How does an economy return to full employment on its own after a shock?
Topic 3.7 Long-Run Self-Adjustment: explain how flexible wages and prices return the economy to full-employment output after a demand or supply shock, with no policy intervention.
A focused answer to AP Macroeconomics Topic 3.7, covering how the economy self-corrects from recessionary and inflationary gaps through flexible wages shifting short-run aggregate supply, the classical view, and the trade-off with active policy, with a worked graphing question.
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What this topic is asking
Topic 3.7 explains how an economy returns to full employment on its own, with no government action. The College Board wants you to show how flexible wages shift SRAS to close a recessionary or inflationary gap, and to weigh self-adjustment against active policy. This sets up the policy debate of Unit 5.
The self-adjustment mechanism
The engine is the labor market acting on short-run aggregate supply:
- Closing a recessionary gap. When output is below potential, unemployment is above the natural rate. The slack labor market eventually pushes nominal wages down. Lower wages cut production costs, shifting SRAS right. The price level falls and output rises until the economy is back at .
- Closing an inflationary gap. When output is above potential, unemployment is below the natural rate. The tight labor market pushes nominal wages up. Higher wages raise costs, shifting SRAS left. The price level rises and output falls until the economy is back at .
The policy trade-off
This is the heart of a long-running macro debate. The classical (long-run) view holds that wages and prices are flexible enough that the economy self-corrects fairly quickly, so active policy is unnecessary and can even cause inflation. The Keynesian view stresses that wages are sticky, especially downward, so a recessionary gap can persist for a long time with painful unemployment, which justifies active fiscal or monetary policy to close the gap faster.
AP wants you to be able to show both: that the economy will self-adjust eventually, and that the cost of waiting (prolonged unemployment in a recession) is what motivates intervention.
Try this
Q1. In a recessionary gap, which way do wages move during self-adjustment, and which way does SRAS shift? [2 points]
- Cue. Wages fall; SRAS shifts right.
Q2. Give one reason a policymaker might not wait for self-adjustment. [1 point]
- Cue. Self-adjustment can be slow, leaving the economy with prolonged high unemployment in the meantime.
Exam-style practice questions
Practice questions written in the style of College Board exam questions on this dot point, with worked answer explainers. The year tag is the paper they imitate, not the source.
AP 2019 (style)1 marksMultiple choice. An economy is in a recessionary gap. With no policy intervention, the long-run self-adjustment process will (A) shift aggregate demand right. (B) shift short-run aggregate supply right as wages fall. (C) shift long-run aggregate supply left. (D) shift short-run aggregate supply left as wages rise. (E) leave the economy permanently below potential.Show worked answer →
The answer is (B). In a recessionary gap, unemployment is high, so over time nominal wages and other input prices fall. Lower production costs shift short-run aggregate supply right, lowering the price level and raising output until the economy returns to full-employment output.
(A) describes active fiscal or monetary policy, not self-adjustment. (C) is wrong direction. (D) describes the inflationary-gap case. (E) denies self-adjustment, which the long-run model assumes occurs.
AP 2022 (style)5 marksFree response. An economy is in an inflationary gap. (a) Draw a correctly labelled AD-AS graph showing the inflationary gap with AD, SRAS, and LRAS. (b) Explain what happens to nominal wages over time. (c) Show on your graph how short-run aggregate supply adjusts. (d) State the new long-run price level and output relative to the start. (e) Explain one cost of relying on self-adjustment rather than active policy.Show worked answer →
A 5-point graphing FRQ.
(a) Graph (1 point): vertical LRAS at ; AD and crossing at output and price level (inflationary gap).
(b) Wages (1 point): with unemployment below the natural rate, the tight labor market pushes nominal wages up over time.
(c) Shift (1 point): higher wages raise production costs, shifting SRAS left from to until it crosses AD on the LRAS.
(d) New long-run point (1 point): output returns to , and the price level is higher than .
(e) Cost (1 point): self-adjustment can be slow and, for a recessionary gap, means prolonged high unemployment while wages fall.
Markers reward output right of , rising wages, a leftward SRAS shift back to , and a higher final price level.
Related dot points
- Topic 3.5 Equilibrium in the AD-AS Model: locate short-run and long-run macroeconomic equilibrium, and identify recessionary and inflationary output gaps.
A focused answer to AP Macroeconomics Topic 3.5, covering short-run and long-run macroeconomic equilibrium, the relationship between short-run equilibrium and full-employment output, and how to identify recessionary and inflationary output gaps on the AD-AS graph, with a worked question.
- Topic 3.6 Changes in the AD-AS Model in the Short Run: trace how shifts in aggregate demand or short-run aggregate supply change the price level, real output, and unemployment in the short run.
A focused answer to AP Macroeconomics Topic 3.6, covering demand shocks and supply shocks in the short run, their effects on the price level, real output, and unemployment, and how to read the resulting output gaps, with a worked graphing question.
- Topic 3.3 Short-Run Aggregate Supply: explain why the short-run aggregate supply curve slopes upward using sticky wages and prices, and identify the determinants that shift it.
A focused answer to AP Macroeconomics Topic 3.3, covering the upward slope of short-run aggregate supply, sticky wages and prices and misperceptions, supply shocks, and the determinants that shift SRAS, with a worked graphing question.
- Topic 3.4 Long-Run Aggregate Supply: explain why the long-run aggregate supply curve is vertical at full-employment (potential) output, and identify what shifts it.
A focused answer to AP Macroeconomics Topic 3.4, covering the vertical long-run aggregate supply curve, full-employment and potential output, the natural rate of unemployment, the link to the production possibilities curve, and the determinants of long-run growth, with a worked question.
- Topic 3.8 Fiscal Policy: explain how expansionary and contractionary fiscal policy use government spending and taxes, with the multiplier, to close recessionary and inflationary output gaps.
A focused answer to AP Macroeconomics Topic 3.8, covering discretionary fiscal policy, expansionary and contractionary tools, using the spending and tax multipliers to size the policy needed to close an output gap, and the lags of fiscal policy, with full worked calculations.
Sources & how we know this
- AP Macroeconomics Course and Exam Description — College Board (2023)