Economics · Grade 9

Active learning ideas

Demand: Definition and Law

Active learning works for this topic because the Law of Demand describes real-world behavior that students experience daily. When students physically participate in simulations or discussions, they connect abstract economic rules to their own decision-making, making the concept stick better than through lecture alone.

• Ontario Curriculum Expectations
• CEE.Std3.1

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

Activity 01

• Simulation Game
• 30 min · Whole Class

Simulation Game: The Classroom Auction

Auction off a desirable item (like a snack or a 'no-homework' pass) starting at a very high price and lowering it gradually. Students record how many people are willing to 'buy' at each price point, then use that data to plot a real demand curve on the board.

Explain the Law of Demand and its real-world implications.

Facilitation Tip

During The Classroom Auction, set clear starting bids and bidding increments so students focus on the relationship between price and quantity demanded rather than winning the item.

What to look for

Present students with scenarios. For each, ask: 'Is this a change in quantity demanded or a change in demand? Explain your reasoning.' For example: 'The price of concert tickets dropped by $20.' or 'A new study shows that eating blueberries improves memory.'

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

Activity 02

• Think-Pair-Share
• 20 min · Pairs

Think-Pair-Share: Substitutes and Complements

Give students a list of Canadian products (e.g., Tim Hortons coffee, winter tires, maple syrup). In pairs, they identify one substitute and one complement for each and explain how a price hike in the original product would affect demand for the others.

Analyze how a change in price affects consumer purchasing power.

Facilitation Tip

For Substitutes and Complements, provide real-world examples like coffee and creamer or smartphones and phone cases to ground the discussion in familiar contexts.

What to look for

On one side of an index card, students write the Law of Demand in their own words. On the other side, they list two factors that could cause the demand for their favorite snack to increase, and explain how each factor affects demand.

• Understand
• Apply
• Analyze
• Self-Awareness
• Relationship Skills

Activity 03

• Inquiry Circle
• 45 min · Small Groups

Inquiry Circle: The 'Trend' Tracker

Groups choose a recent viral trend (like a specific sneaker or a TikTok-famous snack). They investigate what caused the demand shift (celebrity endorsement, social media, etc.) and present a 'Demand Shift' poster showing the original and new demand curves.

Differentiate between a change in quantity demanded and a change in demand.

Facilitation Tip

When running The 'Trend' Tracker, give students a two-week window to collect data so trends are visible but not overwhelming to analyze.

What to look for

Pose the question: 'Imagine the price of streaming services suddenly doubled. How would this affect your personal 'purchasing power' for entertainment? Discuss with a partner how this is different from a situation where a new, popular streaming service becomes available.'

• Analyze
• Evaluate
• Create
• Self-Management
• Self-Awareness

A few notes on teaching this unit

Teachers approach this topic by grounding abstract concepts in concrete experiences. Avoid starting with formal definitions; instead, let students observe patterns first through activities like auctions or trend tracking. Research suggests that when students generate examples themselves, their understanding of demand becomes more flexible and applicable to new situations. Emphasize the difference between 'wanting' and 'demanding' early to prevent common misconceptions.

Successful learning looks like students confidently distinguishing between price effects and non-price determinants of demand. They should use evidence from activities to explain why demand curves shift or move along the curve, and apply these ideas to everyday situations like sales or pricing changes.

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Watch Out for These Misconceptions

• During The Classroom Auction, watch for students who confuse a bid increase with a shift in demand rather than a movement along the demand curve.

  After the auction, have students draw the original and new quantity demanded points on a large floor-grid with string. Ask them to explain why the curve did not shift, only the point moved.

• During Substitutes and Complements, listen for students who say 'I want it, so demand goes up' without considering ability to pay.

  Use the luxury car versus used car example during the discussion. Ask students to consider income levels and write a sentence explaining why one group demonstrates demand while the other does not.

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Methods used in this brief

• Simulation Game
• Think-Pair-Share
• Inquiry Circle