2023 CCEA AS-Level Economics 4410 模擬試題連答案詳解

A free good is a good that is not scarce — it exists in unlimited supply relative to demand, so obtaining it involves no opportunity cost (nobody has to give up production of something else to provide it); an example is fresh air (in most locations) or sunlight. An economic good is a good that is scarce relative to the demand for it — resources must be used to produce it, so producing more of it involves an opportunity cost (giving up the production of some other good); an example is bread, which requires land, labour and capital to produce, all of which have alternative uses.

[1] correct definition of a free good (unlimited supply/no opportunity cost); [1] valid example of a free good; [1] correct definition of an economic good (scarce/has an opportunity cost); [1] valid example of an economic good; [1] clear explicit statement of the key distinguishing difference (presence/absence of opportunity cost) between the two. All other valid examples credited.

A production possibility frontier (PPF) shows the maximum combinations of two goods (or categories of goods) an economy can produce with its existing resources and technology, fully and efficiently employed. Productive efficiency refers to a single point ON the PPF itself (rather than a point inside it) — it means the economy is using its existing resources fully and without waste, so it cannot produce more of one good without producing less of the other; a point inside the PPF would represent productive inefficiency (unemployed or underused resources). Economic growth, by contrast, refers to an outward shift of the ENTIRE PPF — an increase in the economy's maximum possible output of both goods, caused by an increase in the quantity or quality of resources available (e.g. more capital, a larger labour force, or improved technology), rather than simply moving to a different point on the existing frontier.

[1] correct description of a PPF (maximum combinations of output with existing resources); [1] correct definition of productive efficiency (a point on, not inside, the PPF; full/efficient use of resources); [1] correct definition of economic growth (outward shift of the whole PPF); [1] correctly identifies growth requires more/better resources or technology, not simply moving along the existing curve; [1] clear, explicit statement contrasting a movement along/point on the curve (efficiency) with a shift of the curve (growth).

\( \%\Delta P = \dfrac{9.60-8.00}{8.00}\times100 = 20\% \). \( \%\Delta Q_d = \dfrac{420-500}{500}\times100 = -16\% \). \( PED = \dfrac{\%\Delta Q_d}{\%\Delta P} = \dfrac{-16}{20} = -0.80 \). Since the magnitude of PED (0.80) is less than 1, demand for this good is price inelastic.

Final answer: \( PED=-0.80 \) (inelastic).

[1] correct % change in price calculated (20%); [1] correct % change in quantity demanded calculated (-16%); [1] correct PED value, -0.80 (own figure rule applies: full credit for a correctly-calculated PED from the candidate's own % change figures, even if those contain an earlier error); [1] correct conclusion that demand is inelastic, consistent with their calculated value.

\( \%\Delta \text{income} = \dfrac{33\,000-30\,000}{30\,000}\times100 = 10\% \). \( \%\Delta Q_d = \dfrac{26-20}{20}\times100 = 30\% \). \( YED = \dfrac{\%\Delta Q_d}{\%\Delta \text{income}} = \dfrac{30}{10} = +3.0 \). Since YED is positive, restaurant meals are a normal good for this household (demand rises as income rises); since YED is also greater than 1, restaurant meals are a luxury (income-elastic normal) good, meaning demand for them rises proportionately more than income.

Final answer: \( YED=+3.0 \) (normal/luxury good).

[1] correct % change in income calculated (10%); [1] correct % change in quantity demanded calculated (30%); [1] correct YED value, +3.0 (own figure rule applies); [1] correct conclusion that the good is normal (positive YED), with valid reasoning; additional credit within this mark for correctly noting it is a luxury good (YED>1).

Diagram description: draw a standard demand and supply diagram, with price on the vertical axis and quantity on the horizontal axis. The normal supply curve represents the marginal PRIVATE cost (MPC) of production to the firm — this is the curve firms use to decide output. The demand curve represents marginal private benefit (MPB), assumed here to equal marginal social benefit (MSB), since there is no externality on the consumption side. Because production also creates a negative externality (e.g. pollution) imposing additional costs on third parties (external cost) that the firm does not pay, the marginal SOCIAL cost (MSC) curve lies above and to the left of the MPC curve, with the vertical gap between them at each quantity representing the external cost per unit.

