Cambridge International AS and A Level Economics: Permits, property rights, nudges, government failure (9708)

This guide covers 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: pollution permits, property rights, nationalisation and privatisation, provision of information, behavioural insights and nudge theory, and government failure. According to the syllabus, AS Level covers topics 1 to 6 and A Level adds topics 7 to 11, so topic 8 is A Level only. AS content is assumed knowledge. Taxes, subsidies, controls and quotas sit in a separate unit. The countries, firms and numbers here are made up for teaching.

Pair it with the revision notes and the practice questions. Background reading: reasons for government intervention and methods of microeconomic intervention. Also see the course hub, the printable checklist and the free diagnostics.

What this unit covers

Section	Statement	You must be able to
8.1.1	Pollution permits	Explain how a cap and tradable permits work, and judge their effectiveness
8.1.1	Property rights	Explain how defining and enforcing ownership corrects market failure
8.1.1	Nationalisation and privatisation	Compare public and private ownership as a response to market failure
8.1.1	Provision of information	Explain how better information changes decisions, and its limits
8.1.1	Behavioural insights and nudge theory	Explain how changing choice architecture alters behaviour
8.1.2	Government failure	Define it, give causes, and analyse consequences

For each policy ask which market failure it targets, what change in behaviour it relies on, what it costs to run and what could go wrong. That sequence builds analysis and evaluation.

Pollution permits

What it is. The government sets a cap on total emissions, issues permits that add up to the cap, and lets firms trade them. A firm emitting more than its permits covers must buy more or cut emissions. A firm that cuts below its allowance can sell the spare permits.

Why it works. Firms differ in how costly it is to cut pollution. A firm with a high marginal abatement cost prefers to buy permits. A firm with a low cost prefers to cut and sell. Trading moves the cuts to the cheapest sources, so the cap is met at the lowest total cost.

Worked example (illustrative). In Country A, three factories each emit 120 tonnes a year. The cap is 240 tonnes, so 80 permits go to each factory and 120 tonnes must be cut. Marginal abatement costs are constant: factory A 50 dollars a tonne, factory B 30 dollars, factory C 10 dollars. Factory C can cut at most 100 tonnes.

No trading: each cuts 40 tonnes
  A: 40 x 50 = 2,000   B: 40 x 30 = 1,200   C: 40 x 10 = 400
  Total cost = 3,600

Trading: cuts go to the cheapest first
  C cuts 100 (cost 1,000), B cuts 20 (cost 600), A cuts 0
  Total cost = 1,600     Saving = 2,000

Permit price settles at 30
  A buys 40 permits (pays 1,200, against 2,000 to cut)
  B buys 20 permits (pays 600, plus 600 to cut: no gain, no loss)
  C sells 60 permits (receives 1,800 for cutting 100 tonnes at 1,000)

Buyers and sellers trade 60 permits, so the cap holds at 240 tonnes. The price is 30 dollars because B is the marginal cutter: below 30 dollars B would rather buy than cut, and demand would exceed supply.

Diagram in words. Put marginal abatement cost on the vertical axis and emissions on the horizontal. Each firm’s cost curve slopes upward as emissions fall. The permit price is the common height at which every firm that cuts is on its own curve.

Evaluation.

• Certainty of the outcome: the cap fixes total emissions, but the permit price is uncertain and may swing, which makes investment planning harder.
• The regulator must choose the cap without knowing true abatement costs or the true external cost. A cap set too loose gives little benefit. One set too tight imposes costs above the benefit.
• Initial allocation matters. Free permits favour existing polluters. Auctioning raises revenue the government can use.
• Large firms may hoard permits to block rivals, and pollution may concentrate in one locality.
• Monitoring and enforcement are costly, and cheating weakens the scheme.

Property rights

What it is. Many externalities arise because nobody owns the resource. Where a resource is open to all, each user ignores the cost their use imposes on others. Defining and enforcing property rights gives an owner an incentive to protect the resource, and lets those harmed bargain or claim compensation.

Worked example (illustrative). A forest in Country B is open to any woodcutter. A woodcutter costs 40 dollars a season to employ and logs sell at 2 dollars each.

Woodcutters	Total logs	Revenue (dollars)	Revenue per woodcutter	Extra revenue from last woodcutter	Net revenue after costs
1	30	60	60	60	20
2	56	112	56	52	32
3	78	156	52	44	36
4	96	192	48	36	32
5	110	220	44	28	20
6	120	240	40	20	0

With open access, woodcutters keep entering while revenue per woodcutter exceeds 40 dollars, so 6 work the forest and net revenue is zero. Each new woodcutter adds to their own harvest but reduces everyone else’s, a cost they ignore. The efficient number is 3, where the extra revenue from the last woodcutter (44 dollars) still exceeds the cost and a fourth (36 dollars) would not. Net revenue is then 36 dollars, the highest in the table. If one owner, a cooperative, or a tradable licence system controls the forest and limits woodcutters to 3, the overuse ends.

Other uses. Patents and copyright create property rights over ideas, so firms can earn a return on research that rivals could otherwise copy.

Evaluation. Rights are hard to define for air, oceans and wildlife that move. Enforcement and legal systems cost money. When the number of affected parties is large, bargaining costs can block agreement. Who receives the rights at the start affects fairness, as the owner gains the value. Rights over ideas can also create monopoly power and raise prices.

