2024 CCEA AS-Level Economics 4410 Practice Paper with Answers

(a) At B, food output is 90; at C, food output is 60. The opportunity cost of the extra 20 units of machinery (from 20 to 40) is the fall in food output: \( 90 - 60 = 30 \) units of food.
(b) Following the straight line between B (20, 90) and C (40, 60), the maximum food output attainable when producing 30 units of machinery is 75 units (halfway between 90 and 60). Since point D produces only 60 units of food at 30 units of machinery, which is below the frontier, D represents a combination of output that is attainable but does not use all of the economy's resources fully or efficiently (for example, due to unemployed resources); the economy could produce more of both goods by moving out to the PPF itself.

(a) [1] for correct method (food at B minus food at C); [1] for correct answer of 30 units of food.
(b) [1] for identifying that D lies inside/within the PPF; [1] for explaining this means resources are not fully/efficiently used (e.g. unemployment of resources); [1] for explaining that more of both goods could be produced by moving towards the frontier.

(a) \( \%\Delta Q_D = \dfrac{440-500}{500} \times 100 = -12\% \). \( \%\Delta P = \dfrac{12-10}{10} \times 100 = 20\% \). \( PED = \dfrac{\%\Delta Q_D}{\%\Delta P} = \dfrac{-12}{20} = -0.6 \).
(b) Since the PED value of -0.6 has a magnitude less than 1, demand for this good is price inelastic, meaning quantity demanded changes proportionately less than price. This is typical of a necessity, since consumers continue to buy broadly similar quantities of necessities even when the price rises, as they have few good substitutes and cannot easily reduce consumption.

(a) [1] for correct %ΔQD = -12%; [1] for correct %ΔP = 20%; [1] for correct PED = -0.6 (own-figure rule applies).
(b) [1] for correctly identifying 'necessity' (ft from (a) if |PED|<1); [1] for a valid supporting reason referencing inelastic demand/lack of substitutes.

(a) \( \%\Delta Q_S = \dfrac{260-200}{200} \times 100 = 30\% \). \( \%\Delta P = \dfrac{6-5}{5} \times 100 = 20\% \). \( PES = \dfrac{\%\Delta Q_S}{\%\Delta P} = \dfrac{30}{20} = 1.5 \).
(b) Since PES = 1.5 is greater than 1, supply is price elastic (quantity supplied responds proportionately more than the change in price). This could be explained by the firm holding spare capacity or stocks of the good, allowing it to increase output quickly in response to the price rise, or by the good having a short production time.

(a) [1] for correct %ΔQS = 30%; [1] for correct %ΔP = 20%; [1] for correct PES = 1.5 (own-figure rule applies).
(b) [1] for correctly identifying 'elastic' (ft from (a) if PES>1); [1] for a valid supporting factor (e.g. spare capacity, stock levels, short production time, ease of factor mobility).

(a) Economic rent = actual wage - transfer earnings \( = £30 - £22 = £8 \) per hour.
(b) Transfer earnings are the minimum payment needed to keep the worker in their current occupation, which is given as £22 per hour.
(c) Economic rent is any payment received by a factor of production over and above the minimum (transfer earnings) needed to keep it in its current use. On an upward-sloping labour supply curve, transfer earnings are represented by the area under the supply curve up to the quantity of labour employed, while economic rent is the area above the supply curve but below the wage rate actually paid, representing a surplus earned by workers who would have been willing to work for less than the wage they actually receive.

(a) [1] for correct method (wage minus transfer earnings); [1] for correct answer £8.
(b) [1] for correctly stating £22 (transfer earnings given directly in the question).
(c) [1] for a correct definition of economic rent as payment above the minimum needed to retain the factor; [1] for correctly relating this to the area above the labour supply curve and below the wage rate.

