Aggregate Demand, Aggregate Supply, and Equilibrium
This topic tests AD, SRAS, LRAS, output gaps, price level, real GDP, shocks, equilibrium, recessionary gaps, inflationary gaps, and self-correction.
How to study for AP Macroeconomics
Build every answer from the model first: define the indicator, draw the correct graph, shift the correct curve, predict outcomes, and explain the economic mechanism.
Core concepts
Concept 1
AD-AS questions require naming the curve and direction of the shift.
Exam cue: Identify whether the shock affects spending, resources, costs, productivity, or expectations.
Concept 2
Short-run and long-run outcomes can differ.
Exam cue: Shift one curve and read output and price-level changes.
Concept 3
Output gaps connect real GDP, unemployment, and price-level pressure.
Exam cue: Compare actual output to potential output.
Risk pitfalls and guardrails
Shifting AD when the shock changes production costs.
Guardrail: Avoid answers that rely only on habit, ignore the stated source, skip safety or compliance steps, or choose convenience over the professional standard.
Ignoring LRAS when asked about long-run adjustment.
Guardrail: Avoid answers that rely only on habit, ignore the stated source, skip safety or compliance steps, or choose convenience over the professional standard.
Mixing up inflationary and recessionary gaps.
Guardrail: Avoid answers that rely only on habit, ignore the stated source, skip safety or compliance steps, or choose convenience over the professional standard.
Memory anchors
Aggregate Demand
Aggregate demand shows total planned spending at each price level.
SRAS
Short-run aggregate supply shows output firms produce at each price level with sticky inputs.
LRAS
Long-run aggregate supply shows potential output when resources are fully employed.
Equilibrium Output
Equilibrium output occurs where aggregate demand and aggregate supply intersect.
Price Level
Price level measures overall prices in the economy.
Recessionary Gap
A recessionary gap occurs when actual output is below potential output.
Inflationary Gap
An inflationary gap occurs when actual output is above potential output.
Supply Shock
A supply shock shifts short-run aggregate supply.
Demand Shock
A demand shock shifts aggregate demand and changes output and price level in the short run.
Checkpoint rule
Do the check-up only after you can summarize each concept in one sentence and identify one dangerous pitfall from memory.
Knowledge Check (after reading)
Short check-up to confirm understanding of this module.
Check-up Questions
The aggregate demand (AD) curve shows the relationship between the price level and which of the following?
The aggregate demand curve slopes downward in part because of the 'wealth effect,' which holds that a lower price level does which of the following?
Answer all questions to submit.
Next step personalized recommendations
Continue learning
Move forward only after this module is stable.
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