Price Elasticity of Supply (PES)Activities & Teaching Strategies
Active learning helps students grasp Price Elasticity of Supply (PES) because this concept relies on visualising producer responses to price changes, which abstract calculations alone cannot convey. When students manipulate data, draw graphs, and role-play scenarios, they connect numerical outcomes to real-world constraints, making elastic and inelastic supply meaningful rather than abstract.
Learning Objectives
- 1Calculate the Price Elasticity of Supply (PES) for a given product or service using provided data.
- 2Analyze the impact of time horizons (short-run vs. long-run) on the elasticity of supply for specific industries.
- 3Evaluate how factors such as spare capacity, resource availability, and production complexity influence a firm's PES.
- 4Explain the relationship between a firm's PES and its ability to respond to price changes in the market.
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Data Stations: PES Calculations
Prepare four stations with industry datasets showing price and quantity changes, like coal and tourism. Groups calculate PES using the formula, plot points on supply curves, and note elasticity type. Rotate stations, then share findings in a class debrief.
Prepare & details
Explain how time influences the elasticity of a supply curve.
Facilitation Tip: During Data Stations, circulate with a checklist to ensure students annotate their percentage change calculations with clear steps, not just final answers.
Setup: Groups at tables with case materials
Materials: Case study packet (3-5 pages), Analysis framework worksheet, Presentation template
Graphing Pairs: Time Horizons
Pairs draw short-run and long-run supply curves for an industry like beef farming. Shift the price up, measure quantity responses, and label elasticities. Compare graphs with another pair to discuss time's influence.
Prepare & details
Calculate the price elasticity of supply for various industries.
Facilitation Tip: For Graphing Pairs, provide two different coloured pens to each pair so they can distinguish between short-run and long-run curves when tracing shifts.
Setup: Groups at tables with case materials
Materials: Case study packet (3-5 pages), Analysis framework worksheet, Presentation template
Market Simulation: Whole Class Role-Play
Assign students as producers in a fruit market. Announce price changes; producers signal quantity adjustments via cards. Tally class supply, calculate average PES, and graph the curve to visualize elasticity.
Prepare & details
Analyze the factors that determine the elasticity of supply.
Facilitation Tip: In the Market Simulation, assign roles with varying resource constraints—e.g., farmers with perishable goods versus miners with fixed contracts—to intensify time-sensitive decisions.
Setup: Groups at tables with case materials
Materials: Case study packet (3-5 pages), Analysis framework worksheet, Presentation template
Jigsaw: Factors Analysis
Divide factors like mobility and capacity among groups; each researches one Australian industry example. Regroup to teach peers, then rank industries by PES and justify with evidence.
Prepare & details
Explain how time influences the elasticity of a supply curve.
Facilitation Tip: During the Case Study Jigsaw, give each expert group a laminated card with a factor (e.g., storage costs, production time) to physically place on a class poster when presenting its impact on PES.
Setup: Flexible seating for regrouping
Materials: Expert group reading packets, Note-taking template, Summary graphic organizer
Teaching This Topic
Teachers often introduce PES by first contrasting it with price elasticity of demand (PED) to prevent confusion, using side-by-side graphs to highlight the positive slope of supply curves. Research shows students retain elasticity concepts better when they experience the ‘why’ behind calculations—such as why miners cannot instantly increase iron ore supply after a price jump. Avoid rushing to formulas; instead, build intuition through scenarios before formalising methods.
What to Expect
By the end of these activities, students will confidently calculate PES, interpret graphs showing time horizons, justify producer decisions in simulations, and analyse factors affecting supply elasticity. Success looks like students using precise language to explain why PES varies across contexts and timeframes, supported by evidence from their work.
These activities are a starting point. A full mission is the experience.
- Complete facilitation script with teacher dialogue
- Printable student materials, ready for class
- Differentiation strategies for every learner
Watch Out for These Misconceptions
Common MisconceptionDuring Data Stations: PES Calculations, watch for students confusing PES with PED because both use percentage changes.
What to Teach Instead
During Data Stations, have students write ‘PES only measures producer response’ at the top of their calculation sheets and circle the word ‘supply’ in every scenario to reinforce the concept before they begin.
Common MisconceptionDuring Graphing Pairs: Time Horizons, watch for students assuming supply curves always become steeper over time.
What to Teach Instead
During Graphing Pairs, ask students to label each curve with its timeframe and write a one-sentence explanation below why the long-run curve might be flatter or steeper than the short-run curve, using their own words.
Common MisconceptionDuring Market Simulation: Whole Class Role-Play, watch for students concluding that elastic PES always leads to higher revenue.
What to Teach Instead
During the simulation, provide each group with a revenue calculator sheet to complete after price changes, forcing them to link elasticity values to total revenue outcomes and debate the results in debrief.
Assessment Ideas
After Data Stations: PES Calculations, ask students to write a 3-sentence response predicting whether avocado supply is elastic or inelastic in the short run, referencing at least one constraint they encountered during the station work.
After Graphing Pairs: Time Horizons, provide students with a PES calculation (e.g., 10% price increase leads to 5% quantity increase) and ask them to classify elasticity and explain why this outcome might differ if the scenario played out over 10 years instead of 6 months.
During Market Simulation: Whole Class Role-Play, facilitate a 5-minute debrief where students compare their short-run and long-run supply decisions as bakers, using specific constraints they faced during the role-play to justify their reasoning.
Extensions & Scaffolding
- Challenge: Ask students to design a product with perfectly elastic supply and another with perfectly inelastic supply, then justify their choices with real-world examples.
- Scaffolding: Provide a partially completed PES calculation table with missing percentage change steps for students to fill in before attempting full calculations.
- Deeper: Invite students to research a recent Australian case where supply constraints affected PES, such as the 2020 timber shortage, and present how time and factor mobility influenced outcomes.
Key Vocabulary
| Price Elasticity of Supply (PES) | A measure of how much the quantity supplied of a good or service responds to a change in its price. It is calculated as the percentage change in quantity supplied divided by the percentage change in price. |
| Elastic Supply | Occurs when the PES is greater than 1, meaning that the percentage change in quantity supplied is larger than the percentage change in price. Producers can easily increase output. |
| Inelastic Supply | Occurs when the PES is less than 1, meaning that the percentage change in quantity supplied is smaller than the percentage change in price. Producers find it difficult to increase output quickly. |
| Unit Elastic Supply | Occurs when the PES is exactly equal to 1, meaning that the percentage change in quantity supplied is equal to the percentage change in price. |
| Short-run Supply | A period where at least one factor of production is fixed, limiting the ability of producers to change output in response to price signals. |
| Long-run Supply | A period where all factors of production are variable, allowing producers to adjust their output levels more freely in response to price changes. |
Suggested Methodologies
More in The Price Mechanism
The Law of Demand
Examining the relationship between price and quantity demanded from a consumer perspective.
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Factors Affecting Demand (Shifts)
Investigating non-price determinants that cause the entire demand curve to shift.
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The Law of Supply
Examining the relationship between price and quantity supplied from a producer perspective.
2 methodologies
Factors Affecting Supply (Shifts)
Investigating non-price determinants that cause the entire supply curve to shift.
2 methodologies
Market Equilibrium: Price and Quantity
Identifying the point where supply meets demand and the consequences of surpluses and shortages.
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