QCE Economics practice questions: combination-response and extended-response with model answers
A QCE Economics practice set in QCAA combination-response and extended-response style. Worked short-response and stimulus-based extended-response items across Units 3 and 4, with model answers, a marking-criteria walkthrough, and a paired quiz to test recall.
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How to use this practice set
This page is exam practice in QCAA combination-response and extended-response style. The QCE Economics external assessment is a 60-mark combined-response paper over 120 minutes (2 hours) working time (plus 15 minutes planning), cumulative across Unit 3 (International economics) and Unit 4 (Contemporary macroeconomics). It mixes multiple choice, short response, and a stimulus-based extended response. The internal assessments (IA1 examination, IA2 and IA3 investigations) draw on the same skills.
Work each item under timed conditions before reading the model answer. The model answers show the cause-and-effect chains and the data integration that QCAA criteria reward. If you need to revise the underlying theory first, read the markets deep-dive and the macro and international deep-dive.
Exam tip
Before writing any extended response, spend two minutes planning a cause-and-effect chain and noting the data you will cite. Markers reward sustained analysis with a clear logical thread, not a list of facts. A planned response of moderate length beats a long, unstructured one.
Section A: short-response practice (Units 1 to 2 foundation)
- Q1 (4 marks)
- Distinguish between a movement along a demand curve and a shift of a demand curve, giving one cause of each.
- Q2 (5 marks)
- A 20 percent rise in the price of a good causes quantity demanded to fall by 8 percent. (a) Calculate the price elasticity of demand. (b) State whether demand is elastic or inelastic. (c) Explain what happens to the firm's total revenue if it raises this price.
- Q3 (6 marks)
- Using a negative externality diagram, explain why a competitive market over-produces a polluting good, and explain how an indirect tax corrects the over-production.
Section B: short-response practice (Unit 3 international economics)
- Q4 (5 marks)
- Country A produces 10 units of steel or 5 units of wheat per labour unit. Country B produces 4 units of steel or 8 units of wheat per labour unit. Identify which country has the comparative advantage in each good and state the range of mutually beneficial trade ratios.
- Q5 (6 marks)
- Using a tariff diagram, explain the effects of an import tariff on consumers, producers, government revenue and total welfare.
- Q6 (5 marks)
- Explain, using a foreign exchange market diagram, how a rise in Australian interest rates relative to overseas affects the value of the AUD.
Section C: stimulus-based extended response
Q7 (12 marks). Stimulus: the AUD/USD fell from around 0.78 in early 2021 to around 0.62 by late 2024, while Australia's current account moved from a surplus near 4 percent of GDP in 2021-22 toward a small balance by 2024.
Analyse how a depreciation of the Australian dollar affects the balance of payments. Refer to the stimulus and to relevant economic theory.
Q8 (12 marks). Analyse the use of monetary policy and fiscal policy to manage inflation in Australia, referring to the 2022 to 2024 disinflation episode. Evaluate the effectiveness of the policy mix.
Model answers
Solutions
- Q1
- A movement along a demand curve is caused only by a change in the good's own price, with all other factors held constant; for example, a fall in the price of coffee raises the quantity of coffee demanded along the curve. A shift of the demand curve is caused by a change in a non-price determinant; for example, a rise in household income shifts the demand curve for a normal good to the right, raising quantity demanded at every price. Markers reward an explicit statement of which factor changed and which response (movement versus shift) it produces.
- Q2
- (a) . (b) Because PED is less than 1, demand is inelastic. (c) If the firm raises this price, total revenue rises: because demand is inelastic, the percentage fall in quantity (8 percent) is smaller than the percentage rise in price (20 percent), so price times quantity increases. Firms facing inelastic demand can raise price to lift revenue.
- Q3
- A polluting good has a social marginal cost above its private marginal cost, because the producer does not pay for the pollution imposed on third parties. The competitive market produces where demand meets private marginal cost, at quantity Qm. The socially optimal quantity Q* is where demand meets social marginal cost, which is lower, so the market over-produces by (Qm minus Q*). The deadweight loss is the triangle between the SMC and PMC curves over that range. An indirect (Pigouvian) tax equal to the marginal external cost raises the producer's private cost up to the social cost, shifting the private supply curve left until it coincides with SMC. The new equilibrium is at Q*, internalising the externality, removing the deadweight loss and raising revenue. A correct diagram labels demand, PMC, SMC, Qm, Q* and the deadweight-loss triangle.