The free market equilibrium occurs where MPC = MPB(=MSB), at price P1 and quantity Q1 (where the original supply curve, MPC, crosses the demand curve). However, the socially optimal (efficient) output occurs where MSC = MSB, at a lower quantity Q2 (where the MSC curve — lying above MPC — crosses the demand curve), at a higher price P2.

Because the free market produces at Q1, which is greater than the socially optimal quantity Q2, the market over-produces this good/service relative to what is socially optimal. For every unit produced between Q2 and Q1, the marginal social cost (MSC) exceeds the marginal social benefit (MSB), meaning society would be better off if fewer of these units were produced; this creates a welfare loss (deadweight loss), shown as the triangular area bounded by the MSC curve, the MSB (demand) curve, and the vertical line at Q1, between quantities Q2 and Q1. This divergence between the free-market outcome (Q1) and the socially efficient outcome (Q2) represents market failure, because the market, left to itself, fails to achieve an allocation of resources that maximises society's overall welfare.

[1] correctly draws/describes standard demand and (private) supply curves with axes correctly labelled; [1] correctly identifies MPC = the private supply curve, and MSB = demand; [1] correctly draws/describes the MSC curve lying above MPC, reflecting the external cost; [1] correctly identifies the free-market equilibrium (MPC=MPB) at Q1; [1] correctly identifies the socially optimal equilibrium (MSC=MSB) at a lower quantity Q2; [1] correctly identifies/describes the welfare loss (deadweight loss) triangle between Q2 and Q1; [1] correct overall conclusion that the free market over-produces relative to the social optimum, constituting market failure.

(a) Between 2018 and 2022, the price index for sugar-sweetened soft drinks rose steadily and continuously each year, from 100 to 130; over the same period, the quantity demanded index fell steadily and continuously each year, from 100 to 81 — as price rose, quantity demanded fell, consistent with the law of demand.

(b) \( \%\Delta\text{price} = \dfrac{130-100}{100}\times100 = +30\% \). \( \%\Delta\text{quantity demanded} = \dfrac{81-100}{100}\times100 = -19\% \).

Final answer: price index rose by 30%; quantity demanded index fell by 19%.

(a) [1] correctly describes the continuous rise in the price index; [1] correctly describes the continuous fall in the quantity demanded index. (b) [1] correct method for % change in price; [1] correct method for % change in quantity; [1] both final values correct (+30% and -19%).

(a) Price elasticity of demand (PED) measures the responsiveness (sensitivity) of the quantity demanded of a good to a change in its own price, calculated as the percentage change in quantity demanded divided by the percentage change in price.

(b) \( PED = \dfrac{\%\Delta Q_d}{\%\Delta P} = \dfrac{-19}{30} = -0.63 \) (2 d.p.). Since the magnitude of this value (0.63) is less than 1, demand for sugar-sweetened soft drinks is price inelastic over this period — a given percentage rise in price leads to a proportionately smaller percentage fall in quantity demanded. This indicates that consumers are relatively unresponsive to price changes for this good, which is consistent with it being habit-forming/somewhat addictive (sugar) and having few very close substitutes for consumers with an established preference for these drinks.

Final answer: \( PED\approx-0.63 \) (price inelastic demand).

(a) [1] basic definition (responsiveness of quantity demanded to price change); [2] full definition including the correct formula/ratio of percentage changes. (b) [1] correct method (%ΔQd/%ΔP); [1] correct PED value, -0.63 (own figure rule applies, ECF from earlier %change figures); [1] correctly identifies demand as price inelastic (|PED|<1); [1] valid, well-explained reasoning for why demand might be inelastic for this type of good (habit-forming, few close substitutes, necessity-like status for regular consumers).

Diagram description: draw a standard demand and supply diagram for the market for sugar-sweetened soft drinks, with price on the vertical axis and quantity on the horizontal axis, and an initial equilibrium at price P1 and quantity Q1, where the original supply curve (S1) crosses the demand curve (D). A specific (per-unit) tax imposed on producers increases their costs of supplying each unit, so the supply curve shifts vertically upward (and to the left) by the exact amount of the tax per unit, to a new curve S2 (parallel to S1, but with a vertical gap equal to the tax at every quantity).

The new equilibrium occurs where S2 crosses D, at a higher price P2 and a lower quantity Q2. The vertical distance between S1 and S2 at the new quantity Q2 represents the tax per unit; this vertical gap is split into two parts by the new price P2: the portion above the original price P1 (from P1 up to P2) is the part of the tax passed on to and paid by consumers (in the form of a higher price); the remaining portion (from the new, lower point on S1 at Q2, up to P1) is the part of the tax effectively absorbed by producers (as their after-tax revenue per unit received falls).