A successful advertising campaign makes the good more desirable to consumers at every price, increasing demand. This is shown as a rightward shift of the whole demand curve, from D1 to D2 (a shift, not a movement along the curve, since it is caused by a non-price factor). The supply curve (S) is unaffected by advertising and remains unchanged, upward sloping. At the original equilibrium price, quantity demanded on D2 now exceeds quantity supplied, creating excess demand; price is bid upwards until a new equilibrium is reached where D2 intersects S, at a point with both a higher equilibrium price and a higher equilibrium quantity than the original equilibrium (where D1 intersected S).

[1] for identifying that demand increases/shifts (not a movement along the curve); [1] for correctly describing this as a rightward shift from D1 to D2; [1] for correctly stating supply is unaffected/unchanged; [1] for correctly describing the process of price rising to clear excess demand at the original price; [1] for correctly concluding that both equilibrium price and equilibrium quantity rise.

Between 2017 and 2019, the average price of sugary soft drinks rose from £0.90 to £1.05 per litre, an increase of \( \dfrac{1.05-0.90}{0.90}\times100 = 16.7\% \) (to 1 d.p.). Over the same period, weekly sales volume fell from 140 million litres to 122 million litres, a decrease of \( \dfrac{122-140}{140}\times100 = -12.9\% \) (to 1 d.p.), i.e. a fall of approximately 12.9%. Overall, Table 1 shows that as the price of sugary soft drinks rose following the introduction of the levy, the quantity sold fell, consistent with the law of demand.

[1] for correctly describing the rise in average price; [1] for correctly calculating the percentage increase in price (16.7%, accept 16.6-16.7%); [1] for correctly describing the fall in weekly sales volume; [1] for correctly calculating the percentage decrease in sales volume (-12.9%, accept -12.8% to -12.9%); [1] for an overall valid concluding comment linking the two trends (e.g. consistent with the law of demand).

The Soft Drinks Industry Levy is an indirect tax paid by manufacturers, which increases their costs of production for each unit of sugary drink produced. This is shown on a diagram as a leftward (upward) shift of the supply curve, from S1 to S2, since firms are now only willing to supply the same quantity as before at a higher price (or a smaller quantity at the original price). At the original equilibrium price, quantity supplied on S2 is now less than the unchanged quantity demanded, creating excess demand; this pushes the price upwards until a new equilibrium is reached, where S2 intersects the demand curve, at a higher equilibrium price than before, consistent with the price rise shown in Table 1. The extent to which the higher production cost is passed on to consumers as a higher price, rather than absorbed by producers as lower profit margins, depends on the relative price elasticities of demand and supply for the good.

[1] for identifying the levy as an indirect tax raising production costs; [1] for correctly describing this as a leftward/upward shift of supply (S1 to S2); [1] for correctly explaining that supply, not demand, shifts; [1] for describing the resulting excess demand at the original price; [1] for correctly concluding that equilibrium price rises to a new, higher level; [1] for a valid additional point on tax incidence depending on relative elasticities.

The extent to which manufacturers can pass the cost of an indirect tax on to consumers, rather than absorbing it themselves through lower profit margins, depends heavily on the price elasticity of demand (PED) for the good. If demand is relatively price inelastic (a low, habitual good with few close substitutes), consumers continue to buy a similar quantity even as price rises, so manufacturers can pass on a larger proportion of the tax as a higher price without losing many sales; if demand is relatively elastic, raising price would cause a proportionately larger fall in quantity demanded, so firms would be more reluctant to pass the tax on fully, absorbing more of it themselves to protect sales volume.

Using the data in Table 1, we can estimate the (arc) PED implied by the levy: the price rose by approximately 16.7%, while quantity fell by approximately 12.9%, giving an estimated PED of roughly \( \dfrac{-12.9}{16.7} \approx -0.77 \). Since the magnitude of this estimated PED is less than 1, demand for sugary soft drinks appears to be relatively price inelastic, which is consistent with manufacturers being willing to pass on a substantial part of the levy as a higher price (as described in the article) while experiencing a comparatively smaller proportionate fall in sales volume. This inelastic demand may reflect habitual consumption patterns and the lack of perfect substitutes for some consumers.

