Economics · Grade 12

Active learning ideas

Game Theory: Prisoner's Dilemma

Students need to feel the tension of strategic choices to grasp why the Prisoner's Dilemma is so powerful. Active learning turns abstract payoffs into concrete stakes, letting teenagers test their instincts through role-play and matrix work rather than passive notes.

• Ontario Curriculum Expectations
• CEE.EE.9.3
• CEE.EE.9.4

• 30–45 min
• Pairs → Whole Class
• 4 activities

Activity 01

• Simulation Game
• 35 min · Pairs

Pairs Role-Play: Airline Pricing Dilemma

Pair students as executives from two airlines. Each secretly chooses 'cooperate: keep high prices' or 'defect: cut prices.' Use printed payoff cards to reveal joint outcomes after both choose. Run 5 rounds, then pairs chart results and discuss incentives.

Construct a payoff matrix to represent a Prisoner's Dilemma scenario.

Facilitation Tip

In the repeated simulation, use a visible timer and a public scoreboard so students can track cumulative profits and see how trust shifts over rounds.

What to look for

Present students with a simplified payoff matrix for two competing coffee shops deciding on pricing. Ask them to identify the dominant strategy for each shop and explain the resulting Nash equilibrium. Then, ask if this outcome is Pareto optimal.

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

Activity 02

• Simulation Game
• 40 min · Small Groups

Small Groups: Payoff Matrix Construction

Provide oligopoly scenario like soft drink ad wars. Groups construct 2x2 matrices with payoffs based on cooperate/defect choices. Share matrices class-wide, vote on dominant strategies, and debate Nash equilibrium.

Analyze why the Prisoner's Dilemma often leads to a suboptimal outcome.

What to look for

Facilitate a class discussion using the prompt: 'Consider a scenario where two competing airlines must decide whether to invest in a costly new loyalty program. How might the Prisoner's Dilemma explain their strategic choices, and what factors could encourage cooperation or lead to an advertising-like 'loyalty program war'?'

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

Activity 03

• Simulation Game
• 45 min · Whole Class

Whole Class: Repeated Game Simulation

Divide class into two 'firms.' Use polls or hand signals for ad spend choices each round. Tally market shares on board, adjust based on history. Debrief on how repetition changes behavior from one-shot play.

Explain the relevance of the Prisoner's Dilemma to advertising wars or arms races.

What to look for

Students receive a scenario describing two competing smartphone manufacturers deciding on R&D investment. Ask them to: 1. Briefly describe the payoff structure. 2. State the likely outcome based on the Prisoner's Dilemma. 3. Explain why this outcome might not be the best for both companies combined.

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

Activity 04

• Simulation Game
• 30 min · Individual

Individual: Case Analysis Jigsaw

Assign real cases like arms races or cartels. Students diagram PD matrices individually, then jigsaw in groups to compare applications and solutions like binding agreements.

Construct a payoff matrix to represent a Prisoner's Dilemma scenario.

What to look for

Present students with a simplified payoff matrix for two competing coffee shops deciding on pricing. Ask them to identify the dominant strategy for each shop and explain the resulting Nash equilibrium. Then, ask if this outcome is Pareto optimal.

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

A few notes on teaching this unit

Teachers should start with a concrete example students recognize, like two smartphone makers choosing R&D budgets, then move to generic matrices. Avoid rushing to the Nash equilibrium; instead, let the class discover it through repeated trials. Research shows that repeated play helps students see the short-term gains of defection versus the long-term losses of a price war.

Successful students will move from seeing the dilemma as a puzzle to treating it as a tool for analyzing real decisions. They will explain why mutual defection becomes the predictable outcome, and they will connect this to business cases without prompting.

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Watch Out for These Misconceptions

• During the Pairs Role-Play: Airline Pricing Dilemma, watch for students assuming cooperation will always happen.

  After the first round, pause to ask each pair to report their profits and whether they could have done better by defecting, using their actual payoff numbers to redirect over-optimism.

• During Small Groups: Payoff Matrix Construction, watch for students equating Nash equilibrium with the best possible outcome.

  Ask groups to circle the mutual-defect payoff and then calculate what both firms would earn if they cooperated, prompting them to label the efficiency gap on their matrices.

• During the Whole Class: Repeated Game Simulation, watch for students thinking the Prisoner's Dilemma only applies to crime.

  After the simulation, display a new scenario involving two competing gyms and ask students to rebuild the matrix together, reinforcing the generalizability of the model.

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Methods used in this brief

• Simulation Game