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AP® Macroeconomics · Unit 3 · Topic 3.4

Long-Run Aggregate Supply (LRAS): Topic Checklist (Macroeconomics 3.4)

Specific “I can…” statements for long-run aggregate supply, each linked to the guide section and practice question that shows whether you can really do it.

Work through the list without notes. If you cannot do a statement, follow its link, then come back. Guide = study guide; Practice = practice questions.

Understanding

  • I can define the short run and the long run by whether wages and other input prices can fully adjust. (Guide: “The short run and the long run”; Practice Q2)
  • I can define the LRAS curve and full-employment output (Yf). (Guide: “Why the LRAS curve is vertical”)
  • I can explain why unemployment equals the natural rate, not zero, at Yf. (Guide: “Why the LRAS curve is vertical”, paragraph “What full employment means”; Practice Q3)
  • I can explain why the LRAS curve and the PPC both show maximum sustainable capacity. (Guide: “The LRAS curve and the PPC”; Practice Q4)

Skills

  • I can draw a vertical LRAS curve at Yf with the axes labelled price level and real GDP. (Guide: Figure 1; Practice Q6(a))
  • I can identify full-employment output from unemployment data and the natural rate, and calculate cyclical unemployment. (Guide: Worked example 2; Practice Q5)
  • I can calculate profit per unit in the short run and the long run when the price level changes. (Guide: Worked example 1; Practice Q7(a)–(b))

Reasoning

  • I can explain why full adjustment of wages and prices makes LRAS vertical, and why sticky wages make SRAS slope upward. (Guide: Worked example 1(d); Practice Q1, Q7(c))
  • I can explain why there is no long-run trade-off between inflation and unemployment. (Guide: “No long-run trade-off”; Practice Q6(c))
  • I can match points inside, on and beyond the sustainable capacity of the PPC to output below, at and above Yf. (Guide: Worked example 2; Practice Q4, Q5(d))
  • I can tell an event that shifts only SRAS from one that also shifts LRAS. (Guide: “The LRAS curve and the PPC”, paragraph “What moves LRAS”; Practice Q7(d))

All ticked? Move on to the equilibrium in the AD–AS model study guide, or return to the course roadmap.

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