Contestable Markets and Market PowerActivities & Teaching Strategies
Contestable markets theory feels abstract to Year 13 students until they feel the pressure of potential competition firsthand. Active learning turns the invisible threat of hit-and-run entry into a tangible experience, making the link between theory and firm behavior clear through concrete roles and decisions.
Learning Objectives
- 1Analyze how the threat of new entrants influences the pricing strategies of incumbent firms in concentrated markets.
- 2Differentiate between actual market competition and potential competition in determining firm behavior and market outcomes.
- 3Evaluate the effectiveness of competition policy interventions based on the principles of contestable markets.
- 4Critique the assumptions underlying the theory of contestable markets, such as zero sunk costs and costless exit.
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Role-Play: Entry Threat Simulation
Divide class into incumbent firms and potential entrants. Incumbents set initial prices and outputs; entrants announce low-cost entry, prompting incumbents to adjust. Groups report decisions and rationale in plenary. Debrief links choices to theory.
Prepare & details
Analyze how the threat of entry can influence pricing and output decisions of incumbent firms.
Facilitation Tip: During the Entry Threat Simulation, circulate and challenge groups by asking one member to play the role of the incumbent firm and another to argue why their entry is credible, forcing students to confront sunk costs and exit barriers directly.
Setup: Chairs arranged in two concentric circles
Materials: Discussion question/prompt (projected), Observation rubric for outer circle
Case Study Analysis: Sector Analysis
Provide cases like UK energy markets. Groups identify sunk costs, entry barriers, and contestability level. They predict incumbent responses and CMA interventions. Share findings via gallery walk.
Prepare & details
Differentiate between actual competition and potential competition in shaping market outcomes.
Facilitation Tip: In the Sector Analysis case study, assign each group one industry and require them to present a two-minute pitch on whether it is contestable, using only the cost and technology data provided to prevent generic answers.
Setup: Groups at tables with case materials
Materials: Case study packet (3-5 pages), Analysis framework worksheet, Presentation template
Formal Debate: Policy Application
Split class into teams: one argues contestability should guide CMA over structure-conduct; other defends traditional metrics. Present evidence from cases, vote, and reflect on strengths.
Prepare & details
Assess the policy implications of contestable market theory for competition authorities.
Facilitation Tip: For the Debate on Policy Application, assign one student per team to act as the competition authority, ensuring policy relevance is always central to the arguments made.
Setup: Two teams facing each other, audience seating for the rest
Materials: Debate proposition card, Research brief for each side, Judging rubric for audience, Timer
Graphing: Response Curves
Individuals plot average cost, marginal cost, and demand curves. Shade entry threat zones, adjust for low sunk costs. Pairs compare and discuss pricing shifts.
Prepare & details
Analyze how the threat of entry can influence pricing and output decisions of incumbent firms.
Facilitation Tip: When students graph response curves in the Graphing activity, have them label each curve with the firm’s strategy so the visual output matches their strategic decisions in the simulation.
Setup: Chairs arranged in two concentric circles
Materials: Discussion question/prompt (projected), Observation rubric for outer circle
Teaching This Topic
Experienced teachers approach contestable markets by anchoring theory in lived experience—using simulations to make the threat of entry visceral and case studies to test assumptions against messy reality. Avoid over-reliance on graphs alone; students need to see how pricing and investment decisions change under threat, not just how curves shift. Research suggests that students grasp contestability faster when they repeatedly confront the same scenario from multiple angles: first as an incumbent deciding whether to raise prices, then as a potential entrant weighing costs, and finally as a policy maker judging outcomes.
What to Expect
Students will demonstrate understanding by explaining why incumbents price at average cost despite few actual rivals, by identifying key contestability conditions in real sectors, and by designing strategies that deter entry without actual competition. Evidence of learning appears in their role-play choices, case study justifications, and graph annotations.
These activities are a starting point. A full mission is the experience.
- Complete facilitation script with teacher dialogue
- Printable student materials, ready for class
- Differentiation strategies for every learner
Watch Out for These Misconceptions
Common MisconceptionDuring Entry Threat Simulation, watch for students assuming that contestability requires many actual competitors.
What to Teach Instead
Use the role-play to show how a single credible entrant can discipline the incumbent. After each round, ask groups to compare strategies: did the incumbent lower prices even though only one potential entrant existed?
Common MisconceptionDuring Sector Analysis, watch for students concluding that high sunk costs always eliminate contestability.
What to Teach Instead
Have groups classify costs in their assigned industry using the provided data. Ask them to calculate whether profits could cover entry costs in one year or two, forcing them to compare sunk costs with expected returns.
Common MisconceptionDuring Entry Threat Simulation, watch for students assuming incumbents ignore potential entrants without immediate action.
What to Teach Instead
Ask the incumbent team to present their pricing strategy at the start and after the threat is revealed. Listen for students who justify limit pricing even when no rival has entered yet.
Assessment Ideas
After Entry Threat Simulation, present students with the scenario about a dominant tech firm in online video streaming and ask them to explain how the threat of new entrants might influence the firm’s pricing and content acquisition strategies, referencing their simulation experience.
During Sector Analysis, ask students to identify two key assumptions of contestable market theory on a sticky note, then pair-share one industry where these assumptions hold and one where they do not, using their case study data to justify their choices.
After Graphing Response Curves, ask students to write on an index card one sentence defining 'hit-and-run entry' and one sentence explaining why low sunk costs are crucial for contestable markets, then list one policy implication for competition authorities derived from their graphs.
Extensions & Scaffolding
- Challenge: Ask students who finish early to design a counter-strategy for an incumbent facing a hit-and-run entrant in a market with zero sunk costs but high fixed costs.
- Scaffolding: Provide a partially completed cost table for students who struggle with the Sector Analysis case study to help them classify sunk versus variable costs.
- Deeper exploration: Invite students to compare contestable markets with monopolistic competition by graphing both scenarios side by side and explaining differences in firm behavior.
Key Vocabulary
| Contestable Market | A market where the threat of potential entry by new firms, even if no actual entry occurs, is sufficient to keep incumbent firms' behavior in check. |
| Hit-and-Run Entry | A short-term entry into a market by a new firm, aiming to make quick profits before the incumbent can respond, followed by a swift exit if necessary. |
| Sunk Costs | Costs that have already been incurred and cannot be recovered, such as specialized machinery or advertising campaigns, which can deter entry. |
| Barriers to Entry | Obstacles that make it difficult or impossible for new firms to enter a market, including high start-up costs, patents, or brand loyalty. |
| Potential Competition | The possibility that new firms might enter a market, influencing the decisions of existing firms even if no new firms are currently present. |
Suggested Methodologies
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