Economics & Business · Year 11

Active learning ideas

Changes in Equilibrium: Supply Shifts

Active learning works for this topic because students need to physically manipulate supply curves, observe imbalances, and witness how markets adjust. Graphing by hand and role-playing shortages create lasting mental models of equilibrium shifts that lectures alone cannot match.

• ACARA Content Descriptions
• AC9EC11K03
• AC9EC11S04

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

Activity 01

• Problem-Based Learning
• 25 min · Pairs

Pairs Graphing: Drought Scenario

Pairs sketch a demand curve on paper. Provide scenarios like a drought reducing crop supply; they shift the supply curve left, mark new equilibrium, and note price/quantity changes. Pairs then swap papers to verify each other's work.

Predict the new equilibrium price and quantity following a decrease in supply.

Facilitation Tip

During Pairs Graphing, circulate to ensure each pair labels initial equilibrium, the leftward supply shift, and the new intersection clearly with different colored pencils.

What to look for

Provide students with a scenario: 'The price of a key ingredient for making artisanal bread has doubled.' Ask them to draw a supply and demand graph showing the initial equilibrium and the new equilibrium after the supply shift. They should label the old and new equilibrium prices and quantities, and indicate the direction of the shift.

• Analyze
• Evaluate
• Create
• Decision-Making
• Self-Management
• Relationship Skills

Activity 02

• Problem-Based Learning
• 35 min · Small Groups

Small Groups: Chain of Events Cards

Give groups cards describing supply shocks and market responses. Students sequence them into a flowchart showing path to new equilibrium. Groups present to class, justifying short-term versus long-term steps.

Analyze the chain of events that leads to a new equilibrium after a supply shift.

What to look for

Present students with a statement: 'A decrease in supply always leads to a decrease in both equilibrium price and quantity.' Ask students to respond with 'True' or 'False' and provide a one-sentence justification based on their understanding of supply shifts and market adjustments.

• Analyze
• Evaluate
• Create
• Decision-Making
• Self-Management
• Relationship Skills

Activity 03

• Problem-Based Learning
• 45 min · Whole Class

Whole Class: Auction Simulation

Conduct a class auction for a good like coffee. Midway, announce a supply cut (fewer items); observe bidding changes to new equilibrium. Debrief with graphs on board.

Evaluate the short-term and long-term effects of supply changes on markets.

What to look for

Facilitate a class discussion using the prompt: 'Imagine a sudden frost damages a significant portion of Australia's avocado crop. Describe the chain of events that will occur in the avocado market, from the initial impact on supply to the eventual new equilibrium. What are the likely consequences for both consumers and producers?'

• Analyze
• Evaluate
• Create
• Decision-Making
• Self-Management
• Relationship Skills

Activity 04

• Problem-Based Learning
• 20 min · Individual

Individual: Prediction Worksheet

Students receive supply shift graphs with data tables. They predict and calculate new equilibria before checking answers. Follow with pair discussions on discrepancies.

Predict the new equilibrium price and quantity following a decrease in supply.

What to look for

Provide students with a scenario: 'The price of a key ingredient for making artisanal bread has doubled.' Ask them to draw a supply and demand graph showing the initial equilibrium and the new equilibrium after the supply shift. They should label the old and new equilibrium prices and quantities, and indicate the direction of the shift.

• Analyze
• Evaluate
• Create
• Decision-Making
• Self-Management
• Relationship Skills

A few notes on teaching this unit

Teach this topic by isolating one curve at a time—never shifting both supply and demand in the same scenario. Use real Australian examples like droughts or fuel price rises so students see immediate relevance. Avoid rushing to the new equilibrium; spend time on the adjustment process and why it takes time in real markets.

By the end of these activities, students will accurately shift supply curves, predict new equilibria, and explain why price and quantity change differently depending on elasticity. They will articulate the step-by-step process from shock to new equilibrium without confusing supply shifts with demand changes.

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Watch Out for These Misconceptions

• During Pairs Graphing, watch for students who draw both curves shifting when only supply changes.

  Prompt them to cover the demand curve and verify that only the supply curve moves; ask them to explain why the demand curve stays put given the scenario.

• During Chain of Events Cards, listen for students who assume price rises immediately and quantity stays the same.

  Have them sequence the cards step-by-step, including the short-term surplus and the gradual price adjustment, using the provided Australian examples as evidence.

• During Auction Simulation, note if students believe markets clear instantly after a supply decrease.

  Pause the auction and ask groups to debate realistic timelines, using the provided case studies to justify gradual adjustments and information lags.

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Methods used in this brief

• Problem-Based Learning