth
- Specialisation → higher productivity/efficiency
- Cheaper imported inputs/capital → lower costs, higher potential output
- Competition + technology transfer → innovation
Distribution (uneven):
- Export/high-skill industries and workers gain
- Import-competing/low-skill industries contract → structural unemployment, lower relative wages
- Inequality can widen even as average income rises
Conclusion: trade enlarges the pie (growth) but can skew the slices (distribution); offset with retraining/welfare/structural adjustment.
Where the marks go
- 2 marks: Analyses how increased trade flows raise economic growth (e.g. exports as AD, specialisation, productivity, lower costs)
- 2 marks: Analyses the distributional impact (gains to export/high-skill sectors, losses to import-competing/low-skill sectors, structural unemployment)
- 1 mark: Draws the link/conclusion that trade can raise average income while widening inequality
Key idea
Trade lifts growth through specialisation and larger markets, but its gains are uneven, so it can widen income inequality within an economy.