Cambridge A Level Economics: Permits, property rights, nudges, government failure (9708) – Revision Notes

These notes condense part of section 8.1.1 and all of 8.1.2 of the Cambridge International AS & A Level Economics 9708 syllabus for examination in 2026, 2027 and 2028. Topic 8 belongs to the A Level part of the syllabus (topics 7 to 11), not to AS. Explanations and fuller worked examples are in the study guide, and testing comes from the practice questions. Related pages: reasons for intervention and methods of microeconomic intervention. See also the course hub, the checklist and the free diagnostics. All figures are made up.

Key definitions

Term	Meaning
Pollution permit	A right to emit a set amount, issued within a cap and tradable
Cap	The legal limit on total emissions
Marginal abatement cost	The extra cost of cutting one more unit of pollution
Property right	Legally enforceable ownership of, or control over, a resource
Open access	A resource anyone can use, so no user bears the cost imposed on others
Nationalisation	Transfer of ownership from private owners to the state
Privatisation	Transfer of ownership from the state to private owners
Nudge	A change to choice architecture that steers behaviour without banning options or relying mainly on price
Choice architecture	How options are presented: defaults, order, framing, effort needed
Government failure	Intervention that leads to a misallocation of resources, so the net welfare gain is smaller than it could be or becomes a net welfare loss, or that creates new problems

Pollution permits

Method in steps:

1. Government sets the cap and issues permits equal to it.
2. Firms with high abatement costs buy permits. Firms with low costs cut and sell.
3. Trading continues until every firm’s marginal abatement cost equals the permit price.
4. The cap is met at the lowest total cost.

Reminder example. Three factories, each 120 tonnes, cap 240, permits 80 each. Abatement costs per tonne: 50, 30, 10. No trading: total cost 3,600. Trading: the 10 and 30 factories cut 100 and 20 tonnes, total cost 1,600, saving 2,000, price 30.

Strengths: cap fixes total pollution, cheapest cuts happen first, firms keep cutting if they can sell spare permits, auctions raise revenue.

Weaknesses: regulator must set the cap without full information, price instability, free allocation favours existing firms, hot spots, hoarding, monitoring cost.

Property rights

Method: identify the missing right, say who should hold it, show how ownership makes the owner bear the cost of overuse.

Reminder example. Forest, cost 40 per woodcutter, 2 per log. Open access: 6 woodcutters, net revenue 0. Efficient: 3, because the last one’s extra revenue (44) beats cost (40) and the next (36) does not. Net revenue 36.

Rule of thumb: open access stops where revenue per unit of input equals cost. Efficiency stops where extra revenue equals cost.

Other uses: patents and copyright reward invention. Rights can support bargaining, as long as bargaining costs are low and parties are few.

Limits: hard to define for moving resources, costly to enforce, unequal initial allocation, rights over ideas can create monopoly power.

Nationalisation and privatisation

	Nationalisation	Privatisation
Typical case	Natural monopoly, strategic industry, merit good	Loss-making or inefficient state firm
Possible gains	Pricing nearer marginal cost, keeps socially useful services	Profit motive, cost discipline, revenue, competition
Possible losses	Political interference, weak cost control, taxpayer burden	Higher price, lower output if monopoly continues, neglected unprofitable services

Reminder example. Demand P = 100 - Q, MC = 20, fixed cost 600. State pricing at MC: Q = 80, P = 20, loss 600. Private monopoly: Q = 40, P = 60, profit 1,000, deadweight loss 800.

Key point: competition and market structure matter at least as much as who owns the firm.

Provision of information

Link to failure: consumers lack information or misjudge it, so private benefit differs from true benefit.

Effect: for a demerit good, information shifts demand left; for a merit good, it shifts demand right.

Evaluation prompts: cost, speed, freedom of choice, ignored by addicted or short-sighted consumers, effects fade, no help against third-party harm.

Cost-effectiveness reminder. Cost divided by units of consumption avoided. Campaign costing 2,000,000 that avoids 30,000 units costs 66.67 per unit.

Behavioural insights and nudge theory

Behavioural insight	Example nudge
Inertia and defaults	Opt-out pension enrolment
Herd behaviour	Message comparing your use with neighbours
Salience and framing	Healthy food at eye level, clear warnings
Present bias	Commitment schemes, reminders
Effort	Simplified forms

Reminder example. Opt-in enrolment 40% of 2,000 workers (800). Opt-out 85% (1,700). Extra 900, a rise of 112.5%, or 45 percentage points.