Given that demand for sugar-sweetened soft drinks is price inelastic (as calculated in the previous part, PED ≈ -0.63), the demand curve is relatively steep; graphically, this means that when supply shifts by the amount of the tax, the resulting rise in equilibrium price (P1 to P2) will be relatively large — close to the full amount of the tax — while the fall in equilibrium quantity (Q1 to Q2) will be relatively small. This means that, because demand is inelastic, the majority of the tax burden (or 'incidence') falls on consumers rather than producers, since consumers are relatively unresponsive to the price rise and continue buying nearly as much as before, at a higher price.

[1] correctly draws/describes the initial demand and supply diagram with correctly labelled axes and initial equilibrium P1, Q1; [1] correctly identifies the tax causes supply to shift left/upward; [1] correctly identifies the vertical size of the shift equals the tax per unit; [1] correctly identifies the new equilibrium at higher price P2 and lower quantity Q2; [1] correctly identifies the tax incidence is split between consumers (price rise) and producers (reduced revenue per unit); [1] correctly links inelastic demand to a steep/steeper demand curve; [1] correctly explains inelastic demand means price rises by relatively more, quantity falls by relatively less; [1] correctly concludes that with inelastic demand, most of the tax burden falls on consumers; [1] answer clearly integrates the specific PED value/finding from the earlier part into the analysis.

An indicative competent response would include:

Arguments in favour: high sugar consumption creates a negative externality (the costs to the health service and wider society of sugar-related illness, such as type 2 diabetes and obesity, exceed the private costs faced by the consumer), representing market failure due to overconsumption of the good relative to the social optimum. A tax raises the price faced by consumers (internalising some of the external cost, moving price closer to marginal social cost) and, as shown in Fig. 1, is associated with a genuine (if proportionately smaller) fall in quantity demanded, suggesting the tax does have some effect in reducing consumption. Revenue raised from the tax could also be used by the government to fund health education or subsidise healthier alternatives, further supporting the policy objective.

Arguments against/limitations: because demand for sugar-sweetened drinks is price inelastic (PED ≈ -0.63, calculated earlier), a given percentage tax-induced price rise produces only a proportionately smaller fall in quantity demanded — so, as the passage suggests, many consumers continue buying similar quantities of these drinks despite the higher price, limiting the tax's effectiveness in significantly reducing consumption/sugar intake. Because demand is inelastic, most of the tax burden falls on consumers (as identified in the previous diagrammatic analysis), which critics argue is regressive, since lower-income households spend a larger proportion of their income on such goods and are less able to absorb the higher price, raising equity concerns. There is also a risk that consumers substitute towards other high-sugar products not covered by the tax (e.g. sugary snacks), which would undermine the policy's overall effectiveness in improving public health if the tax is too narrowly targeted.

Evaluation/conclusion: whether the tax is judged 'effective' depends on the specific objective — if the aim is primarily to raise government revenue (e.g. to fund health programmes) a tax on inelastic demand is actually well-suited (since it reliably raises significant revenue with only a small fall in quantity), but if the primary aim is to substantially reduce sugar consumption itself, the tax alone is likely to have a limited effect given the inelasticity of demand shown in the data, and may need to be combined with complementary policies (such as health education, reformulation incentives for producers, advertising restrictions, or subsidies for healthier alternatives) to more effectively address the underlying market failure while mitigating the regressive impact on lower-income consumers.

Levels-of-response (QWC) mark scheme, out of 15 marks.

Level 1 — Basic (1–5 marks): Limited discussion, presenting only one side of the argument (e.g. benefits only, or drawbacks only) with little or no reference to the data in Fig. 1; weak terminology/structure.

Level 2 — Adequate (6–10 marks): Presents both arguments for and against the tax's effectiveness, with some reference to the passage and/or Fig. 1 data (e.g. mentions inelastic demand or the price/quantity trend), but analysis may be underdeveloped, or the concluding evaluation may be limited/unsupported; generally clear communication.

Level 3 — Competent (11–15 marks): Balanced, well-developed evaluation covering the market failure rationale for the tax, its genuine but limited effect on quantity demanded given inelastic demand (explicitly using the calculated PED and/or Fig. 1 data), the regressive/equity concern, and a reasoned, well-justified overall conclusion (e.g. tax works well for revenue-raising but is limited for reducing consumption alone, and may need complementary policies); correct, precise use of specialist terminology throughout; coherent structure; accurate spelling, punctuation and grammar.

