Economics · Year 13

Active learning ideas

Game Theory and Oligopoly Behavior

Active learning turns abstract payoff matrices and Nash equilibria into lived experience. When students role-play firms or resolve dilemmas themselves, they feel the tension between cooperation and self-interest that defines oligopoly behavior.

• National Curriculum Attainment Targets
• A-Level: Economics - Market Structures
• A-Level: Economics - Oligopoly and Game Theory

• 20–45 min
• Pairs → Whole Class
• 4 activities

Activity 01

• Simulation Game
• 30 min · Pairs

Pairs Activity: Prisoner's Dilemma Rounds

Pair students as rival firm CEOs. Each round, they secretly choose 'cooperate' (high price) or 'defect' (cut price) via cards, then reveal and score payoffs from a shared matrix. Repeat 5-7 rounds, tracking cumulative profits and discussing shifts after feedback.

Explain how the Prisoner's Dilemma illustrates the challenges of cooperation in an oligopoly.

Facilitation Tip

During the Pairs Activity, circulate and quietly ask each pair to articulate the payoff for mutual silence versus one partner defecting so they verbalize the dilemma before writing it down.

What to look for

Present students with a simplified payoff matrix for two competing coffee shop chains deciding whether to advertise. Ask them to identify the Nash Equilibrium and explain why each firm chooses that strategy, referencing their own potential gains or losses.

• Apply
• Analyze
• Evaluate
• Create
• Social Awareness
• Decision-Making

Activity 02

• Simulation Game
• 45 min · Small Groups

Small Groups: Oligopoly Pricing Simulation

Form groups of 3-4 as competing firms. Each decides secretly on price levels or advertising spend, submits to teacher, who announces market outcomes and group profits based on a kinked demand model. Run 4 rounds, then debrief interdependence.

Predict the likely outcomes of price wars and non-price competition in an oligopoly.

Facilitation Tip

For the Oligopoly Pricing Simulation, seed the room with slightly different cost structures so groups discover why identical firms collude while asymmetrical ones destabilize.

What to look for

Facilitate a class discussion using the prompt: 'Imagine you are the CEO of a major smartphone manufacturer. What are the biggest challenges in maintaining stable prices and avoiding a price war with your main competitors, and what strategies could you employ to encourage cooperation?'

• Apply
• Analyze
• Evaluate
• Create
• Social Awareness
• Decision-Making

Activity 03

• Simulation Game
• 25 min · Whole Class

Whole Class: Strategy Vote and Debate

Present oligopoly scenarios like a price war threat. Students vote individually on strategies (collude, compete on quality, etc.), then debate in plenary why votes cluster and predict long-term results using game theory.

Evaluate the effectiveness of different strategies firms can employ to achieve stable outcomes in an oligopoly.

Facilitation Tip

In the Strategy Vote and Debate, require every speaker to reference data from their own payoff matrix before offering a policy suggestion.

What to look for

Provide students with a scenario of two identical firms considering a joint investment in a new, expensive advertising campaign. Ask them to write down: 1. The likely outcome if both firms invest. 2. The likely outcome if neither invests. 3. The temptation for one firm to free-ride on the other's investment.

• Apply
• Analyze
• Evaluate
• Create
• Social Awareness
• Decision-Making

Activity 04

• Simulation Game
• 20 min · Individual

Individual: Payoff Matrix Customization

Provide blank matrices; students alter payoffs for scenarios like entry threats. Calculate Nash equilibria alone, then share one insight with a partner for peer check.

Explain how the Prisoner's Dilemma illustrates the challenges of cooperation in an oligopoly.

What to look for

Present students with a simplified payoff matrix for two competing coffee shop chains deciding whether to advertise. Ask them to identify the Nash Equilibrium and explain why each firm chooses that strategy, referencing their own potential gains or losses.

• Apply
• Analyze
• Evaluate
• Create
• Social Awareness
• Decision-Making

A few notes on teaching this unit

Teachers know students grasp game theory when they stop asking ‘What should I do?’ and start asking ‘What will the other player do?’. Begin with the simplest matrix, let the tension build, then gradually add rounds or incomplete information to mirror real markets. Avoid rushing to solutions; the ‘aha’ moment arrives when students see their own defection reflected back at them.

Successful learning shows when students can construct and read matrices, articulate why mutual best responses stabilize outcomes, and propose real-world tactics like advertising campaigns or excess capacity to sustain cooperation.

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Watch Out for These Misconceptions

• During the Prisoner's Dilemma Rounds, watch for students claiming firms can sustain perfect collusion forever.

  Stop the simulation after round three and ask each pair to tally their total profits; the presence of at least one defection usually appears, prompting a class discussion on the need for repeated-game punishments.

• During the Oligopoly Pricing Simulation, listen for students asserting that price competition always eliminates weaker rivals.

  Have groups graph their demand curves after price cuts and ask them to explain why profits plateau, leading them to identify kinked demand and stable low-profit equilibria.

• During the Small Groups discussion of imperfect information, hear students assume game theory only works with full data.

  Provide an incomplete payoff matrix and ask groups to fill gaps based on observed patterns, showing how nuanced strategies emerge even with uncertainty.

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Methods used in this brief

• Simulation Game