Nationalisation and privatisation

Definitions. Nationalisation transfers ownership of a firm or industry from private owners to the state. Privatisation transfers ownership from the state to private owners.

Why nationalise. A natural monopoly has such high fixed costs that one firm serves the market most cheaply. The state can pursue the public interest rather than profit, price nearer to marginal cost, keep unprofitable but socially useful services, and protect strategic industries.

Why privatise. Private owners face the profit motive and the risk of takeover or loss, which may cut costs. The sale raises revenue, and removes losses from the public budget. Opening the industry to rivals can add competition.

Worked example (illustrative). A water network in Country C has fixed cost 600 dollars (thousand) and constant marginal cost 20 dollars per unit. Demand is P = 100 - Q, with Q in thousands.

State, price = marginal cost: P = 20, so Q = 80
  Consumer surplus = 1/2 x 80 x 80 = 3,200
  Profit = (20 - 20) x 80 - 600 = -600  (needs a subsidy)

Private monopoly, MR = MC: 100 - 2Q = 20, so Q = 40, P = 60
  Consumer surplus = 1/2 x 40 x 40 = 800
  Profit = (60 - 20) x 40 - 600 = 1,000
  Deadweight loss = 1/2 x 40 x 40 = 800

Privatising a natural monopoly without changing market structure shifts 1,000 dollars of profit to owners, cuts output from 80 to 40 and loses 800 dollars of welfare. The gain would have to come from lower costs. If private managers cut marginal cost sufficiently, the case strengthens.

Evaluation. Ownership matters less than competition. A private monopoly still has market power. A state firm may lack cost discipline, face political interference and have no incentive to innovate. Results depend on the starting efficiency of the firm and on how the sale is carried out.

Provision of information

Market failure arises when consumers lack information or misjudge it, for example underestimating the harm of a demerit good. Government can supply information through labels, warnings, campaigns and public data. If consumers act on it, the perceived benefit falls towards the true benefit. For a demerit good, the demand curve shifts left, reducing overconsumption.

Worked example (illustrative). In Country D, sales of a sugary drink are 500,000 units a month. After a health campaign costing 2,000,000 dollars, sales are 470,000.

Fall = 30,000 units = 30,000 / 500,000 = 6%
Cost per unit of consumption avoided = 2,000,000 / 30,000 = 66.67

A label costing 900,000 dollars that cuts sales by 12,000 units costs 75 dollars per unit avoided, so the campaign is more cost-effective on this measure.

Evaluation. Information is cheap and keeps freedom of choice. But addicted or short-sighted consumers may ignore it, effects fade, and it cannot stop pollution that harms third parties.

Behavioural insights and nudge theory

Standard theory assumes rational consumers. Behavioural economics notes that people use rules of thumb, favour the present, follow others, stick with defaults, and react to how choices are framed. A nudge changes the choice environment, or choice architecture, to steer people towards better decisions without banning options or changing prices much.

Common nudges: default options, social comparison messages, placing healthier items at eye level, reminders, and simple forms.

Worked example (illustrative). An employer has 2,000 workers. With opt-in pension enrolment, 40% join. With automatic enrolment and an option to leave, 85% stay in.

Opt-in: 0.40 x 2,000 = 800    Opt-out: 0.85 x 2,000 = 1,700
Extra members = 900
Rise = 900 / 800 = 112.5%     Change = 45 percentage points

If each member contributes 720 dollars a year (3% of 24,000 dollars), contributions rise by 900 x 720 = 648,000 dollars a year.

Evaluation. Nudges are low cost and preserve choice. Yet effects may be small or temporary, may not suit large externalities such as heavy pollution, and critics see them as manipulation. A nudge works best where people want the outcome but fail to act.

Government failure

Definition. Government failure occurs when intervention leads to a misallocation of resources, so the net welfare gain is smaller than it could be or turns into a net welfare loss, or when it creates new problems.

Causes. Imperfect information about costs and benefits. Administrative costs and bureaucracy. Political aims such as re-election, which favour short-term and visible policies. Lobbying and regulatory capture, where regulated firms influence the regulator. Unintended consequences, such as black markets. Time lags between problem and policy.

Worked example (illustrative). In Country E, the marginal abatement cost of cutting pollution is MAC = 4q and the marginal social benefit is MSB = 120 - 2q, where q is thousand tonnes cut.

Efficient cut: 4q = 120 - 2q, so q = 20, and MAC = MSB = 80
Net benefit at 20 = 120(20) - 20^2 - 2(20)^2 = 2,400 - 400 - 800 = 1,200
Regulator misjudges and orders 30 (still better than cutting nothing, which gives 0, but short of the best):
  MAC = 120, MSB = 60
  Net benefit = 3,600 - 900 - 1,800 = 900
  Welfare loss = 300 = 1/2 x 10 x 60
Orders only 12: net benefit 1,008, loss = 192

Consequences. Misallocated resources and lost welfare, higher costs for taxpayers, reduced incentives to innovate, black markets, and loss of trust in policy. Government failure does not mean doing nothing is better. Compare the size of the original market failure with the size of the likely policy error.

Common errors

• Writing that permits “ban” pollution. They cap it and allow trading.
• Confusing nationalisation with privatisation.
• Calling a nudge a tax or ban. A nudge leaves choice open.
• Describing government failure as the policy being unpopular, rather than a worse allocation.
• Listing evaluation points with no link to the context in the question.

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.