However, part of the fall in sales volume shown in Table 1 is also likely to reflect the reformulation response described in the article: as manufacturers reduced sugar content to fall below the levy's thresholds, some previously taxed 'sugary' drinks would no longer be classified within this market at all, meaning the fall in recorded sales volume of standard sugary drinks partly reflects genuine substitution towards reformulated, non-levied alternatives rather than a pure price-elasticity response along a single unchanged demand curve.

[1] for explaining that with inelastic demand, more of the tax can be passed on as higher price; [1] for explaining that with elastic demand, less of the tax would be passed on / more absorbed by firms; [1] for correctly calculating/estimating PED from Table 1 data (approximately -0.77, own-figure rule applies); [1] for correctly interpreting this PED as relatively inelastic; [1] for linking inelastic demand to the relatively larger price rise vs smaller quantity fall observed; [1] for a developed explanation of why demand might be inelastic (habitual good, few substitutes); [1] for identifying reformulation as an additional, non-price-elasticity explanation for the fall in volume; [1] for explaining that reformulated drinks leaving the taxed category reduces recorded 'sugary drink' sales; [1] for overall coherent, well-structured analysis integrating both explanations.

From the perspective of consumers, the levy has raised the price of sugary drinks (as shown in Table 1), which in theory discourages consumption of a good linked to obesity and type 2 diabetes, providing a long-run health benefit. However, since lower-income households tend to spend a larger proportion of their income on soft drinks than higher-income households, the levy is regressive: it takes a proportionately larger share of income from poorer consumers who continue to buy sugary drinks, without necessarily changing the behaviour of those for whom demand is genuinely price inelastic. There is also a risk that some consumers simply substitute towards other untaxed sources of sugar, such as sweets, cakes or other snacks, undermining the levy's ultimate health objective, an example of possible government failure through unintended consequences.

From the perspective of producers, the levy has been at least partially successful in changing behaviour, since many manufacturers reformulated their products to reduce sugar content and avoid the tax altogether, as described in the article; this suggests the tax created a strong incentive for innovation in product recipes. However, reformulation itself involves research and development costs, and firms that are unable or unwilling to reformulate face either lower profit margins (if they absorb the tax) or reduced sales (if they pass it on fully, given at least some price sensitivity among consumers), which could particularly disadvantage smaller manufacturers without the resources to quickly reformulate.

From the perspective of the government, the levy has generated additional tax revenue, which, according to the article, has been used to fund health and school sports programmes, potentially reinforcing the policy's health objectives elsewhere. The government also benefits from the levy being relatively simple to administer compared with some alternative interventions, such as banning or precisely regulating sugar content directly. However, there are administrative costs of monitoring and enforcing the levy across many manufacturers and products, and government failure could arise if incomplete information about actual consumer substitution patterns means the true effect on overall sugar consumption (rather than just soft drink consumption) is smaller than intended.

Overall, the evidence in Table 1 of a substantial price rise alongside a fall in sales volume of sugary soft drinks suggests the levy has had some genuine effect in reducing consumption of standard sugary drinks and in incentivising reformulation, which supports its effectiveness as a policy tool. However, its regressive impact on lower-income consumers, the risk of substitution towards other untaxed unhealthy products, and the compliance costs imposed on producers mean that its overall effectiveness in improving public health, rather than simply shifting consumption patterns within the soft drinks market, remains open to debate; a more complete policy response might combine the levy with complementary measures such as public information campaigns or regulation of other sugary products.

