An inflationary output gap is a positive output gap that occurs when an economy's short-run equilibrium output (where AD intersects SRAS) is above the full-employment level of output, creating upward pressure on the price level (EK MOD-2.G.3).
An inflationary output gap happens when the economy is producing more than its full-employment level of output. On the AD-AS graph, the AD and SRAS curves intersect to the right of the LRAS curve. The economy is running hot. Unemployment is below its natural rate, resources are stretched thin, and all that pressure shows up as a rising price level. That's why it's called "inflationary."
Think of it like an engine redlining. The economy can run above potential for a while (workers pull overtime, factories run extra shifts), but it can't sustain it. The CED calls this a positive output gap because actual output minus potential output is a positive number. The fix is contractionary policy: the government can cut spending or raise taxes (Topic 3.8), and the central bank can raise interest rates to cool aggregate demand (Topic 4.6). Either way, the goal is to shift AD left, back to full employment, and relieve the upward pressure on prices.
This term lives at the heart of Topic 3.5 (Unit 3), where EK MOD-2.G.3 says short-run equilibrium can sit above, below, or at full employment, creating positive (inflationary) or negative (recessionary) gaps. But its real exam value is that it's the trigger for everything in Units 4 and 5. Topic 3.8 (EK POL-1.A.5) tells you contractionary fiscal policy is the response to an inflationary gap. Topic 4.6 (EK POL-1.D.1) tells you central banks use monetary policy for price stability. And Topic 5.1 ties them together, since a combination of contractionary fiscal and monetary policies can restore full employment when there's an inflationary gap. If you can't identify the gap, you can't choose the right policy, and that's exactly the chain of reasoning FRQs are built around.
Keep studying AP® Macroeconomics Unit 3
Recessionary Output Gap (Unit 3)
The mirror image. A recessionary gap means short-run output is below full employment, with high unemployment instead of high inflation. The exam loves giving you numbers (like real GDP of $8 trillion vs. potential of $9 trillion) and asking which gap it is. Output below potential means recessionary; above means inflationary.
Contractionary Fiscal Policy (Unit 3)
An inflationary gap is the textbook reason to use contractionary fiscal policy. Per EK POL-1.A.5, cutting government spending or raising taxes shifts AD left, lowering output back toward full employment and easing the price level. Note the multiplier detail too, since the spending multiplier is larger than the tax multiplier (EK POL-1.A.4).
Monetary Policy (Unit 4)
The Fed's answer to an inflationary gap is contractionary monetary policy, raising administered interest rates like interest on reserves to discourage borrowing and shift AD left (EK POL-1.D.2). One catch from EK POL-1.E.1 is that recognition and adjustment lags mean the gap might shrink on its own before the policy even kicks in.
Combined Policy Actions and Long-Run Adjustment (Unit 5)
Topic 5.1 puts it all together. A mix of contractionary fiscal and monetary policy can close an inflationary gap, affecting output, the price level, AND interest rates at once. Unit 5 also covers what happens with no policy action, since rising nominal wages eventually shift SRAS left and the economy self-corrects at a higher price level.
Multiple choice questions usually test this two ways. First, identification questions give you actual output versus potential output (in dollars or as a graph) and ask you to name the gap. The trick is direction: actual above potential is inflationary, actual below potential is recessionary. Several practice questions deliberately give you the recessionary setup (like $8 trillion actual vs. $9 trillion potential) to see if you'll mix them up. Second, policy questions ask which fiscal or monetary action closes the gap, and the answer for an inflationary gap is always contractionary (cut G, raise taxes, or raise interest rates). On FRQs, expect to draw a correctly labeled AD-AS graph showing equilibrium to the right of LRAS, then explain how a policy shifts AD left and what happens to output, the price level, and (for monetary policy) interest rates. Getting the graph labels right (AD, SRAS, LRAS, PL, real GDP, and the full-employment output level) earns points by itself.
Both are gaps between short-run equilibrium and full-employment output, but they point in opposite directions. An inflationary gap means output is ABOVE potential (positive gap, low unemployment, rising prices) and calls for contractionary policy. A recessionary gap means output is BELOW potential (negative gap, high unemployment) and calls for expansionary policy. Quick check on a graph: AD-SRAS intersection to the right of LRAS is inflationary, to the left is recessionary. Students flip these constantly, so anchor on the word itself. "Inflationary" means the economy is overheating.
An inflationary output gap exists when short-run equilibrium output is above the full-employment level, which the CED also calls a positive output gap (EK MOD-2.G.3).
On an AD-AS graph, an inflationary gap shows the AD and SRAS curves intersecting to the right of the LRAS curve.
An inflationary gap comes with unemployment below the natural rate and upward pressure on the price level.
The policy fix is contractionary: cut government spending or raise taxes (fiscal), or raise interest rates (monetary), all of which shift AD left back toward full employment.
Both fiscal and monetary policy face lags, so by the time a contractionary policy takes effect, the gap may have already changed (EK POL-1.B.1, EK POL-1.E.1).
If output is below potential instead of above it, that's a recessionary gap, and mixing up the two is one of the most common MCQ traps in Unit 3.
It's when short-run equilibrium output (where AD meets SRAS) is above the full-employment level of output shown by LRAS. The economy is producing beyond its sustainable potential, which pushes the price level up. The CED also calls it a positive output gap.
No, not in the long run. Output and employment look great in the short run, but the gap drives up the price level, and rising nominal wages will eventually shift SRAS left until the economy returns to full employment at a higher price level. That's why policymakers respond with contractionary policy.
Direction. An inflationary gap means actual output is ABOVE potential (positive gap, overheating, rising prices). A recessionary gap means actual output is BELOW potential (negative gap, high unemployment). If a question says real GDP is $8 trillion and potential is $9 trillion, that's recessionary, not inflationary.
Contractionary policy. Fiscally, the government cuts spending or raises taxes to shift AD left (EK POL-1.A.5). Monetarily, the central bank raises administered interest rates like interest on reserves to reduce borrowing and spending (Topic 4.6). Topic 5.1 covers using both together.
Draw AD and SRAS intersecting at an output level to the RIGHT of the vertical LRAS curve. Label the equilibrium output (like Y1) and the full-employment output (like Yf) on the horizontal axis, with Y1 greater than Yf. Correct labeling of all three curves and both output levels is what earns the graphing points.
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