0 marks: No creditable response. Strict criteria caps apply: an answer with no explicit use of the data/elasticity finding from Fig. 1 and earlier parts cannot reach Level 3, regardless of general economic knowledge shown.

An indicative competent response would include:

Reasons government intervention can be effective: markets can fail to allocate resources efficiently for several reasons — negative externalities (e.g. pollution) leading to overproduction, positive externalities (e.g. education, healthcare) leading to underproduction, information failure causing consumers to make poorly-informed decisions, and the underprovision of public goods (which are non-excludable and non-rival, so private firms have little incentive to provide them). Government intervention can directly target these specific failures: an indirect tax on a good with a negative externality (e.g. carbon tax, sugar tax) raises its price towards marginal social cost, reducing overconsumption; a subsidy on a good with a positive externality (e.g. vaccinations, education) lowers its price towards marginal social cost, encouraging consumption closer to the social optimum; regulation (e.g. banning harmful substances, minimum quality standards, compulsory information disclosure) can directly address information failure or protect consumers/the environment; and direct government provision (e.g. of public goods such as national defence or street lighting) resolves the free-rider problem inherent in leaving such goods to the private market.

Reasons intervention is not always effective/limitations (government failure): government intervention requires accurate information (e.g. about the correct size of an externality/optimal tax rate), which governments frequently lack, risking a tax or subsidy that is set too high or too low, over- or under-correcting the original market failure. Interventions can have unintended consequences — for example, an indirect tax on a good with inelastic demand (as commonly seen with habit-forming goods) may raise significant revenue but achieve only a small reduction in quantity consumed, while disproportionately burdening lower-income consumers (a regressive effect), creating an equity concern that itself represents a form of government failure. Price controls (e.g. a maximum price/price ceiling set below the market equilibrium) can create excess demand (shortages), while a minimum price/price floor set above equilibrium can create excess supply (surpluses/wasted output), each an example of intervention creating new inefficiencies. Administering and enforcing regulation or subsidy schemes also has direct costs and can be subject to regulatory capture or unintended loopholes, reducing effectiveness; and interventions are politically influenced, meaning they may reflect political priorities rather than a purely efficient response to the market failure identified.

Alternative or complementary approaches: in some cases, market-based solutions (e.g. tradeable pollution permits, which set a fixed quantity of allowed externality-causing activity and let the market determine the price) or private/voluntary solutions (e.g. Coasian bargaining between affected parties, where transaction costs are low) may correct market failure more efficiently or flexibly than direct government intervention, and are sometimes preferred by economists precisely because they harness market price signals rather than relying on government estimation of optimal tax/subsidy rates.

Evaluation/conclusion: government intervention CAN be highly effective at correcting market failure when it is well-targeted, based on good information, and appropriately sized — but it is not always the most effective solution, since poorly-designed or poorly-enforced intervention can itself create significant costs and new inefficiencies (government failure), and in some circumstances market-based or voluntary solutions may achieve a more efficient outcome at lower cost; the most appropriate response therefore depends on the specific type and scale of market failure, the quality of information available to policymakers, and a realistic assessment of the practical costs and risks of the intervention itself, rather than treating government intervention as automatically superior in every case.

Levels-of-response (QWC) mark scheme, out of 20 marks.

Level 1 — Basic (1–7 marks): Limited discussion, describing one or two types of market failure and/or intervention with little critical evaluation; weak terminology/structure.

Level 2 — Adequate (8–14 marks): Covers multiple types of market failure and corresponding interventions (e.g. externalities and taxes/subsidies; information failure and regulation) with some discussion of limitations/government failure, but evaluation may be underdeveloped, one-sided in places, or lack a clear overall conclusion; generally clear communication with occasional lapses.

Level 3 — Competent (15–20 marks): Full, well-organised evaluation covering a good range of market failures and the specific interventions used to address each, a clear and well-explained discussion of the limitations of intervention (government failure, unintended consequences, equity/regressive effects, cost of enforcement), consideration of alternative approaches (e.g. market-based solutions), and a well-reasoned, balanced overall conclusion that intervention is not automatically always the most effective solution; correct, precise use of specialist economic terminology throughout; coherent structure; accurate spelling, punctuation and grammar.