Level 1 (1-5): Basic knowledge of the levy and/or one stakeholder perspective; limited use of the case study data; little balance or evaluation; basic QWC.
Level 2 (6-10): Sound knowledge and understanding covering at least two of the three perspectives (consumers, producers, government) with relevant use of case study evidence; some balanced discussion of advantages and disadvantages; satisfactory use of specialist vocabulary; satisfactory QWC.
Level 3 (11-15): Detailed, well-developed analysis covering all three perspectives (consumers, producers, government), explicitly grounded in the case study evidence (including Table 1 and the article's points on reformulation, regressivity and substitution); a balanced critical examination weighing effectiveness against limitations; a substantiated overall conclusion; confident use of specialist vocabulary; high standard of QWC with a well-organised, coherent response.

The basic economic problem is that resources are scarce relative to society's wants, so a mechanism is needed to decide what, how and for whom to produce. In a free market, the price mechanism performs three key functions: it acts as a signal, communicating information about relative scarcity and consumer preferences to producers; as an incentive, encouraging producers to reallocate resources towards goods where price (and therefore profit) is rising, and consumers to economise on goods becoming more expensive; and as a rationing device, ensuring that a good is allocated to those consumers willing and able to pay the market price. Where demand and supply interact freely, the resulting equilibrium maximises community surplus (the sum of consumer and producer surplus), which economists generally regard as allocatively efficient, since resources are directed towards their most highly valued uses without the need for central planning or costly government administration; this can also be shown using a production possibility frontier (PPF), where free-market price signals help move an economy towards, rather than within, its frontier over time.

However, the claim that the price mechanism is always the most effective method of allocation is difficult to sustain once market failure is considered. Markets frequently fail to account for externalities, costs or benefits affecting third parties that are not reflected in market prices (for example, pollution from production is not fully priced into the market price of a good, leading to overproduction relative to the socially optimal level). Certain goods, such as public goods, may not be provided at all by a free market due to the free-rider problem, since they are non-excludable and non-rival, meaning private producers cannot profitably charge for them even though society values them. Markets can also fail due to information gaps, where consumers or producers lack the information needed to make economically efficient decisions, and due to the existence of monopoly power, where a single firm can restrict output and raise price above the competitive level, reducing community surplus rather than maximising it.

Furthermore, even where the price mechanism does allocate resources 'efficiently' in the narrow economic sense of maximising community surplus, this says nothing about whether the resulting allocation is equitable: since the rationing function of price allocates goods to those able and willing to pay, a free market can produce very unequal outcomes, potentially leaving some individuals unable to access goods and services, such as healthcare or basic nutrition, that society may regard as necessities. This has led most real-world economies to operate as mixed economies, in which government intervention (through taxation, subsidies, regulation, or direct provision) is used to correct specific market failures or address equity concerns, rather than relying purely on free-market price signals.

In conclusion, the price mechanism is generally a highly effective, decentralised method of allocating scarce resources in the majority of everyday markets, avoiding the informational and administrative burdens associated with central planning. However, the word 'always' in the statement overstates its universal effectiveness: in the presence of externalities, public goods, information gaps, monopoly power, and legitimate equity concerns, unregulated free-market allocation can lead to a misallocation of resources or socially undesirable outcomes, which is why virtually all modern economies choose to supplement the price mechanism with some degree of government intervention rather than relying on it exclusively.

Level 1 (1-7): Basic knowledge of the price mechanism and/or market failure; limited analysis; largely one-sided or descriptive; little use of economic terminology; basic structure.
Level 2 (8-14): Sound knowledge and understanding of how the price mechanism allocates resources (signalling, incentive, rationing functions) with some developed analysis; at least one relevant market failure example discussed; some balance between the effectiveness and limitations of the price mechanism; appropriate use of specialist vocabulary.
Level 3 (15-20): Detailed, well-developed analysis of the price mechanism's functions and its role in allocative efficiency (community surplus), explicitly balanced against multiple, well-explained market failures (e.g. externalities, public goods, information gaps, monopoly power) and equity considerations; a substantiated, well-reasoned overall judgement directly addressing the word 'always' in the statement; confident, wide-ranging use of specialist economic vocabulary; coherent, well-structured response with high standard of QWC.

