Topic 3: Types of markets and the role of government
Explain the different market structures (perfect competition, monopolistic competition, oligopoly, monopoly) and the role of government in regulating market conduct, including the ACCC and the Competition and Consumer Act 2010
A focused QCE Economics Unit 1 answer on market structures. Distinguishes perfect competition, monopolistic competition, oligopoly and monopoly with Australian examples, explains the role of the ACCC and the Competition and Consumer Act 2010, and analyses recent competition issues including the 2024 supermarket inquiry.
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What this dot point is asking
QCAA wants you to distinguish the four major market structures with Australian examples, explain the role of the ACCC and the Competition and Consumer Act 2010, and discuss recent competition issues. Expect short response in IA1 or the EA.
The answer
The four market structures
Market structures lie on a spectrum from most to least competitive.
1. Perfect competition.
- Large number of buyers and sellers.
- Homogeneous product.
- Free entry and exit.
- Perfect information.
- Firms are price takers: must accept the market price.
Examples: agricultural commodities (wheat, beef in world markets), foreign exchange markets, equity markets (close to perfect).
Outcome: allocative and productive efficiency in the long run. Zero economic profit because entry erodes any excess.
2. Monopolistic competition.
- Many firms.
- Differentiated products (real or perceived).
- Free entry and exit.
- Some market power from product differentiation.
Examples: restaurants, hairdressers, retail clothing, real estate agencies.
Outcome: firms earn normal profit in the long run, but products are differentiated and may not achieve full productive efficiency.
3. Oligopoly.
- Few large firms dominate.
- Strategic interaction (firms watch each other).
- Significant barriers to entry (scale economies, established brands, network effects).
- Products may be similar or differentiated.
Examples in Australia:
- Supermarkets: Coles and Woolworths control around 65 percent of grocery sales (ACCC 2024 inquiry).
- Banking: the four major banks (CBA, Westpac, ANZ, NAB) hold around 75 percent of deposits and mortgages.
- Airlines: Qantas and Virgin Australia together hold over 90 percent of domestic passenger volume.
- Telecommunications: Telstra, Optus and TPG/Vodafone in mobile.
- Petrol retail: four to five major chains.
Outcome: higher prices than under perfect competition. Strategic behaviour (collusion, price leadership, predatory pricing) may emerge.
4. Monopoly.
- A single firm controls the market.
- Significant barriers to entry (natural monopoly, patents, government licence).
- Firm is a price maker.
Examples:
- Australia Post (mail delivery, statutory monopoly).
- State water utilities (Sydney Water, Yarra Valley Water).
- Electricity transmission networks (TransGrid, AusNet Transmission).
- Australian Rail Track Corporation for interstate freight rail.
Outcome: higher prices, lower quantity, deadweight loss. May earn supernormal profit if not regulated.
Why market power matters
Market power leads to:
- Higher prices for consumers.
- Lower output than the socially optimal level.
- Allocative inefficiency (price exceeds marginal cost).
- Possible productive inefficiency (less pressure to minimise cost).
- Reduced innovation in some cases (though some argue large firms invest more in R&D).
- Inequality if profits accrue to capital owners.
The ACCC and the Competition and Consumer Act 2010
The Australian Competition and Consumer Commission (ACCC) is the national competition and consumer protection regulator, established 1995.
Functions:
- Enforcement of the Competition and Consumer Act 2010 (CCA).
- Merger review.
- Consumer protection (Australian Consumer Law).
- Industry-specific regulation (telecommunications, energy, ports).
- Market studies and reports.
The CCA prohibits:
- Cartels (price fixing, market sharing, bid rigging). Criminal penalties since 2009.
- Anti-competitive agreements.
- Misuse of market power.
- Mergers and acquisitions that substantially lessen competition.
- Exclusive dealing that substantially lessens competition.
- Resale price maintenance.
- Unconscionable conduct, misleading and deceptive conduct, and other consumer protection offences.
Recent competition issues
Supermarket inquiry (2024). The ACCC investigated Coles and Woolworths after complaints about pricing, supplier relations and grocery affordability. Recommendations included:
- Mandatory unit pricing.
- Stronger Food and Grocery Code.
- Greater transparency on margins.
- Reformed merger laws.
- Merger reform (2026)
- Mandatory pre-notification of large mergers (over $50 million turnover) from 1 January 2026, replacing the voluntary regime. ACCC has stronger powers to block anti-competitive mergers.
- Digital platforms inquiry (ongoing)
- Five interim reports (2019-2024) addressing the market power of Google, Meta and Amazon. Proposed mandatory codes of conduct and competition rules.
- Energy market review
- The ACCC monitors retail electricity competition and gas markets. Default Market Offer caps and price disclosure rules introduced after the 2018 inquiry.
- Banking and financial services
- Royal Commission (2017-2019) led to ASIC, APRA and ACCC reforms, including breaking up vertically integrated wealth management businesses.
Natural monopolies and regulation
Some industries are natural monopolies: high fixed costs and declining average cost mean a single firm produces more cheaply than competing firms.
Examples: electricity transmission, water pipes, rail track, NBN.
Policy response: keep as a single firm but regulate prices and access.
- Australian Energy Regulator (AER) sets transmission revenue allowances.
- National Access Regime under Part IIIA of the CCA allows third-party access to essential infrastructure.
- State pricing regulators (IPART in NSW, ESC in Victoria, QCA in Queensland) regulate water, transport.
Costs and benefits of competition
Benefits of competition:
- Lower prices for consumers.
- Productive efficiency (firms minimise cost).
- Allocative efficiency (price equals marginal cost).
- Innovation as firms compete on quality and new products.
- Consumer choice.
Concerns about excess competition:
- Race to the bottom on quality or safety.
- Predatory pricing by large incumbents to drive out entrants.
- Insufficient scale for fixed-cost industries.
The Australian framework balances these through the CCA: competition is the presumption, with carve-outs for natural monopolies and authorised cooperative arrangements.
Common QCE traps
- Treating all big firms as monopolies
- Coles and Woolworths are an oligopoly, not a monopoly. The distinction matters.
- Forgetting consumer protection
- The CCA covers both competition and consumer protection (unconscionable conduct, misleading conduct).
- Treating monopoly as always bad
- Natural monopolies can be efficient if well regulated. The right question is how to regulate, not whether to break up.
- Quoting old statistics
- Use the 2024 supermarket inquiry, 2024 merger reform, and recent digital platforms reports.
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