In AP Macro, short-run equilibrium is the point where the aggregate demand (AD) curve intersects the short-run aggregate supply (SRAS) curve, determining the economy's current real GDP and price level. Because wages are sticky in the short run, this output can sit above or below full employment.
Short-run equilibrium is where the economy actually IS right now. Graphically, it's the intersection of the aggregate demand (AD) curve and the short-run aggregate supply (SRAS) curve. That intersection pins down two numbers at once, the current price level and current real GDP.
Here's the catch that makes it "short-run." Wages and many prices are sticky, meaning they don't adjust instantly when conditions change. So the AD-SRAS intersection can land to the left of full-employment output (a recessionary gap) or to the right of it (an inflationary gap). The economy is balanced in the sense that buyers and sellers agree at that price level, but it's not necessarily healthy. Think of short-run equilibrium as a snapshot, while long-run equilibrium is where the economy settles once wages finally catch up.
Short-run equilibrium lives in Unit 3 (National Income and Price Determination) and is the starting point for Topic 3.7, Long-Run Self-Adjustment. Learning objective 3.7.A asks you to explain, with graphs, how output, employment, and the price level respond to an AD or AS shock in the long run. You literally cannot do that without first locating the short-run equilibrium the shock creates. Per EK MOD-2.I.1, flexible wages and prices eventually shift SRAS to restore full employment, so every long-run adjustment story begins at a short-run equilibrium that's sitting in a gap. This is also the single most-drawn graph in AP Macro. The AD-AS diagram with a short-run equilibrium point shows up across fiscal policy, monetary policy, and Phillips curve questions.
Keep studying AP Macroeconomics Unit 3
Long-Run Equilibrium (Unit 3)
Long-run equilibrium is short-run equilibrium plus one extra condition. AD, SRAS, and LRAS all intersect at the same point, so output equals full-employment output. If the economy is in short-run equilibrium with a gap, flexible wages eventually move SRAS until the economy lands back on LRAS.
Inflationary Gap (Unit 3)
When short-run equilibrium output is above full employment, you have an inflationary gap. The 2023 FRQ used exactly this setup, with actual inflation running above expected inflation. Wages rise to catch up, SRAS shifts left, and the gap closes on its own.
Fiscal and Monetary Policy (Units 3-4)
Policy questions are really questions about moving the short-run equilibrium on purpose. Expansionary fiscal or monetary policy shifts AD right to push a recessionary short-run equilibrium toward full employment, instead of waiting for slow wage adjustment to do it.
The Phillips Curve (Unit 5)
Every short-run equilibrium on the AD-AS graph maps to a point on the short-run Phillips curve. An inflationary gap means higher inflation and unemployment below the natural rate; a recessionary gap means the opposite. Released SAQs (2017, 2019) hand you unemployment and inflation numbers and expect you to identify which gap the short-run equilibrium is in.
Short-run equilibrium is mostly tested through graphing and gap identification. The 2023 FRQ opened with "the economy of Noralandia is in short-run equilibrium" and asked for a correctly labeled AD-AS graph, so you need to draw AD, SRAS, and LRAS, mark the equilibrium price level and output, and show whether output is above or below full employment. SAQs from 2017 and 2019 give you unemployment rates (like actual 7% vs. natural 5%) and expect you to infer the economy is in a recessionary gap, which is just a short-run equilibrium left of LRAS. MCQs love the "in the absence of policy intervention" stem. A positive AD shock raises output and the price level in the short run, but in the long run output returns to full employment while the price level stays higher. Know the short-run result and the long-run destination, and be able to explain the wage-adjustment mechanism connecting them.
Short-run equilibrium only requires AD to intersect SRAS, so output can be anywhere, in a recessionary gap, an inflationary gap, or at full employment. Long-run equilibrium requires AD, SRAS, and LRAS to all intersect at one point, so output must equal full-employment output. The short run allows gaps because wages are sticky; the long run eliminates gaps because wages are flexible. Quick test: if the question mentions output above or below potential, you're at a short-run equilibrium that is not a long-run one.
Short-run equilibrium is the intersection of AD and SRAS, which determines the economy's current real GDP and price level.
Because wages and prices are sticky in the short run, short-run equilibrium output can be below full employment (recessionary gap) or above it (inflationary gap).
An economy can be in short-run equilibrium without being in long-run equilibrium; long-run equilibrium adds the requirement that output equals full-employment output on LRAS.
Without policy action, flexible wages and prices shift SRAS over time to close any gap, returning output to full employment (EK MOD-2.I.1).
After a positive AD shock, the short-run equilibrium has higher output and a higher price level, but the long-run equilibrium has the original full-employment output at an even higher price level.
On FRQs, always mark the short-run equilibrium where AD crosses SRAS and label the equilibrium price level and output on the axes, plus LRAS to show the gap.
It's the point where the aggregate demand curve intersects the short-run aggregate supply curve, determining the economy's current price level and real GDP. Because wages are sticky, this output doesn't have to equal full-employment output.
No. Short-run equilibrium just means AD and SRAS intersect; the economy could be in a recessionary gap, an inflationary gap, or coincidentally at full employment. Full employment only has to hold in long-run equilibrium.
Short-run equilibrium needs only AD = SRAS, while long-run equilibrium needs AD, SRAS, and LRAS to intersect at the same point. In the long run, flexible wages shift SRAS until output returns to full employment, which is the whole point of Topic 3.7.
Yes, in the AP model it does, just slowly. High unemployment eventually pushes wages down, which shifts SRAS right until short-run equilibrium output returns to full employment and unemployment hits its natural rate. That self-adjustment is exactly what EK MOD-2.I.1 describes.
Draw downward-sloping AD, upward-sloping SRAS, and vertical LRAS, then mark the equilibrium where AD crosses SRAS and label its price level and output on the axes. The 2023 FRQ asked for exactly this, with equilibrium output to the right of LRAS to show an inflationary gap.
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