0 marks: No creditable response. Strict criteria caps apply: an answer that only presents arguments in favour of intervention, with no discussion of limitations/government failure, cannot reach Level 3, regardless of length.

Price stability is a macroeconomic objective in which the government/central bank aims to keep the general (average) level of prices in the economy rising at a low, stable and predictable rate (i.e. low inflation), typically by setting an explicit inflation target; this avoids both high, damaging inflation (which erodes the value of money and creates uncertainty) and deflation (a falling general price level, which can discourage spending and investment).

[1] basic identification (keeping inflation low); [2] adequate explanation referencing a low, stable rate of price increase; [3] identifies avoidance of both high inflation and deflation; [4] full, well-expressed definition referencing an explicit inflation target or the purpose of avoiding the costs of unstable prices.

A satisfactory balance of payments position means that, over time, the value of a country's exports of goods and services (plus other inflows, such as income and capital flows) is broadly in line with the value of its imports (plus other outflows), so the country is not running a persistent, unsustainable deficit (importing far more than it exports, requiring ongoing borrowing from abroad) or an excessively large surplus; a broadly balanced position supports a stable exchange rate and reduces the risk of financial instability.

[1] basic identification (relates to exports and imports); [2] adequate explanation of broad balance between exports and imports; [3] correctly identifies the risk of a persistent, unsustainable deficit; [4] full, well-expressed definition also referencing implications for exchange rate stability/sustainability.

Economic growth is a macroeconomic objective referring to a sustained increase in the real output (real gross domestic product, real GDP) of an economy over time; governments generally aim for steady, sustainable growth (rather than very rapid, unstable growth followed by a sharp downturn), as growth tends to raise average living standards, increase employment opportunities and government tax revenue.

[1] basic identification (increase in output/GDP); [2] adequate explanation referencing 'real' GDP/output (adjusted for inflation); [3] correctly identifies the aim of sustained/steady (rather than unstable) growth; [4] full, well-expressed definition also referencing the link to living standards/employment.

\( \text{unemployment rate} = \dfrac{\text{number unemployed}}{\text{labour force}}\times100 = \dfrac{1.6\text{ million}}{32.0\text{ million}}\times100 = 5.00\% \)

Final answer: unemployment rate = 5.00%.

[1] correct formula (unemployed ÷ labour force); [1] correct substitution; [1] \( 5.00\% \).

\( \text{real GDP growth} \approx \text{nominal GDP growth} - \text{inflation rate} = 6.0\%-3.5\% = 2.5\% \)

Final answer: approximate real GDP growth rate = 2.5%.

[1] correct method (nominal growth minus inflation); [1] correct substitution; [1] \( 2.5\% \) (accept a more precise calculation using \( \left(\frac{1.060}{1.035}-1\right)\times100=2.42\% \) for full credit if shown with correct method).

Diagram description: draw an aggregate demand and aggregate supply (AD/AS) diagram, with the general price level on the vertical axis and real national output (real GDP) on the horizontal axis. Draw a vertical long-run aggregate supply (LRAS) curve at the economy's initial potential output level, Y1, representing the economy's maximum sustainable output when all resources are fully and efficiently employed; draw a downward-sloping aggregate demand (AD) curve crossing LRAS at the initial equilibrium, giving initial price level PL1 and output Y1.

A successful supply-side policy, such as increased government investment in education and training, raises the skills, productivity and quality of the workforce over time; this increases the economy's productive capacity (its ability to produce output using its available resources), shifting the entire vertical LRAS curve to the right, to a new position LRAS2, at a higher potential output level, Y2 (Y2 > Y1).

With aggregate demand unchanged (AD remains in its original position), the new equilibrium occurs where AD crosses LRAS2, at output Y2 and a lower price level, PL2 (PL2 < PL1). This shows that a successful supply-side policy can increase an economy's potential real output (supporting economic growth) while simultaneously placing downward pressure on the price level (helping to control inflation) — in contrast to demand-side (AD-shifting) policies, which tend to increase output only at the cost of a higher price level (or vice versa).

[1] correctly draws/describes AD/AS diagram with correctly labelled axes; [1] correctly draws/describes vertical LRAS at initial potential output Y1; [1] correctly identifies initial equilibrium PL1, Y1; [1] correctly identifies the supply-side policy shifts LRAS to the right; [1] correctly identifies the new, higher potential output Y2; [1] correctly identifies the new equilibrium price level PL2 is lower than PL1 (with AD unchanged); [1] correct overall conclusion contrasting this simultaneous growth-with-lower-inflation outcome with the trade-off typically involved in demand-side policy.