(a) Total injections \( = 40+60+50 = £150\text{bn} \). Total withdrawals \( = 35+55+45 = £135\text{bn} \).
(b) Since injections (£150bn) exceed withdrawals (£135bn), more spending is entering the circular flow of income than is leaking out of it. This means aggregate demand and, in turn, national income are likely to rise, as the circular flow expands until a new equilibrium is reached where injections once again equal withdrawals.

(a) [1] for correct total injections £150bn; [1] for correct total withdrawals £135bn.
(b) [1] for correctly stating national income is likely to rise; [1] for correctly comparing injections and withdrawals (J>W); [1] for a developed explanation referencing the circular flow expanding towards a new equilibrium.

(a) Budget balance \( = G - T = 900 - 850 = £50\text{bn} \). Since government spending exceeds tax revenue, this represents a budget deficit of £50bn.
(b) The government could raise tax rates (for example, increasing income tax or VAT rates) to increase tax revenue collected, which, if government spending is held constant, would directly reduce the gap between spending and revenue and so reduce the size of the budget deficit. Alternatively, the government could cut the level of government spending itself.

(a) [1] for correct method (G-T); [1] for correct answer £50bn deficit (must identify deficit, not surplus).
(b) [1] for identifying a valid fiscal policy tool (raising taxes or cutting spending); [1] for correctly explaining its direct effect on the budget balance; [1] for a developed, contextualised explanation.

(a) \( CPI = \dfrac{262.50}{250} \times 100 = 105 \).
(b) Since the base year index is 100, the annual inflation rate is the percentage increase in the index: \( 105 - 100 = 5\% \).
(c) One limitation is that the CPI is based on a single 'representative' basket of goods and weights based on average household spending patterns, which may not reflect the actual spending patterns of particular groups of households, such as pensioners (who may spend a higher proportion of income on heating and healthcare) or low-income households, meaning the CPI may over- or under-state the true change in the cost of living for these specific groups.

(a) [1] for correct method (262.50/250 x 100); [1] for correct answer CPI=105.
(b) [1] for correct method (CPI - 100); [1] for correct answer 5% (ft from (a)).
(c) [1] for a valid, developed limitation of the CPI (e.g. unrepresentative basket/weights for specific groups, excludes housing costs in some measures, doesn't capture quality changes).

A rise in the Bank Rate increases the cost of borrowing for households and firms (e.g. higher mortgage and loan repayments) and increases the reward for saving, both of which discourage consumption (C) and investment (I), two of the components of aggregate demand. Aggregate demand (AD) therefore shifts leftward, from AD1 to AD2. Given an unchanged short-run aggregate supply (SRAS) curve, the new macroeconomic equilibrium occurs at a lower price level than before, reducing (demand-pull) inflationary pressure in the economy. However, this leftward shift in AD also results in lower real national output (and, by extension, potentially higher unemployment) in the short run than would otherwise have occurred, illustrating the trade-off policymakers face between controlling inflation and supporting output/employment.

[1] for explaining higher Bank Rate raises cost of borrowing/reward for saving; [1] for correctly identifying the effect on consumption and/or investment (fall); [1] for correctly describing this as a leftward shift of AD; [1] for correctly concluding the price level falls/inflationary pressure is reduced at the new equilibrium; [1] for correctly noting the trade-off of lower real output/growth in the short run.

(a) Percentage change \( = \dfrac{1.32-1.20}{1.20} \times 100 = 10\% \). Since the pound now buys more dollars than before, this represents an appreciation of the pound (a depreciation of the dollar) of 10%.
(b) UK exporters selling to the USA will find that, at the new exchange rate, their goods become more expensive in dollar terms for American buyers (assuming the sterling price is unchanged), which is likely to reduce the price competitiveness of UK exports in the US market and, other things being equal, reduce the quantity of exports demanded, potentially harming UK exporters' revenue and international competitiveness.

