QCE Economics - Unit 2 - Markets and efficiency

Public goods, factor mobility and market power

Diagnose free riding, labour and capital immobility, monopoly and monopsony before selecting remedies.

Part of the free QCE Economics notes library for Unit 2: Markets and efficiency.

Updated 2026-08-13 - 6 min read

These failures break different links and require different evidence.

A pure public good is non-rival and non-excludable. Because beneficiaries can free ride, private providers may be unable to collect enough revenue even where total benefit exceeds cost. Government supply alone does not make a service a public good: classify rivalry and exclusion.

Factor immobility prevents labour, capital or land from moving quickly toward higher-valued uses. Occupational immobility can reflect specialised skills, licensing and retraining time. Geographic immobility can reflect housing, relocation, family and information constraints. Better matching information, portable qualifications and targeted adjustment support can expand feasible moves.

Market power is the ability to influence price or non-price terms. Monopoly is seller power; monopsony is buyer power. A regional town with one major employer can exhibit monopsony when workers have limited outside options. Measure switching costs, vacancies, mobility and wage-setting—not national product share alone.

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Classroom deep dive

The model in full

A pure public good is non-rival and non-excludable: one person's use does not meaningfully reduce availability and non-payers cannot feasibly be excluded. Individuals then have an incentive to free ride, so private suppliers may be unable to recover the social value and the market can be missing or undersized. Factor immobility prevents land, labour or capital moving toward higher-valued uses because of geography, skills, finance, information or time. Market power lets a seller or buyer influence price or terms, often restricting output, raising mark-ups or weakening quality and innovation pressure. These failures require different diagnoses and remedies.

Concepts your explanation must connect

1. Government provision does not make a good public, and public goods need not be provided only by government. Classification comes from rivalry and excludability under available technology and institutions.
2. Occupational labour immobility arises when skills are not transferable; geographical immobility arises when workers or capital cannot relocate. Training, housing, transport and credential rules can therefore affect allocation.
3. Market power is not identical to large size or high profit. Persistent barriers, limited substitutes and the ability to worsen price or quality without losing enough customers provide stronger evidence.

Construct the reasoning, one link at a time

1. Link 1: Test rivalry and excludability, mobility barriers and market constraints separately rather than labelling every undesirable result a public-good problem.
2. Link 2: Identify the missing incentive or blocked adjustment: free-rider finance, factor transition or competitive discipline.
3. Link 3: Trace the resulting under-provision, unemployment, capacity bottleneck, restricted output, higher price or reduced innovation to affected stakeholders.
4. Link 4: Match a response to the mechanism—collective finance, mobility support or competition/regulation—and assess targeting, cost and unintended effects.

After constructing the chain, inspect every arrow. An arrow should represent an incentive, accounting flow, behavioural response, curve movement or institutional constraint. If it represents only chronology, it has not yet explained the outcome. State the relevant market, decision-maker, time horizon and ceteris paribus condition where each matters.

Fully worked reasoning

Notice that the conclusion is narrower than the whole topic. It answers the supplied problem, preserves its units and assumptions, and does not convert a conditional model into a universal claim. In calculations, show the formula, substitution, working and unit. In graphs, label axes, original and new curves, equilibrium points and the direction of change.

Economic inquiry workshop

QCAA's inquiry process moves through forming, selecting, analysing and evaluating. Use that sequence rather than collecting data first and inventing a question later.

Form. Which mechanism best explains under-provision of a chosen regional service?

Select. Collect evidence on rivalry, exclusion technology, willingness to pay, fixed cost, workforce mobility, substitutes, entry barriers, price and quality.

Analyse. Build competing explanations and identify a discriminating observation—for example, whether provision persists when payment can be enforced or when skill constraints are removed.

Evaluate. Small regional samples and commercial confidentiality restrict inference. Use interviews with several stakeholder types and clearly separate measured facts from assumptions.

For every dataset, record publisher, exact series or table, units, observation period, release date, adjustment basis and revision status. Current evidence means the newest appropriate observation available—not merely a recently updated webpage. Triangulate the model with direct determinant evidence and at least one plausible competing explanation.

Misconception clinic

Repair: Crowding and gates can make parks rival or excludable; factors face skill, location and time constraints; power requires evidence about substitutes, barriers and conduct or outcomes.

A useful correction names the first broken definition or causal link, rebuilds from that point, and explains why the revised conclusion follows. Adding terminology to the original claim without changing its logic is not a repair.

Unfamiliar transfer

For broadband, defence, childcare or workforce shortages, run all three diagnostic tests before deciding which failure dominates and which intervention has a plausible mechanism.

Use this response frame:

1. Define the unfamiliar context and the relevant economic variable.
2. Reconstruct the model rather than copying the worked conclusion.
3. Calculate or graph the change with labels and units.
4. Trace the mechanism and identify a countervailing channel.
5. Evaluate against a named criterion for specified stakeholders and time horizons.
6. State which fresh evidence would resolve the remaining uncertainty.

Final verification: Use the correct defining properties, identify the broken incentive or adjustment path and match each proposed remedy to that exact failure rather than its surface symptom.

Syllabus mapping

This lesson explicitly addresses the following mapped QCAA statements:

• Explain the causes and effects of market failure, including the difference between public goods (e.g. fresh air, national security, street lighting) and private goods, why markets might not adequately provide public goods and the concept of the free rider problem
• Explain the causes and effects of market failure, including ways in which the immobility of factors of production might lead to the misallocation of resources.
• Explain the causes and effects of market failure in at least one of the following situations how market power may create a loss of market efficiencies

Sources

• QCAA, Economics 2025 v1.4 syllabus (March 2026)
• QCAA, Economics senior subject page
• QCAA, Economics 2025 v1.4 syllabus amendment report

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