Government interventions where markets fail (internal report)
Internal 5 credits Externalities Public goods Imperfect information Equity vs efficiency Merit goodsThe standard names SIX situations where a market fails to deliver efficient or equitable outcomes — consumption externalities, production externalities, public goods, imperfect information, inequitable income/wealth distribution, and under-provision of a merit good/service — each with its OWN matching interventions. Achieved explains why the market fails, the intervention, and its implications for equity AND efficiency, with a model; Merit does all three in DETAIL; Excellence uses the detailed explanation to make a JUSTIFIED RECOMMENDATION on which intervention is better, integrating a model.
1 Reading the notation
The six market-failure situations, and the explain/detail/justify-and-recommend ladder.📖 Terms the schedule grades you on
4 terms- The six situations
- Consumption externalities, production externalities, public goods, imperfect information, inequitable income/wealth distribution, under-provision of a merit good/service.
- Achieved
- Explain WHY the market fails, the intervention, and implications for equity AND efficiency — with a model.
- In-depth (Merit)
- The same three elements, in DETAIL, with a model supporting the detailed explanation.
- Comprehensive (Excellence)
- A JUSTIFIED RECOMMENDATION on which of (at least) two interventions is better for efficiency AND equity, with a model integrated into the recommendation.
2 Externalities: consumption and production
Same toolkit — subsidies, taxes, regulations, property rights, government provision — applied to two different spillover points. Exam-style A negative production externality: a factory's untreated waste-water discharge Explain why the market fails, and evaluate a tax versus a regulation. WHY THE MARKET FAILS: the factory's private cost of production excludes the cost the discharge imposes on downstream users — the market price does not reflect the full SOCIAL cost, so the market OVERproduces relative to the efficient quantity. INTERVENTION A — a per-unit tax on the factory's output: raises the firm's private cost toward the social cost, reducing output toward the efficient level; revenue could fund clean-up. INTERVENTION B — a regulation capping discharge volume: directly limits the externality regardless of output level, but does not generate revenue and may be costly to monitor and enforce. EQUITY: the tax raises the factory's costs (potentially passed to consumers); the regulation constrains the firm directly without raising prices — a different distribution of who bears the burden. JUSTIFIED RECOMMENDATION (Excellence): the regulation more directly targets the actual harm (discharge volume) regardless of how efficiently the firm can reduce output-linked pollution, so it is the stronger efficiency tool here — provided monitoring costs are not prohibitive. ✓ Two interventions, each evaluated for BOTH efficiency and equity, then a reasoned choice — that is the exact Excellence-level structure the standard names.3 Public goods
Non-rival, non-excludable, free-rider problem — and only ONE named intervention.The chain to state explicitly
- NON-RIVAL: one person's use does not reduce what is available to others.
- NON-EXCLUDABLE: nobody who does not pay can be stopped from using it.
- FREE-RIDER PROBLEM: since no one can be excluded, no one has an incentive to pay voluntarily.
- The private market therefore UNDER-PROVIDES or fails to provide at all — the standard names GOVERNMENT PROVISION as the intervention.
4 Imperfect information
Buyers/sellers cannot make efficient decisions without the missing information — regulation fixes the gap directly. ✕Reaching for a tax or subsidy instead of regulation
The standard names REGULATION specifically for imperfect information — typically mandatory disclosure, labelling or standards. A tax or subsidy changes incentives around a price but does not fix the underlying information gap itself.5 Inequitable distribution, and under-provision of a merit good
Two more named situations, each with its own toolkit.| Situation | Standard's named interventions |
|---|---|
| Inequitable income/wealth distribution | Progressive taxes, welfare benefits, collective provision, minimum wage |
| Under-provision of a merit good/service | Collective provision, government grants, targeted services |
Both list "collective provision" — the distinction is the AIM: redistributing income/wealth versus ensuring adequate access to a specific good or service.
6 Evaluating for equity AND efficiency
Both are required — an intervention rarely improves both without a trade-off.What each evaluation needs
- EQUITY: who bears the cost, who gets the benefit, against a stated standard of fairness.
- EFFICIENCY: does it move quantity toward the socially optimal level, and at what cost.
- Name the TRADE-OFF explicitly if the intervention improves one at the expense of the other.
Practice
Recall it first, then use it — testing yourself builds the memory, where rereading the notes above only feels easier.
Recall and application shuffled together — you have to work out what each item wants before you can answer it, which is the part the exam actually tests. Both kinds feed the same spacing schedule, so anything you miss comes back sooner.
Say the answer out loud before flipping — that attempt is where the learning happens, even when you get it wrong.
Exam-style only. Instant feedback, shuffled each attempt, best score saved on this device.