(a) Northland's unemployment rate rose sharply from 4.0% in 2019 to a peak of 7.5% in 2020 (coinciding with the economic shock described in the passage), before falling steadily in each subsequent year, reaching 4.2% by 2023 — close to (though still slightly above) its pre-shock 2019 level.

(b) Change \( = 4.2\%-7.5\% = -3.3 \) percentage points, i.e. the unemployment rate fell by 3.3 percentage points between 2020 and 2023.

Final answer: unemployment fell by 3.3 percentage points from 2020 to 2023.

(a) [1] correctly describes the sharp rise to a 2020 peak; [1] correctly describes the subsequent steady fall to near pre-shock levels by 2023. (b) [1] correct method (2023 value minus 2020 value); [1] correct calculation shown; [1] correct value, -3.3 percentage points (accept 'fell by 3.3 percentage points').

The sharp rise in unemployment in 2020 was most likely predominantly cyclical (demand-deficient) unemployment: the economic shock caused a sudden, sharp fall in aggregate demand (as households and businesses reduced spending during the health emergency), meaning many firms saw a fall in demand for their output and, in response, reduced their demand for labour, laying off or furloughing workers across a wide range of industries simultaneously — this pattern (a sudden, economy-wide rise closely tied to a fall in demand/output) is characteristic of cyclical unemployment.

The unemployment rate remaining somewhat above its 2019 level even by 2023, despite the overall economic recovery, could be explained by structural unemployment: the 2020 shock may have permanently reduced employment in some industries (e.g. those reliant on activities that were significantly disrupted), meaning some workers who lost jobs in 2020 lack the skills required for jobs now available in growing industries, creating a persistent mismatch between the skills unemployed workers have and the skills employers now require (occupational immobility of labour). Frictional unemployment (workers temporarily between jobs, e.g. while searching for a new position matching their skills) would also continue to exist at some background level even in a fully recovered economy.

[1] correctly identifies cyclical/demand-deficient unemployment for 2020; [1] correct explanation linking the fall in aggregate demand to reduced derived demand for labour; [1] correctly identifies the economy-wide, sudden nature of this unemployment as characteristic of the cyclical type; [1] correctly identifies structural (or frictional) unemployment as relevant to the persistent 2023 gap; [1] correct explanation of the skills mismatch/occupational immobility (for structural) or job-search process (for frictional); [1] answer clearly and correctly distinguishes the two different types of unemployment discussed.

Diagram description: draw an aggregate demand and aggregate supply (AD/AS) diagram, with the general price level on the vertical axis and real national output (real GDP) on the horizontal axis, showing an upward-sloping short-run aggregate supply curve (SRAS) and an initial aggregate demand curve, AD1, giving an initial equilibrium at price level PL1 and output Y1.

(i) The 2020 shock caused households to reduce consumption spending (one component of aggregate demand) sharply, as businesses closed and confidence fell; this is shown as a leftward shift of the entire aggregate demand curve, from AD1 to AD2. The new equilibrium, where AD2 crosses SRAS, occurs at a lower price level, PL2, and a lower level of real output, Y2 (Y2 < Y1); this fall in real output is directly associated with a rise in unemployment (as shown in Fig. 1), since firms producing less output require fewer workers.

(ii) The government's expansionary fiscal policy (increased government spending, such as direct support payments) directly increases one component of aggregate demand (government spending, G); combined with the central bank's interest rate cuts (which reduce the cost of borrowing, encouraging consumption and investment, another component of AD), this is shown as aggregate demand shifting back to the right, from AD2 towards a new curve, AD3 (potentially back towards, or even beyond, the original AD1). The new equilibrium, where AD3 crosses SRAS, occurs at a higher level of real output than Y2 (supporting economic recovery and a fall in unemployment, consistent with Fig. 1 showing unemployment falling after 2020) but also at a higher price level than PL2 — this rightward shift in AD, especially if it continues alongside supply-side pressures (as described in the passage — global supply disruption and rising energy prices, which would also reduce SRAS), helps explain the sharp rise in inflation observed in Fig. 1 by 2022.