- Q4
- In Country A the opportunity cost of one steel is 0.5 wheat (5/10), so one wheat costs 2 steel. In Country B the opportunity cost of one steel is 2 wheat (8/4), so one wheat costs 0.5 steel. Country A has the comparative advantage in steel (0.5 wheat versus 2 wheat) and Country B in wheat (0.5 steel versus 2 steel). Mutually beneficial trade requires a price of steel between 0.5 and 2 wheat per steel (equivalently, a price of wheat between 0.5 and 2 steel per wheat). Each country specialises in its comparative-advantage good and both consume beyond their autarky possibilities.
- Q5
- A tariff raises the domestic price above the world price by the tariff amount. Consumers lose surplus (the trapezoid under the demand curve between the two prices) and reduce consumption. Producers gain surplus (the rectangle from the price rise over domestic output) and expand output. Government gains revenue equal to the tariff multiplied by the remaining imports. Total welfare falls by the deadweight loss: a production-distortion triangle (high-cost domestic output replacing cheaper imports) plus a consumption-distortion triangle (lost surplus from reduced consumption). A correct diagram labels domestic demand and supply, the world price line, the higher tariff-inclusive price, the four areas, and both deadweight-loss triangles.
- Q6
- A rise in Australian interest rates relative to overseas widens the interest rate differential in Australia's favour, making Australian assets more attractive to foreign investors. Foreign portfolio and direct investors need AUD to buy these assets, so the demand for AUD shifts right from D1 to D2 (and Australians have less incentive to invest abroad, reducing supply). On the foreign exchange diagram, with USD per AUD on the vertical axis and quantity of AUD on the horizontal axis, the market moves to a new equilibrium at a higher exchange rate: the AUD appreciates. This is the exchange rate channel of monetary policy in action.
- Q7
- A depreciation is a fall in the AUD's price in foreign currency, as shown in the stimulus where the AUD/USD fell from about 0.78 (early 2021) to about 0.62 (late 2024), a depreciation of roughly 20 percent.
- Effect on the current account
- A depreciation makes Australian exports more competitive in foreign-currency terms, so export volumes tend to rise, and makes imports more expensive in AUD, so import volumes tend to fall. Net exports and the balance on goods and services therefore improve, subject to the Marshall-Lerner condition (the sum of export and import price elasticities must exceed 1, which holds for Australia). However, the net primary income deficit worsens, because servicing Australia's foreign-currency liabilities costs more in AUD terms; this is significant given Australia's persistent net primary income deficit of around 4 percent of GDP.
- The J-curve
- In the short run the balance on goods and services may deteriorate because import prices rise immediately in AUD terms while volumes adjust slowly (contracts, brand loyalty, search costs). Over roughly 6 to 12 months volumes adjust and the balance improves, tracing a J-shape. The stimulus is consistent with a current account that softened from its 2021-22 surplus partly as commodity prices eased, even as the lower AUD supported export competitiveness.
- Effect on the capital and financial account
- Because CA + KAFA = 0, any change in the current account is mirrored in the capital and financial account. A cheaper AUD can attract foreign investment into now-cheaper Australian assets over the medium term, raising net capital inflow.
- Judgement
- Over the medium term a depreciation tends to improve the balance on goods and services (after the J-curve, given Marshall-Lerner), while raising the net primary income deficit and imported inflation. The stimulus period combined a large depreciation with a current account that moved off its peak surplus, reflecting easing commodity prices rather than the depreciation alone. A full-mark response quotes the stimulus figures, states the cause-and-effect chain, names the J-curve and Marshall-Lerner condition, and reaches a supported conclusion.
- Q8
- Inflation is reduced by lowering aggregate demand relative to supply so that capacity pressure eases.
- Monetary policy
- The RBA raises the cash rate, transmitting through four channels: the interest rate channel (higher loan rates cut consumption and investment), the asset price channel (lower housing and equity prices cut wealth and consumption), the exchange rate channel (capital inflow appreciates the AUD, lowering imported inflation), and the expectations channel (forward guidance anchors inflation expectations). In 2022 to 2024 the cash rate rose from 0.10 percent (May 2022) to 4.35 percent (November 2023), the fastest tightening in three decades; trimmed mean CPI fell from 6.9 percent (Q4 2022) toward about 3.2 percent (Q4 2024), while unemployment rose modestly toward about 4.1 percent and growth slowed, illustrating the short-run Phillips curve trade-off. Monetary policy's strengths are flexibility and independence; its weaknesses are the 12-to-18-month lag and a blunt, distributionally uneven impact on mortgage holders.
- Fiscal policy
- Contractionary fiscal policy raises taxes or cuts spending, lowering disposable income and government demand. Over this period the Budget moved into surplus, tightening the structural balance and reinforcing the RBA rather than adding to demand. Fiscal policy's strengths are direct, targeted demand effects and distributional tools; its weaknesses are legislative lags and political constraints.
