In AP Macroeconomics, potential output (potential real GDP) is the maximum sustainable level of output an economy produces when all resources are fully employed. It's the full-employment output level where the vertical LRAS curve sits, and the benchmark for measuring recessionary and inflationary gaps.
Potential output is the amount of real GDP an economy produces when it's running at full employment, meaning all resources (labor, capital, land, entrepreneurship) are being used at a sustainable rate. The key word is sustainable. An economy can temporarily produce more than potential output (think factories running overtime, workers pulling extra shifts), but it can't keep that up without driving wages and prices upward.
On a graph, potential output is where the long-run aggregate supply (LRAS) curve sits. The LRAS curve is vertical at the full-employment level of output because in the long run, wages and prices fully adjust, so the price level has no effect on how much the economy can actually produce. The CED also makes a connection you should memorize for the exam: the LRAS curve corresponds to the production possibilities curve (PPC) from Unit 1, because both represent maximum sustainable capacity. A point on the PPC and output at the LRAS level are the same idea drawn two different ways. For the full graphing setup, head to the Topic 3.4 study guide on LRAS.
Potential output lives in Topic 3.4 (Long-Run Aggregate Supply) in Unit 3, supporting learning objectives 3.4.A and 3.4.B. It's the anchor for almost everything in Units 3 through 5. Every AD-AS graph you draw needs the LRAS curve placed at potential output, because that's how you show whether the economy is in a recessionary gap (actual output below potential), an inflationary gap (actual output above potential), or long-run equilibrium (actual output equals potential). Without potential output as your reference line, terms like "below full employment" have no graphical meaning. It also explains why there's no long-run trade-off between inflation and unemployment. In the long run, flexible wages and prices pull the economy back to potential output no matter what happens to aggregate demand.
Keep studying AP Macroeconomics Unit 3
Long-Run Aggregate Supply (Unit 3)
LRAS and potential output are two names for the same spot on the graph. The LRAS curve is a vertical line drawn at the potential output level, so when a question says "shift LRAS right," it means potential output increased.
Production Possibilities Curve (Unit 1)
The CED says LRAS corresponds to the PPC because both show maximum sustainable capacity. Producing at potential output is the macro version of producing on (not inside) the PPC. An economy below potential output is sitting inside its PPC with unused resources.
Full Employment and the Natural Rate of Unemployment (Unit 2)
Potential output doesn't mean zero unemployment. At potential output, the economy is at the natural rate of unemployment, so frictional and structural unemployment still exist but cyclical unemployment is zero.
Economic Growth (Unit 5)
Economic growth is defined as an increase in potential output over time, shown as a rightward shift of LRAS or an outward shift of the PPC. More resources, better technology, or higher productivity all grow potential output. A short-run boom above potential is not economic growth.
Multiple-choice questions test whether you know the LRAS curve is vertical at potential output and what shifts it (changes in resources, technology, and productivity, not the price level). A classic stem starts an economy at potential output, hits it with a demand shock, and asks what happens in the short run versus the long run. The answer hinges on output returning to potential as wages adjust. On FRQs, potential output is your graphing anchor. The 2022 short answer question, for example, opened with an economy operating below full employment, which means you need to draw equilibrium output to the left of the LRAS line. Always label the full-employment output level (often written as Yf or Y*) on the horizontal axis, because graders look for it.
Actual output is what the economy is producing right now, set by where AD and SRAS intersect. Potential output is what the economy could sustainably produce at full employment, set by the LRAS curve. They're equal only in long-run equilibrium. When actual output falls short of potential, you have a recessionary gap; when actual output exceeds potential, you have an inflationary gap. Demand shocks move actual output in the short run, but only changes in resources, technology, or productivity move potential output.
Potential output is the maximum sustainable level of real GDP an economy can produce when all resources are fully employed.
The LRAS curve is vertical at potential output because in the long run, wages and prices fully adjust and the price level doesn't change real production capacity.
The LRAS curve corresponds to the PPC from Unit 1, since both represent maximum sustainable capacity.
At potential output, the unemployment rate equals the natural rate, so frictional and structural unemployment still exist but cyclical unemployment is zero.
Output gaps are measured against potential output, with a recessionary gap below it and an inflationary gap above it.
Only changes in resources, technology, or productivity shift potential output, while demand shocks just move actual output away from it temporarily.
Potential output (also called potential real GDP or full-employment output) is the maximum sustainable amount an economy can produce when all resources are fully employed. On the AD-AS graph, it's the output level where the vertical LRAS curve sits.
Yes, but only temporarily. In the short run, output can exceed potential (an inflationary gap) by overworking resources, but rising wages and prices eventually pull output back to potential. That's why there's no long-run trade-off between inflation and unemployment.
They describe the same situation from different angles. Potential output is the GDP level produced when the economy is at full employment, meaning unemployment equals its natural rate. Full employment describes the labor market; potential output describes total production.
No. At potential output, cyclical unemployment is zero, but frictional and structural unemployment still exist. The unemployment rate equals the natural rate, not zero.
Actual GDP is what the economy currently produces, determined by where AD meets SRAS. Potential output is the sustainable full-employment level shown by LRAS. The gap between them tells you whether the economy is in a recessionary gap, an inflationary gap, or long-run equilibrium.