Strengths: low cost, keeps choice, can be tested. Limits: effect size, durability, little force against large externalities, ethical worries about manipulation.

Government failure

Causes, each with a short link to a policy:

• Imperfect information: cap or tax set at the wrong level.
• Administrative cost and bureaucracy: enforcing a permit scheme costs more than expected.
• Political pressures: short-term popular choices, lobbying, regulatory capture.
• Unintended consequences: black markets, avoidance.
• Time lags: policy arrives after conditions have changed.

Consequences: net welfare loss, higher costs for taxpayers, weaker incentives to innovate, new inequities, lost trust.

Reminder example. MAC = 4q, MSB = 120 - 2q. Efficient cut 20 (net benefit 1,200). Ordering 30 gives net benefit 900, a welfare loss of 300. Ordering 12 gives 1,008, a loss of 192.

Evaluation rule: weigh the policy error against the original market failure. A badly aimed policy can still beat doing nothing if the market failure is large.

Evaluation toolkit

For any policy in this unit, test it against four questions: how large is the market failure being tackled, how well can the government measure it, what does the policy cost to run, and who gains or loses. Finish with a verdict that turns on a stated condition, such as the strength of competition, the accuracy of the cap, or how many people respond to a nudge.

Must-know distinctions

• Cap and trade fixes the quantity of emissions and lets the price move.
• Open access (no owner) differs from private property (one owner who bears the cost).
• Nationalisation moves ownership toward the state. Privatisation moves it away.
• Percentage change differs from percentage-point change.
• A nudge differs from a ban, a tax and a subsidy, because it leaves choice and prices largely unchanged.
• Market failure is a market outcome. Government failure is a policy outcome.

Quick self-test

1. Define a tradable pollution permit.
2. Two firms must each cut 10 units. Firm X cuts at 6 per unit, firm Y at 2 per unit, and Y can cut up to 20. Find the total cost without trading, with trading, and the saving.
3. Between which two values must the permit price lie in question 2?
4. Give one reason why an open-access resource is overused.
5. Distinguish nationalisation from privatisation.
6. A donor-registration default raises registration from 30% to 54% of 10,000 adults. Find the change in registrants, the percentage change and the percentage-point change.
7. A campaign costs 90,000 and avoids 3,000 units of consumption. Find the cost per unit avoided.
8. Define government failure.
9. State two causes of government failure.
10. State one consequence of government failure.

Answers

1. A right to emit a set amount of pollution within a government cap, which the holder can sell to others.
2. No trading: 10 x 6 + 10 x 2 = 80. Trading: Y cuts 20 at 2 = 40, X cuts 0. Saving 40.
3. Between 2 and 6, Y’s and X’s marginal abatement costs. Since Y can cut 20, X buys 10 permits, and any price from 2 to 6 leaves both better off or equal.
4. Each user ignores the cost their use imposes on others, so no one has an incentive to limit use.
5. Nationalisation moves ownership from private owners to the state. Privatisation does the reverse.
6. Registrants rise from 3,000 to 5,400, an extra 2,400. Percentage change is 2,400 / 3,000 = 80%. Percentage-point change is 24.
7. 90,000 / 3,000 = 30 per unit.
8. Intervention that leads to a misallocation of resources, so the welfare gain is smaller than it could be or becomes a loss, or that creates new problems.
9. For example: imperfect information, and political pressures such as lobbying.
10. For example: net welfare loss, or higher costs for taxpayers.

Where marks are usually lost

• Stating that permits ban pollution, rather than cap it and allow trading.
• Giving a price for the permit with no link to the marginal cutter.
• Treating privatisation as a cure for monopoly when the market structure is unchanged.
• Writing about all property rights as if they were easy to enforce.
• Mixing up percentage change and percentage-point change in default-option questions.
• Calling any unpopular policy a government failure.
• Evaluation points that are generic and not tied to the market in the question.
• Describing a nudge as compulsory, or as a price change.
• Leaving out the units or the working in a calculation.

Official syllabus

Cambridge International AS & A Level Economics 9708, syllabus for examination in 2026, 2027 and 2028, Cambridge University Press & Assessment. Sections covered: 8.1.1 (pollution permits, property rights, nationalisation and privatisation, provision of information, behavioural insights and nudge theory) and 8.1.2.