- Evaluation of the policy mix
- The coordinated tightening, supported by the 2023 Statement on the Conduct of Monetary Policy and eased labour-supply pressure from strong migration, was more effective than monetary policy alone because the two arms did not work at cross-purposes. The mix brought inflation back toward the 2 to 3 percent target while limiting the rise in unemployment. On balance it was effective given the scale of the initial shock, though monetary policy carried most of the burden and most of the distributional cost. A full-mark response gives the mechanism of both policies, all four monetary channels, specific 2022 to 2024 figures, and a justified judgement.
Mapping answers to QCAA criteria
QCAA Economics assessment rewards three things consistently across IA and EA marking guides:
- Comprehension and analysis. A correct, sequenced cause-and-effect chain, with the right diagram, earns the analysis marks. State each step rather than jumping to the conclusion.
- Use of evidence and stimulus. Quote a figure from the stimulus or your data card, interpret it, and link it to the theory. Generic answers that ignore the stimulus cap out below the top band.
- Synthesis and evaluation. For "analyse" and "evaluate" prompts, integrate multiple concepts and reach a justified judgement that weighs both sides. A list of correct facts without a judgement does not reach the top band on the longer items.
Key fact
The single most reliable way to move up a band on an extended response is to integrate recent Australian data into the analysis and reach a justified judgement. Always use the latest ABS and RBA releases rather than a memorised figure that may be stale.
Check your knowledge
Quick-recall items to consolidate the practice above. Attempt all, then check the solutions block, and use the paired quiz for timed multiple-choice practice.
- State the formula for price elasticity of demand and explain how to interpret a value greater than 1. (3 marks)
- State the balance of payments identity and explain what it implies for a country running a current account deficit. (3 marks)
- Define the Marshall-Lerner condition and explain its role in the J-curve. (4 marks)
- List the four channels of the monetary policy transmission mechanism. (4 marks)
- Explain the difference between automatic stabilisers and discretionary fiscal policy. (4 marks)
- Explain why a stimulus-based response that ignores the stimulus loses marks. (3 marks)
- Identify the two deadweight-loss triangles on a tariff diagram and explain what each represents. (4 marks)
- Explain what "evaluate" requires in a QCE Economics extended response, and how it differs from "explain". (4 marks)
Solutions
- Q1
- , reported as an absolute value. A value greater than 1 is elastic: quantity demanded is highly responsive to price, so a price rise causes a more than proportional fall in quantity and total revenue falls (and a price cut raises total revenue).
- Q2
- The identity is CA + KAFA = 0 (plus a statistical discrepancy), where CA is the current account and KAFA is the capital and financial account. It implies that a country running a current account deficit must be running a capital and financial account surplus of equal size: the deficit is financed by net capital inflow (foreigners acquiring domestic assets).
- Q3
- The Marshall-Lerner condition states that a depreciation improves the balance on goods and services only if the sum of the price elasticities of demand for exports and imports exceeds 1. It explains the J-curve: in the short run, when volumes are inelastic and have not yet adjusted, the condition may not hold, so the balance worsens; once enough time passes for volumes to respond (and the condition holds), the balance improves, tracing a J-shape. For Australia the condition holds.
- Q4
- The interest rate channel, the asset price channel, the exchange rate channel, and the expectations channel.
- Q5
- Automatic stabilisers dampen the business cycle without any active decision: in an expansion, income tax revenue rises faster than GDP and transfer payments fall, while in a downturn revenue falls and transfers rise. Discretionary fiscal policy requires deliberate legislated changes to taxes or spending, such as a stimulus package or new tax cuts. Stabilisers act automatically and quickly; discretionary policy is subject to decision and implementation lags.
- Q6
- A stimulus-based item is designed to test application of theory to the specific data provided. A response that ignores the stimulus and writes a generic textbook answer fails to demonstrate that application: it does not quote or interpret the given figures, so it cannot reach the analysis and evidence marks that the item allocates to using the stimulus, and it is capped below the top band.
- Q7
- The two triangles are the production-distortion triangle (representing the welfare cost of domestic firms producing extra output at a higher cost than the imports it replaces) and the consumption-distortion triangle (representing the lost consumer surplus from the reduction in total consumption caused by the higher price). Together they are the deadweight loss, the net welfare cost of the tariff after accounting for the transfers to producers and government.
- Q8
- "Evaluate" requires a judgement: the response must weigh strengths against weaknesses, or benefits against costs, and reach a justified conclusion supported by analysis and evidence. "Explain" requires only a clear cause-and-effect account of how or why something happens, without a judgement. An evaluate response that merely explains both sides without reaching and justifying a conclusion will not reach the top band.