(i) [1] correctly draws/describes AD/AS diagram with correctly labelled axes and initial equilibrium; [1] correctly identifies the shock reduces consumption/a component of AD; [1] correctly shows AD shifting left; [1] correctly identifies the resulting fall in both price level and real output (recession), linked to rising unemployment. (ii) [1] correctly identifies expansionary fiscal policy directly raises government spending (a component of AD); [1] correctly identifies interest rate cuts support consumption/investment; [1] correctly shows AD shifting back to the right; [1] correctly identifies the resulting rise in both real output (supporting recovery/falling unemployment) and price level; [1] correctly links this demand-side pressure (potentially alongside supply-side pressures mentioned in the passage) to the later rise in inflation shown in Fig. 1.

An indicative competent response would include:

Arguments that the policy was effective: as shown in Fig. 1, unemployment, having spiked to 7.5% in 2020, fell steadily and substantially in every subsequent year, reaching 4.2% by 2023 — close to its pre-shock 2019 level of 4.0%. This is consistent with the expansionary fiscal spending (direct support payments, government spending) and the central bank's interest rate cuts successfully supporting aggregate demand, protecting jobs and enabling a relatively swift recovery in employment following a severe, sudden shock — arguably preventing a much deeper or more prolonged recession and period of high unemployment than might otherwise have occurred.

Arguments/evidence against full effectiveness (the inflation trade-off): Fig. 1 also shows inflation rising sharply, from just 0.5% in 2020 to 8.0% by 2022 — a significant and potentially costly side effect. Sustained expansionary demand-side policy, by increasing aggregate demand, is likely to have contributed to this inflationary pressure (alongside the supply-side factors mentioned in the passage, such as global supply chain disruption and rising energy prices, which independently reduced aggregate supply and pushed up prices) — when a demand-side stimulus coincides with supply-side cost pressures, the resulting inflation can be considerably worse than from either factor alone. High inflation of 8% erodes the real value of wages and savings, creates uncertainty for businesses and consumers, and can itself be economically damaging, potentially disproportionately affecting lower-income households who spend a larger share of income on essentials. There is also a risk that policy was maintained for longer than needed once recovery was underway (a time lag/timing issue common to fiscal and monetary policy), amplifying the eventual inflationary overshoot; and the large fiscal spending is also likely to have significantly increased government borrowing/debt, which represents a further cost to be weighed against the employment benefits achieved.

Evaluation/conclusion: the policy response can be judged broadly effective in achieving its primary, immediate objective of supporting employment through a severe demand-side shock, as shown by the recovery in the unemployment rate — but this came at a significant cost in terms of the subsequent surge in inflation, illustrating the classic short-run trade-off between unemployment and inflation that expansionary demand-side policy can create, and this trade-off was likely worsened by the coincidence of independent supply-side price pressures. A more complete evaluation would also weigh the effect on government debt and consider whether a more moderate or better-timed policy response, or a greater subsequent reliance on supply-side policy to address the later structural/supply-driven aspects of unemployment and inflation, might have achieved a better overall balance between the competing macroeconomic objectives.

Levels-of-response (QWC) mark scheme, out of 15 marks.

Level 1 — Basic (1–5 marks): Limited discussion, presenting only one side (e.g. benefits for employment only, or costs only) with little or no explicit reference to the data in Fig. 1; weak terminology/structure.

Level 2 — Adequate (6–10 marks): Presents both the employment benefits and the inflation cost of the policy, with some reference to the passage and/or Fig. 1 data, but analysis of the trade-off may be underdeveloped, or the concluding evaluation may be limited/unsupported; generally clear communication.

Level 3 — Competent (11–15 marks): Balanced, well-developed evaluation explicitly using the Fig. 1 data (unemployment recovery AND inflation surge) to assess policy effectiveness, correctly explains the unemployment-inflation trade-off and the compounding role of independent supply-side pressures mentioned in the passage, and reaches a well-reasoned, justified overall conclusion (e.g. weighing employment gains against inflation/debt costs, or suggesting a better policy balance); correct, precise use of specialist economic terminology throughout; coherent structure; accurate spelling, punctuation and grammar.

0 marks: No creditable response. Strict criteria caps apply: an answer with no explicit use of the Fig. 1 unemployment AND inflation data together cannot reach Level 3, regardless of general economic knowledge shown.

