Aggregate Supply (AS): Short-Run and Long-Run

Active learning works for this topic because the shape and movement of aggregate supply curves depend on human behaviors like wage negotiations and contract renewals. When students physically build, role-play, and storyboard these concepts, they connect abstract economic theories to real-world decisions and delays that stick in their memory.

• 12th Grade
• Economics
• 3 activities
• 30 min–40 min

Learning Objectives

1. Compare the graphical representations of the short-run aggregate supply (SRAS) and long-run aggregate supply (LRAS) curves, identifying key differences in their slopes and implications.
2. Explain how changes in input prices, productivity, and expectations shift the SRAS curve, providing specific examples for each determinant.
3. Analyze the determinants of potential GDP, including labor, capital, technology, and institutions, and their impact on the LRAS curve.
4. Evaluate the economic consequences of an economy operating above or below its potential GDP, referencing shifts in the SRAS and LRAS.

Flipped Classroom

⏱ 35 min·Individual

Diagram Construction: Building SRAS and LRAS from Scratch

Students receive blank axes and a set of scenario cards describing how different shocks affect producer behavior. They draw both curves, apply each shock, and narrate whether it shifts SRAS, LRAS, or both. Students trade papers with a classmate for peer critique before the class reviews the most commonly contested shifts.

Prepare & details

Differentiate between the short-run and long-run aggregate supply curves.

Facilitation Tip: During Diagram Construction, insist students annotate each curve with at least one sticky-cost example to anchor their understanding in concrete costs like union contracts or minimum wage laws.

Setup: Standard classroom, flexible for group activities during class

Materials: Pre-class content (video/reading with guiding questions), Readiness check or entrance ticket, In-class application activity, Reflection journal

• Understand
• Apply
• Analyze
• Self-Management
• Self-Awareness

Role Play

⏱ 30 min·Pairs

Role Play: Why Are Wages Sticky?

Assign student pairs one of four theories explaining wage stickiness: long-term labor contracts, efficiency wages, the cost of wage cuts for worker morale, and menu costs. Each pair presents their explanation to the class in two minutes, and the class votes on which theory best explains wage rigidity in the US context. Discussion then focuses on how the stickiness theory shapes predictions about how quickly the economy self-corrects.

Prepare & details

Explain the factors that cause the short-run aggregate supply curve to shift.

Setup: Open space or rearranged desks for scenario staging

Materials: Character cards with backstory and goals, Scenario briefing sheet

• Apply
• Analyze
• Evaluate
• Social Awareness
• Self-Awareness

Flipped Classroom

⏱ 40 min·Small Groups

Storyboard: The Self-Correction Process

Groups create a four-panel storyboard showing what happens after a negative demand shock moves the economy below potential GDP: the short-run recessionary gap position, the adjustment mechanism of falling wages and input costs, the rightward shift in SRAS, and the return to long-run equilibrium. Groups present and the class compares the adjustment timeline across different scenarios.

Prepare & details

Analyze the concept of full employment output (potential GDP) in the long run.

Setup: Standard classroom, flexible for group activities during class

Materials: Pre-class content (video/reading with guiding questions), Readiness check or entrance ticket, In-class application activity, Reflection journal

• Understand
• Apply
• Analyze
• Self-Management
• Self-Awareness

Teaching This Topic

Experienced teachers approach this topic by starting with the human stories behind the curves—why a baker keeps prices high even when demand falls, or why a software firm hesitates to hire during uncertainty. Avoid rushing straight to memorizing shifts; instead, build the curves from real decisions so students internalize the mechanisms. Research shows that drawing and labeling the curves by hand improves spatial memory and retention far more than mere observation.

What to Expect

By the end of these activities, students should be able to draw accurate SRAS and LRAS curves, explain why the SRAS slopes upward and the LRAS is vertical, and trace how an economy moves between short-run disequilibrium and long-run potential GDP. Successful learning includes clear labels, reasoned shifts, and explicit references to sticky wages and resource constraints.

Watch Out for These Misconceptions

Common Misconception

During Diagram Construction, watch for students who shift both SRAS and LRAS by the same factors.

What to Teach Instead

Pause the group and ask each pair to sort a set of change cards into two columns: 'Moves SRAS only' and 'Moves both SRAS and LRAS.' This tactile sorting forces them to confront and correct the misconception using their labeled curves.

Common Misconception

During Storyboard: The Self-Correction Process, watch for students who assume adjustment happens within months.

What to Teach Instead

Have students add calendar markers and human faces to their storyboard frames, writing approximate time lags (e.g., '18 months for wage renegotiation') and noting unemployment levels to make the delay visible and real.

Assessment Ideas

Quick Check

After Diagram Construction, present students with a scenario such as a new minimum wage law and ask them to redraw SRAS and LRAS with labeled shifts, then explain the reasoning under the curves using their original diagrams as evidence.

Discussion Prompt

During Storyboard: The Self-Correction Process, ask groups to present their storyboards and hold a gallery walk where peers identify the slowest and fastest steps in the adjustment process and connect them to classical or Keynesian views.

Exit Ticket

After Role Play: Why Are Wages Sticky?, students write a one-paragraph reflection on which role (worker, firm, union) they found hardest to defend and why, linking their experience to the slope of the SRAS curve.

Extensions & Scaffolding

• Challenge early finishers to predict how a sudden rise in immigration would shift both SRAS and LRAS, and to illustrate the short-run adjustment path on a graph.
• Scaffolding for struggling students: Provide labeled graph templates with key words missing (e.g., 'sticky wages,' 'potential GDP') and have them fill in the blanks during Diagram Construction.
• Deeper exploration: Ask students to research a historical period of stagflation (e.g., 1970s oil shocks) and use their storyboard template to map how rising input costs moved SRAS leftward and how long-run adjustments eventually restored potential GDP.

Key Vocabulary

Aggregate Supply (AS)	The total amount of goods and services that firms in an economy plan to sell at different price levels.
Short-Run Aggregate Supply (SRAS)	The relationship between the price level and the quantity of output supplied when some input prices, like wages, are fixed or sticky.
Long-Run Aggregate Supply (LRAS)	The relationship between the price level and the quantity of output supplied when all prices, including input prices, are fully flexible.
Potential GDP	The maximum sustainable output an economy can produce when all resources are fully employed without generating accelerating inflation.