(a) [1] for correct method; [1] for correct percentage change 10%; [1] for correctly identifying this as an appreciation.
(b) [1] for identifying that UK exports become more expensive in dollar terms; [1] for a developed explanation of the likely effect on demand/competitiveness for UK exporters (ft from (a)).

Between Year 1 and Year 3, the CPI inflation rate rose overall from 2.5% to 4.0%, an increase of \( 4.0-2.5 = 1.5 \) percentage points, but this was not a steady rise: inflation first spiked sharply to 9.0% in Year 2 (a rise of 6.5 percentage points from Year 1) before falling back to 4.0% in Year 3 (a fall of 5.0 percentage points from Year 2). By contrast, the Bank Rate rose continuously and substantially across all three years, from 0.25% in Year 1 to 5.25% in Year 3, an increase of \( 5.25-0.25 = 5.00 \) percentage points, with the Bank Rate rising even between Year 2 and Year 3 while CPI inflation was already falling, consistent with the Bank of England continuing to tighten policy in response to the earlier inflation spike and to try to keep inflation on a path back towards target.

[1] for correctly describing the overall rise in CPI inflation (2.5% to 4.0%) with correct percentage point change (1.5 pp); [1] for correctly identifying the Year 2 spike to 9.0% (not a steady rise); [1] for correctly describing the continuous rise in Bank Rate across all three years with correct overall percentage point change (5.00 pp); [1] for noting the Bank Rate continued rising into Year 3 even as inflation fell; [1] for an overall valid comparative comment linking the two series.

Cost-push inflation, of the type described in the article, arises when the costs of production rise (for example, due to higher global energy or imported food prices), causing the short-run aggregate supply (SRAS) curve to shift leftward/upward. At the new equilibrium, where the unchanged AD curve intersects the new SRAS curve, the price level is higher than before, but real national output is lower than before, since firms are supplying less at every price level due to higher costs; this combination of higher inflation and lower output/growth is sometimes referred to as 'stagflation'.

By contrast, demand-pull inflation arises from a rightward shift of the aggregate demand (AD) curve itself, for example due to rising consumer spending, business investment, government spending, or net exports. With an unchanged SRAS curve, the new equilibrium (where the new AD curve intersects SRAS) has both a higher price level and higher real output than before, since the economy moves up along the existing SRAS curve rather than the SRAS curve itself shifting.

The Year 2 inflation spike in Table 2 is more consistent with cost-push inflation, given the article's explicit reference to rising global energy and food prices and supply chain disruption as the cause, rather than a surge in domestic aggregate demand.

[1] for correctly identifying cost-push inflation as caused by a leftward/upward shift in SRAS; [1] for correctly stating this raises price level but lowers real output; [1] for correctly identifying demand-pull inflation as caused by a rightward shift in AD; [1] for correctly stating this raises both price level and real output; [1] for a valid contrast between the two mechanisms (e.g. effect on output/growth being opposite); [1] for correctly applying this to conclude Table 2's Year 2 spike is more consistent with cost-push inflation, with reference to the article.

When the Bank of England raises the Bank Rate, commercial banks generally respond by raising the interest rates they charge on loans and mortgages and the interest rates they offer on savings accounts. This has several effects that combine to reduce aggregate demand (AD). First, the higher cost of borrowing discourages consumers from taking out loans or using credit to finance spending, while the higher reward for saving encourages households to save rather than spend, so consumption (C) falls. Second, the higher cost of borrowing raises the cost of finance for firms considering new projects, and the higher required rate of return needed to justify investment reduces the expected profitability of many projects, so investment (I) falls. Third, higher UK interest rates tend to make holding sterling assets more attractive to foreign investors seeking a better return, increasing demand for the pound and causing it to appreciate; this appreciation makes UK exports relatively more expensive abroad and imports relatively cheaper for UK consumers, so net exports (X-M) are likely to fall as well.

