AD-AS Model: Equilibrium and Shocks

Active learning works for this topic because students need to see dynamic changes in graph shapes to grasp how economic shocks shift curves. When learners physically move between stations or role-play scenarios, the abstract concept of equilibrium becomes concrete and memorable.

• Year 11
• Economics & Business
• 4 activities
• 30 min–50 min

Learning Objectives

1. Analyze the short-run and long-run effects of a negative demand shock on equilibrium output and the price level using the AD-AS model.
2. Evaluate the impact of an adverse supply shock on equilibrium output, the price level, and unemployment in the short run.
3. Explain the mechanisms through which an economy self-corrects to its long-run equilibrium following a shock.
4. Compare the outcomes of demand shocks versus supply shocks on key macroeconomic indicators.

Simulation Game

⏱ 45 min·Small Groups

Graphing Stations: Shock Scenarios

Prepare four stations, each with a scenario card (e.g., recession, oil shock). Groups draw initial AD-AS equilibrium, then shift curves for the shock and label new output/price changes. Rotate every 10 minutes, comparing predictions.

Prepare & details

Predict the impact of a negative demand shock on equilibrium output and price level.

Facilitation Tip: At Graphing Stations, have students first label the initial equilibrium on blank graph templates before applying any shock, ensuring they anchor their starting point.

Setup: Flexible space for group stations

Materials: Role cards with goals/resources, Game currency or tokens, Round tracker

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

Simulation Game

⏱ 50 min·Whole Class

Simulation Cards: Demand and Supply Shocks

Distribute economy role cards (consumers, firms, government). Teacher introduces shocks via announcements; students adjust 'output tokens' and record price/output shifts on worksheets. Debrief with class graph on board.

Prepare & details

Analyze how supply shocks affect the AD-AS equilibrium.

Facilitation Tip: When using Simulation Cards, circulate and prompt groups with questions like, 'What happens to firms’ costs if wages rise?' to keep the focus on economic reasoning.

Setup: Flexible space for group stations

Materials: Role cards with goals/resources, Game currency or tokens, Round tracker

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

Simulation Game

⏱ 30 min·Pairs

Pair Graph Challenges: Equilibrium Matching

Pairs receive jumbled AD-AS graphs and shock descriptions. They match graphs to shocks, explain shifts, and predict policy responses. Switch pairs to verify and discuss discrepancies.

Prepare & details

Evaluate the self-correcting mechanisms of the economy in the long run.

Facilitation Tip: For Pair Graph Challenges, require students to verbally justify each curve shift to their partner before drawing, reinforcing peer accountability.

Setup: Flexible space for group stations

Materials: Role cards with goals/resources, Game currency or tokens, Round tracker

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

Simulation Game

⏱ 35 min·Individual

Data Dive: Real Australian Shocks

Provide ABS data on GDP/inflation events (e.g., 2020 bushfires). Individuals plot AD-AS shifts, then share in small groups to debate long-run adjustments.

Prepare & details

Predict the impact of a negative demand shock on equilibrium output and price level.

Facilitation Tip: In the Data Dive, provide raw data tables and ask students to calculate percentage changes before graphing, building quantitative literacy.

Setup: Flexible space for group stations

Materials: Role cards with goals/resources, Game currency or tokens, Round tracker

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

Teaching This Topic

Experienced teachers approach this topic by emphasizing the difference between short-run movements and long-run anchors. Use analogies like a see-saw to show temporary imbalances versus the fixed fulcrum of potential output. Avoid overcomplicating with real-world noise; focus first on clean graphing mechanics. Research suggests students grasp shifts better when they create multiple versions of the same graph rather than one static image.

What to Expect

Successful learning looks like students accurately drawing shifted curves, labeling equilibrium points, and explaining short-run versus long-run effects with evidence. They should confidently predict output and price changes in response to shocks and articulate the self-correcting mechanism.

Watch Out for These Misconceptions

Common Misconception

During Graphing Stations, watch for students who move the LRAS curve when a demand shock occurs.

What to Teach Instead

Remind students to keep LRAS fixed and focus only on AD and SRAS shifts. Point to the station instructions that highlight LRAS as vertical at potential output and ask them to trace it with their finger before starting.

Common Misconception

During Simulation Cards, watch for students who assume supply shocks always lower prices.

What to Teach Instead

Have students refer to their role cards that specify the type of shock. Ask them to sketch a quick graph on scrap paper showing the direction of SRAS and the resulting price change before continuing the simulation.

Common Misconception

During the Data Dive, watch for students who confuse short-run effects with long-run self-correction.

What to Teach Instead

Ask students to create two separate graphs for each shock: one for the initial impact and another for the long-run adjustment. Circulate and check that they label the mechanisms (e.g., wage adjustments) on the second graph.

Assessment Ideas

Quick Check

After Graphing Stations, collect students’ completed graph templates and quickly scan for correct labeling of initial equilibrium, shifts, and new equilibrium points. Provide immediate feedback on any mislabeled curves or omitted labels.

Discussion Prompt

During Simulation Cards, pause the activity after each round and ask groups to share their predictions for output and price level changes. Listen for accurate use of AD-AS terminology and challenge any misconceptions on the spot.

Exit Ticket

After the Data Dive, have students submit their graphing worksheets and written responses to the exit questions. Review their ability to define 'economic shock' and accurately predict changes in output and price level based on the shock type.

Extensions & Scaffolding

• Challenge early finishers to design a positive supply shock scenario and predict its effects on inflation and unemployment.
• Scaffolding for struggling students: Provide partially completed graphs with key points labeled, such as the initial equilibrium and LRAS line.
• Deeper exploration: Ask students to research a historical shock (e.g., 1970s oil crisis) and compare their AD-AS predictions to actual outcomes using secondary sources.

Key Vocabulary

Aggregate Demand (AD)	The total demand for goods and services in an economy at a given overall price level and a given time period. It is represented by a downward-sloping curve.
Short-Run Aggregate Supply (SRAS)	The total supply of goods and services that firms in a national economy plan on selling during a specific time period. It is represented by an upward-sloping curve.
Long-Run Aggregate Supply (LRAS)	The total production of goods and services possible in an economy when all resources are fully employed. It is represented by a vertical line at potential output.
Equilibrium Output	The level of real GDP where aggregate demand equals aggregate supply, representing the current state of the economy.
Economic Shock	An unexpected event that affects an economy, either positively or negatively, causing significant changes in aggregate demand or aggregate supply.