Economics 9708 · syllabus 3
Cambridge A Level Economics 9708 — Government microeconomic intervention (AS Level) topical past papers
Why governments step into markets and what happens when they do: maximum and minimum prices, indirect taxes, subsidies, direct provision and policies on inequality.
- Questions
- 572
- Years
- 2002–2026
- With mark scheme
- 99%
- Questions 2022–2026
- 186
Anyone can browse these pages. Opening the questions and their mark schemes takes a free Momentum account.
What Government microeconomic intervention (AS Level) covers
Governments intervene when markets do not deliver what society wants. A free market may provide no public goods at all, because no one can be made to pay for them; it tends to underconsume merit goods such as education and overconsume demerit goods such as tobacco, because consumers lack full information about their benefits and harms; and it may leave prices unstable or incomes very unequal. The tools include price controls, indirect taxes, subsidies and the direct provision of goods and services, and each has costs and unintended consequences as well as intended effects.
A maximum price set below the equilibrium price creates excess demand, so the good must be rationed by queues, ballots or sellers' choice, and a black market can develop; a minimum price set above equilibrium creates excess supply, which the government may have to buy up. A specific tax shifts the supply curve vertically upwards by the tax per unit, and an ad valorem tax pivots it upwards; either way consumers pay a higher price, producers keep a lower one, less is traded, and the more price inelastic side of the market bears more of the tax. A subsidy to producers shifts supply downwards, lowering the price and raising output, at a cost to the government of the subsidy per unit times the quantity sold.
Income is a flow received over a period; wealth is the stock of assets owned at a point in time, and both can be very unequally distributed. Governments narrow the gaps with progressive taxes, transfer payments such as unemployment benefits and pensions, state provision of services such as education and healthcare, and measures such as a national minimum wage, each with possible costs to incentives. This is AS content, examined on Papers 1 and 2, and the A Level topic on government microeconomic intervention returns to market failure, government failure and redistribution in more depth.
In the syllabus
The headings this topic has in the Cambridge International 2026–2028 syllabus, as the board prints them.
- 3 Government microeconomy intervention (AS Level)
- 3.1 Reasons for government intervention in markets
- 3.2 Methods and effects of government intervention in markets
- 3.3 Addressing income and wealth inequality
What you should be able to do
- Explain why governments intervene in markets, including public goods, merit and demerit goods and information failure
- Analyse the effects of maximum and minimum prices on a diagram, including shortages, surpluses and black markets
- Show the effect of specific and ad valorem taxes on supply, and calculate the shares paid by consumers and producers and the government's revenue
- Analyse a producer subsidy, including its effects on price and output and its cost to the government
- Distinguish income from wealth, and explain how progressive taxes, transfer payments and state provision affect inequality
- Evaluate intervention by weighing its intended effects against its costs and unintended consequences
Key ideas
- A maximum price has an effect only if it is set below the equilibrium price; a minimum price only if it is set above it
- Specific tax: a fixed amount per unit, shifting supply up in parallel; ad valorem tax: a percentage of the price, so the vertical gap grows as price rises
- The more price inelastic demand is relative to supply, the larger the share of an indirect tax paid by consumers
- Tax revenue = tax per unit × quantity sold after the tax; cost of a subsidy = subsidy per unit × quantity sold after the subsidy
- Progressive tax: the proportion of income paid in tax rises as income rises; regressive: it falls; proportional: it stays the same
- Income is a flow of earnings over a period; wealth is the stock of assets held at a point in time
How Government microeconomic intervention (AS Level) has been examined
From 2022 to 2026, Government microeconomic intervention (AS Level) was on Paper 2 · AS Level Data Response and Essays in 13 of 14 exam series, worth about 29% of that paper’s marks.
| Paper | Questions | Share of marks | Series |
|---|---|---|---|
| Paper 1 · AS Level Multiple Choice | 137 | 13% | 14 of 14 |
| Paper 2 · AS Level Data Response and Essays | 49 | 29% | 13 of 14 |
Momentum’s own count, over the questions in its bank for these years: a series is one exam session, every zone included, and a question filed under two chapters counts in both. Median marks per question: 1. The bank files this topic together with neighbouring ones, so these figures count every question in its chapters, including some on those topics.
Filed in Momentum under: Government Microeconomic Intervention.
A worked example
A market clears at $10 a unit with 1000 units sold each week. The government imposes a specific tax of $3 a unit, after which consumers pay $12 and 800 units are sold. Find the price producers now receive, the share of the tax paid by consumers and by producers, and the government's weekly tax revenue.
- Price producers keep = price consumers pay − tax = $12 − $3 = $9
- Consumers pay $12 − $10 = $2 more per unit, two-thirds of the tax
- Producers keep $10 − $9 = $1 less per unit, one-third of the tax
- Tax revenue = tax per unit × quantity after the tax = $3 × 800 = $2400 a week
- Check: consumers pay $2 × 800 = $1600 and producers $1 × 800 = $800, which add up to $2400
- Consumers bear the larger share, which shows that demand is less price elastic than supply over this range
Answer: Producers receive $9; of the $2400 weekly revenue, consumers pay $1600 (two-thirds) and producers $800 (one-third)
Written by Momentum for this page, with its own numbers; it is not taken from a past paper.
Mistakes that cost marks
- Drawing a maximum price above the equilibrium price and describing a shortage — a ceiling above equilibrium does not bind; it must be below equilibrium to have any effect
- Saying the price rises by the full amount of a tax — that happens only if demand is perfectly inelastic or supply perfectly elastic; normally consumers pay part through a higher price and producers bear the rest
- Shifting the demand curve for a tax on producers — the tax adds to the cost of supplying each unit, so it is the supply curve that shifts
- Calculating tax revenue with the quantity sold before the tax — the government collects the tax only on the smaller quantity sold after it
- Calling an indirect tax progressive because the rich spend more — a tax on spending takes a larger share of a poor household's income than of a rich one's, so it is usually regressive
Exam technique
- In multiple-choice questions on taxes and subsidies, read the incidence from the diagram: the consumers' share is the rise in the price they pay, the producers' share the fall in the price they keep, and the vertical gap between the two supply curves is the tax per unit
- Label every diagram fully — both supply curves, the old and new prices and quantities, the tax or subsidy per unit — and shade any area you refer to, such as the government's revenue
- In data-response answers, use the source to judge whether a policy worked, citing the change in consumption, the price or any sign of a black market, rather than describing what the policy was meant to do
- In essays, evaluate by saying what the outcome depends on, such as the price elasticity of demand, the level at which a price is set or the cost of enforcement, and reach a judgement rather than listing advantages and disadvantages
Practising in Momentum
- Every question in a chapter as one list, from every paper and year in the bank, newest first or shuffled.
- Each question turns over to its own part of the mark scheme, where the board published one.
- Narrow by paper, year, session, zone and marks, and star the questions worth keeping.
- Pick chapters, a number of questions and a time, and the exam builder draws a mock to sit and mark.
Past-paper questions and mark schemes are the copyright of Cambridge International. Momentum shows them to signed-in learners for revision and does not publish them on these pages.