As consumption, investment and net exports (three of the four components of aggregate demand) all tend to fall following a rise in the Bank Rate, the AD curve shifts leftward, from AD1 to AD2. Given an unchanged short-run aggregate supply (SRAS) curve, the new macroeconomic equilibrium (where AD2 intersects SRAS) has a lower price level than before, which is the intended reduction in inflationary pressure. However, this same leftward shift in AD also results in lower real national output than would otherwise have occurred at the original equilibrium, illustrating that this transmission mechanism achieves lower inflation partly at the cost of a slower growth or falling real output in the short run, with the exact division between the fall in price level and the fall in output depending on the shape and position of the SRAS curve at the time.

[1] for correctly explaining higher Bank Rate raises the cost of borrowing/return on saving; [1] for correctly linking this to a fall in consumption; [1] for correctly linking this to a fall in investment; [1] for correctly explaining the exchange rate appreciation channel (higher rates attract capital inflows); [1] for correctly linking exchange rate appreciation to a fall in net exports; [1] for correctly identifying that AD shifts leftward overall; [1] for correctly describing the new AD-AS equilibrium with a lower price level; [1] for correctly noting the accompanying fall in real output/growth as a cost of this mechanism; [1] for overall coherent, well-sequenced analysis of the full transmission mechanism.

From the perspective of households, higher interest rates directly increase the cost of mortgage repayments and other borrowing, squeezing disposable income at a time when households are already facing a cost-of-living squeeze from rising energy and food prices; this is a significant real cost of the policy, particularly for lower-income and heavily indebted households. On the other hand, if the policy is successful in bringing inflation down, households also benefit from their incomes and savings retaining their real value for longer, and higher interest rates directly benefit net savers through higher returns.

From the perspective of firms, higher Bank Rate increases the cost of finance for investment and working capital, and reduced household consumption spending (as households cut back and prioritise debt repayments) can reduce firms' sales and revenue, particularly for businesses selling non-essential goods and services. Stable and predictable prices, if eventually achieved, do benefit firms' long-term planning and investment decisions, but the article's critics argue that, since the inflation was largely caused by global cost factors outside firms' and the UK's control, raising interest rates does not address the root cause of higher costs (e.g. energy input costs) and instead simply adds a further squeeze on firms already dealing with higher costs, potentially reducing investment, employment and, in some cases, business survival.

From the perspective of the government, successfully reducing inflation towards the 2% target, as shown by the fall from 9.0% in Year 2 to 4.0% in Year 3 in Table 2, supports the credibility of the Bank of England's inflation-targeting framework and can help keep inflation expectations anchored, which is valuable for long-term macroeconomic stability. However, since raising interest rates works mainly by reducing aggregate demand rather than by addressing the cost-push, supply-side causes described in the article (global energy and food prices, supply chain disruption), critics argue this transmission mechanism is a blunt tool for this type of inflation: it risks unnecessarily depressing output and raising unemployment (contributing to slower economic growth or even recession) without directly tackling the underlying global cost pressures, which may instead call for complementary supply-side measures (for example, on energy security or supply chain resilience) rather than monetary policy alone.

Overall, monetary policy did appear to have some effect, given the fall in CPI inflation from its Year 2 peak by Year 3 in Table 2, and it plays an important role in maintaining the credibility of the inflation target. However, its effectiveness in tackling inflation whose root cause lies in global cost-push factors is inherently limited and carries a real cost in terms of reduced household spending power, higher costs of finance for firms, and the risk of higher unemployment, suggesting that relying on monetary policy alone, without complementary fiscal or supply-side responses, may not be the most effective or least costly overall approach to this type of inflation.