An indicative competent response would include:

Demand-side policies and the trade-off: expansionary fiscal policy (e.g. increased government spending or tax cuts) and expansionary monetary policy (e.g. interest rate cuts) work by increasing aggregate demand, shifting the AD curve to the right along the upward-sloping short-run aggregate supply (SRAS) curve; this can reduce cyclical unemployment by increasing output and the derived demand for labour, but because it moves the economy along the SRAS curve, it also tends to raise the general price level (inflation) — a classic short-run trade-off between unemployment and inflation (broadly reflected in the idea of a Phillips curve relationship). Contractionary demand-side policy can reduce inflation but at the cost of raising unemployment, so demand-side policy alone struggles to achieve low unemployment and low inflation simultaneously.

Supply-side policies as a potential solution: supply-side policies aim to increase an economy's productive capacity/potential output directly, by improving the quantity or quality of factors of production — examples include increased investment in education and training (improving labour productivity and reducing structural unemployment by better matching workers' skills to employer needs), infrastructure investment, deregulation to increase competition and efficiency, and policies to increase labour market flexibility (e.g. reducing barriers to hiring/firing, improving job information services to reduce frictional unemployment). Graphically, successful supply-side policy shifts the vertical long-run aggregate supply (LRAS) curve to the right, increasing potential output; with aggregate demand unchanged, this can allow the economy to produce more output at a LOWER price level (or absorb demand growth with less inflationary pressure) — in principle allowing lower unemployment (via structural/frictional improvements and higher sustainable output) alongside lower inflation (via increased supply capacity), avoiding the direct AD-driven trade-off.

Limitations of supply-side policy: supply-side policies (e.g. education and training investment, infrastructure projects) typically take a long time to have an effect — improving workforce skills or building infrastructure can take years, so supply-side policy is generally poorly suited to addressing a sudden, sharp rise in cyclical unemployment (e.g. from a demand-side shock), which demand-side policy can address much more quickly. Many supply-side policies (e.g. large infrastructure or education investment) are also expensive for government, raising questions about the opportunity cost/fiscal sustainability of pursuing them at scale. Supply-side policy is also generally ineffective at reducing unemployment that IS demand-deficient (cyclical) in nature, since it addresses the productive capacity of the economy rather than the level of demand for the output that capacity can produce — if aggregate demand is insufficient, increasing potential output alone will not necessarily translate into higher actual output or lower unemployment.

Evaluation/conclusion: supply-side policy offers a genuine potential route to achieving low unemployment and low inflation simultaneously in the medium-to-long run, by directly addressing structural/frictional unemployment and expanding productive capacity without the inflationary pressure associated with demand-side stimulus — but it is not a complete substitute for demand-side policy, since it acts slowly and cannot, by itself, resolve a sudden cyclical/demand-deficient unemployment problem. In practice, the two approaches are often complementary rather than competing: demand-side policy can be used to manage short-run fluctuations in output and employment, while supply-side policy is pursued over a longer time horizon to raise an economy's sustainable growth rate and reduce the underlying (structural/frictional) rate of unemployment without generating additional inflationary pressure — so the most effective overall macroeconomic strategy is likely to combine both approaches rather than relying on either alone.

Levels-of-response (QWC) mark scheme, out of 20 marks.

Level 1 — Basic (1–7 marks): Limited discussion, describing demand-side and/or supply-side policy with little clear evaluation of the trade-off or comparison between the two approaches; weak terminology/structure.

Level 2 — Adequate (8–14 marks): Explains both demand-side policy (and its unemployment-inflation trade-off) and supply-side policy (and how it could avoid this trade-off), with some named examples, but the evaluation of supply-side policy's own limitations (time lags, cost, ineffectiveness against cyclical unemployment) may be underdeveloped or absent; generally clear communication.

Level 3 — Competent (15–20 marks): Full, well-organised evaluation covering the demand-side trade-off (with correct diagrammatic/AD-AS style reasoning in prose), how supply-side policy can in principle achieve both objectives together (with a correct LRAS-based explanation), a clear discussion of supply-side policy's own limitations (time lags, cost, ineffectiveness against cyclical unemployment), and a well-reasoned, balanced overall conclusion (e.g. recognising the two approaches as complementary rather than substitutes); correct, precise use of specialist economic terminology throughout; coherent structure; accurate spelling, punctuation and grammar.

0 marks: No creditable response. Strict criteria caps apply: an answer that discusses only demand-side OR only supply-side policy, with no comparison between the two, cannot reach Level 3.