Economics & Business · Year 12

Active learning ideas

Price Elasticity of Supply (PES)

Active learning helps students grasp Price Elasticity of Supply (PES) because it moves beyond abstract formulas to show how producers actually respond to price changes. By plotting graphs, role-playing scenarios, and analyzing real cases, students connect calculations to real-world decisions that businesses make every day.

• ACARA Content Descriptions
• AC9EC12K02

• 30–50 min
• Pairs → Whole Class
• 4 activities

Activity 01

• Case Study Analysis
• 30 min · Pairs

Graphing Lab: PES Calculations

Provide data sets on crop and factory output responses to price changes. Students plot supply curves, calculate PES at points, and classify elasticity. Pairs discuss how spare capacity alters graphs.

Analyze the factors that determine a firm's ability to quickly adjust its supply.

Facilitation Tip

For the Graphing Lab, circulate with a checklist to ensure students correctly label axes, plot points accurately, and compute PES values before moving to classification.

What to look for

Present students with two scenarios: Scenario A describes a firm with significant spare factory capacity and easily transferable labor, while Scenario B describes a firm with specialized machinery and highly trained, immobile workers. Ask students to: 1. Predict which firm has more elastic supply. 2. Justify their prediction by referencing specific factors affecting PES.

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

Activity 02

• Case Study Analysis
• 45 min · Small Groups

Role-Play: Demand Shock Response

Assign roles as producers facing a sudden demand increase. Groups decide output changes based on elasticity factors, then report PES impacts on market prices. Debrief as whole class.

Evaluate the impact of PES on market adjustment to demand shocks.

Facilitation Tip

During the Role-Play, assign specific roles (e.g., factory manager, union representative) and provide time limits to keep the simulation focused on supply responses.

What to look for

Pose the question: 'Imagine the government offers a subsidy to producers of electric vehicles to encourage more production. How would the Price Elasticity of Supply for electric vehicles influence whether consumers or producers benefit more from this subsidy?' Facilitate a class discussion where students use PES concepts to explain the likely distribution of the subsidy's impact.

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

Activity 03

• Case Study Analysis
• 35 min · Small Groups

Subsidy Simulation: Incidence Game

Distribute subsidy cards to producer groups with varying PES. Simulate price and output shifts on worksheets, comparing elastic versus inelastic cases. Vote on policy effectiveness.

Explain how PES influences the incidence of a production subsidy.

Facilitation Tip

In the Subsidy Simulation, distribute pre-made graphs so students can focus on shifting curves and calculating incidence rather than drawing from scratch.

What to look for

Provide students with a simple data table showing price and quantity supplied for a product. Ask them to: 1. Calculate the PES for a specific price change. 2. State whether the supply is elastic, inelastic, or unit elastic. 3. Briefly explain one factor that might make this product's supply more or less elastic.

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

Activity 04

• Case Study Analysis
• 50 min · individual then small groups

Case Study Debate: Real Markets

Select Australian cases like mining or dairy. Individuals research PES factors, then debate in small groups how subsidies affect allocation. Present findings to class.

Analyze the factors that determine a firm's ability to quickly adjust its supply.

Facilitation Tip

In the Case Study Debate, assign each group a different real market (e.g., housing, agriculture) and require them to use PES evidence in their arguments.

What to look for

Present students with two scenarios: Scenario A describes a firm with significant spare factory capacity and easily transferable labor, while Scenario B describes a firm with specialized machinery and highly trained, immobile workers. Ask students to: 1. Predict which firm has more elastic supply. 2. Justify their prediction by referencing specific factors affecting PES.

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

A few notes on teaching this unit

Teachers should emphasize that PES is about producers’ decisions, not consumer behavior. Use side-by-side comparisons of PED and PES graphs to reinforce the difference. Research shows that students learn best when they manipulate variables in real time—plotting multiple points on the same curve helps them see why elasticity changes along a supply line. Avoid presenting PES as a fixed value; instead, frame it as a dynamic relationship that shifts with market conditions.

Students will confidently classify supply as elastic, inelastic, or unit elastic using data tables and graphs. They will explain how spare capacity, time, and factor mobility shape supply responses and apply these ideas to subsidy and market scenarios. Clear reasoning and precise calculations become routine.

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Watch Out for These Misconceptions

• PES is the same as Price Elasticity of Demand (PED).

  During Graphing Lab: PES, have students graph both supply and demand curves on the same axes using the same price and quantity changes, then calculate both elasticities side-by-side. Ask them to explain why the curves respond differently to price adjustments.

• Supply is always elastic in the long run.

  During Role-Play: Demand Shock Response, assign groups to industries with varying factor mobility (e.g., tech vs. mining) and timeframes (immediate, 6 months, 5 years). Groups present how their supply elasticity changes, highlighting that time alone does not guarantee elasticity.

• PES does not change along a supply curve.

  During Graphing Lab: PES Calculations, provide a curved supply line with multiple points. Students calculate PES at each point and observe how elasticity increases as output approaches spare capacity limits.

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Methods used in this brief

• Case Study Analysis