Level 1 (1-5): Basic knowledge of monetary policy and/or one stakeholder perspective; limited use of the case study evidence; little balance or evaluation; basic QWC.
Level 2 (6-10): Sound knowledge and understanding covering at least two of the three perspectives (households, firms, government) with relevant use of case study evidence (e.g. Table 2 figures); some balanced discussion of effectiveness and limitations; satisfactory use of specialist vocabulary; satisfactory QWC.
Level 3 (11-15): Detailed, well-developed critical examination covering all three perspectives (households, firms, government), explicitly grounded in the case study evidence and the specific cost-push nature of the inflation described; a balanced weighing of effectiveness against the limitations of using a demand-side tool against a supply-side problem; a substantiated overall conclusion; confident use of specialist vocabulary; high standard of QWC with a well-organised, coherent response.

The (short-run) Phillips curve is based on the observed historical inverse relationship between the rate of unemployment and the rate of inflation: when a government (or central bank) uses expansionary demand-side policy, such as cutting interest rates or increasing government spending, aggregate demand increases, which, moving along the short-run aggregate supply curve, tends to raise both real output and the price level; higher output typically requires firms to take on more workers, reducing unemployment, but the resulting rise in the price level means inflation increases at the same time. Conversely, contractionary demand-side policy aimed at reducing inflation, such as raising interest rates, tends to reduce aggregate demand, lowering the price level but also reducing output and raising unemployment. This suggests that, using demand-side policy alone, a government does indeed face a trade-off and cannot achieve very low inflation and very low unemployment simultaneously in the short run.

However, several factors limit the extent to which this trade-off constrains government policy in practice. First, well-designed supply-side policies, such as improving education and skills, reducing regulation, or improving infrastructure, can shift the long-run (and short-run) aggregate supply curve to the right, which can increase real output and reduce unemployment (structural rather than cyclical unemployment in particular) without necessarily requiring a corresponding rise in aggregate demand or the price level; in principle, this allows a government to improve both inflation and unemployment outcomes simultaneously over the longer term, rather than simply trading one off against the other, effectively 'escaping' the short-run Phillips curve trade-off by shifting the whole relationship.

Second, the case of cost-push or 'stagflationary' shocks, such as a sharp rise in global energy prices, illustrates that inflation and unemployment can sometimes rise together rather than trade off against one another: a leftward shift in short-run aggregate supply raises the price level (higher inflation) while simultaneously reducing real output and raising unemployment, breaking down the simple inverse Phillips curve relationship entirely, since neither expansionary nor contractionary demand-side policy alone can simultaneously fix both problems arising from a supply-side shock. This suggests that the nature of the shock or policy in question, and not simply the existence of a demand-side trade-off, determines the true extent of the constraint government policy faces.

In conclusion, the short-run Phillips curve trade-off does meaningfully constrain a government's ability to use demand-side policy alone to achieve very low inflation and very low unemployment at the same time, and policymakers must generally accept some compromise between these two objectives when relying solely on fiscal or monetary policy. However, the trade-off is not absolute: supply-side policies offer a route to improving both objectives simultaneously over the longer run by shifting aggregate supply, while cost-push shocks demonstrate that inflation and unemployment can also rise together, meaning that whether a genuine trade-off exists, and how severe it is, depends heavily on the source of the economic problem and the range of policy tools a government is willing and able to use, rather than on the simple original Phillips curve relationship alone.

Level 1 (1-7): Basic knowledge of the Phillips curve and/or macroeconomic objectives; limited analysis of the trade-off; largely one-sided or descriptive; little use of economic terminology; basic structure.
Level 2 (8-14): Sound knowledge and understanding of the short-run Phillips curve trade-off with AD-AS-based analysis of why it arises; some developed discussion of at least one limitation to the trade-off (e.g. supply-side policy or cost-push shocks); some balance; appropriate use of specialist vocabulary.
Level 3 (15-20): Detailed, well-developed analysis of the Phillips curve trade-off using AD-AS reasoning, explicitly balanced against both the role of supply-side policy in escaping the trade-off and the way cost-push/stagflationary shocks can break the relationship down; a substantiated, well-reasoned overall judgement on the extent of the constraint; confident, wide-ranging use of specialist economic vocabulary; coherent, well-structured response with high standard of QWC.