Determinants of Supply

Active learning helps students grasp how non-price factors shift supply curves by making abstract concepts concrete. When students physically move between graphing stations or role-play as firms, they internalize why changes in costs or technology move entire curves, not just points along them. Hands-on practice reduces confusion between movements along a curve and shifts of the curve, which is a common sticking point in this topic.

• Grade 9
• Economics
• 4 activities
• 25 min–45 min

Learning Objectives

1. Analyze how changes in the cost of raw materials or labour affect a firm's supply curve.
2. Predict the impact of technological advancements on the quantity supplied for a specific product.
3. Compare the effects of government subsidies and taxes on the market supply of a good or service.
4. Explain how changes in the number of producers in a market influence the overall supply curve.

Jigsaw

⏱ 45 min·Small Groups

Graphing Stations: Supply Shifts

Prepare four stations, each with a scenario card on input costs, technology, subsidies, or taxes. Small groups draw the original supply curve, apply the change to shift it, and predict the new equilibrium price with demand. Groups rotate every 10 minutes and share one insight with the class.

Prepare & details

Analyze how changes in input costs affect a firm's supply decisions.

Facilitation Tip: During Graphing Stations, circulate with a checklist to ensure each group labels both axes and uses consistent scales before shifting curves.

Setup: Flexible seating for regrouping

Materials: Expert group reading packets, Note-taking template, Summary graphic organizer

• Understand
• Analyze
• Evaluate
• Relationship Skills
• Self-Management

Jigsaw

⏱ 35 min·Small Groups

Firm Role-Play: Determinant Cards

Distribute role cards to groups acting as firms in a market like wheat farming. Draw determinant event cards, such as 'new harvester tech' or 'fuel tax increase,' discuss impact on supply quantity, then plot shifts on a large class graph. Debrief predictions versus actual shifts.

Prepare & details

Predict the impact of new technology on the supply of a product.

Facilitation Tip: For Firm Role-Play, set a 2-minute timer per card round so students stay focused on testing how each determinant affects their supply curves.

Setup: Flexible seating for regrouping

Materials: Expert group reading packets, Note-taking template, Summary graphic organizer

• Understand
• Analyze
• Evaluate
• Relationship Skills
• Self-Management

Jigsaw

⏱ 30 min·Pairs

News Scan Pairs: Real-World Shifts

Pairs receive printed news excerpts on Canadian markets, like oil input costs or EV subsidies. Identify the determinant, sketch supply shift, and explain price effect in one paragraph. Pairs gallery walk to compare analyses.

Prepare & details

Compare how government subsidies and taxes influence market supply.

Facilitation Tip: In News Scan Pairs, provide highlighters so students can color-code articles by determinant type before sharing with the class.

Setup: Flexible seating for regrouping

Materials: Expert group reading packets, Note-taking template, Summary graphic organizer

• Understand
• Analyze
• Evaluate
• Relationship Skills
• Self-Management

Jigsaw

⏱ 25 min·Whole Class

Whole Class Prediction Game

Project scenarios one by one, such as 'number of coffee shops doubles.' Students vote on shift direction with fingers (left, right, no shift), then justify in whole-class discussion while updating a master graph.

Prepare & details

Analyze how changes in input costs affect a firm's supply decisions.

Facilitation Tip: During the Whole Class Prediction Game, cold-call students who haven’t yet participated to encourage full engagement.

Setup: Flexible seating for regrouping

Materials: Expert group reading packets, Note-taking template, Summary graphic organizer

• Understand
• Analyze
• Evaluate
• Relationship Skills
• Self-Management

Teaching This Topic

Teachers should emphasize visual and kinesthetic learning because supply shifts are spatial concepts. Start with a whole-class example (e.g., a subsidy for local farmers) to model graphing and vocabulary, then move to stations where students practice. Avoid long lectures about determinants—instead, let students discover relationships through guided examples. Research shows that students retain more when they teach their peers, so pair discussions and station rotations are key.

What to Expect

By the end of these activities, students will confidently explain how input costs, technology, producer expectations, number of firms, and government policies shift supply curves. They will also distinguish these shifts from price-induced movements along the curve and apply their understanding to real-world examples. Students should be able to sketch accurate before-and-after graphs and justify their shifts using determinant language.

Watch Out for These Misconceptions

Common Misconception

During Graphing Stations, watch for students who shift the supply curve when the price of the good changes.

What to Teach Instead

Provide a starter graph with a price change scenario and ask each group to explain why the curve stayed in place but quantity supplied moved. Circulate with a whiteboard marker to draw 'movement along' arrows versus 'shift of' arrows for struggling groups.

Common Misconception

During Firm Role-Play, watch for students who assume all taxes decrease supply more than subsidies increase it.

What to Teach Instead

Give each firm a different tax amount and subsidy level on their cards, then have them graph both before comparing results in small groups. Ask them to present which determinant had the larger impact and why, using their graphs as evidence.

Common Misconception

During News Scan Pairs, watch for students who think technology only affects high-tech products.

What to Teach Instead

Provide articles about technology in traditional industries (e.g., GPS in farming, solar panels in manufacturing) and ask pairs to identify the determinant and sketch a supply shift. During the gallery walk, ask them to find one example that surprised them and explain why.

Assessment Ideas

Quick Check

After Graphing Stations, collect each group’s supply curve diagrams for lumber furniture and check that they correctly shifted the curve leftward, labeled initial and new curves, and wrote a one-sentence explanation using the determinant 'input costs increased.'

Discussion Prompt

During Whole Class Prediction Game, listen for students to explain how improved smartphone production tech would shift supply rightward and how a heavy tax would shift it leftward. Use their reasoning to assess whether they can connect determinants to real-world outcomes.

Exit Ticket

After News Scan Pairs, collect exit tickets where students chose three factors from the list and wrote one sentence each explaining how they would shift supply for their chosen product. Look for correct direction of shift and determinant terminology (e.g., 'more firms enter the market, shifting supply right').

Extensions & Scaffolding

• Challenge students who finish early to create a supply scenario where two determinants work together (e.g., 'A drought reduces water for crops while a new irrigation tech is introduced').
• For students who struggle, provide pre-labeled graph templates with the initial curve already drawn and one determinant given.
• Deeper exploration: Have students research a real Canadian industry (e.g., maple syrup, wind energy) and present how a specific determinant has shifted its supply in the last decade.

Key Vocabulary

Input Costs	The expenses incurred by a producer for the resources used in creating a good or service, such as labour, raw materials, and energy.
Technology	The application of scientific knowledge for practical purposes, especially in industry, which can improve efficiency and reduce production costs.
Government Intervention	Actions taken by a government to influence the economy, including policies like taxes (which increase costs) and subsidies (which decrease costs).
Number of Producers	The total count of firms or individuals offering a particular good or service in a market, affecting the overall market supply.
Producer Expectations	A firm's beliefs about future market conditions, such as anticipated prices or demand, which can influence current supply decisions.