Chapter 10 · Macroeconomic objectives I: Low unemployment, low and stable rate of inflation
Cyclical unemployment: monetarist/new classical
Explain cyclical unemployment after a fall in aggregate demand. Use the classical AD–AS model to show real GDP below potential output.
The economic idea
Unemployment is the condition in which people without work who are available for and actively seeking work cannot find employment. Cyclical unemployment is the unemployment caused by insufficient aggregate demand during a downturn; it disappears at full employment, unlike frictional and structural unemployment.
A recessionary or deflationary gap exists when equilibrium real GDP is below potential output. Firms respond to weak sales by reducing production, so their derived demand for labour falls and cyclical unemployment rises.
In the monetarist/new classical model, long-run equilibrium occurs where AD, SRAS and vertical LRAS meet. If output falls below LRAS, unemployment exceeds its natural rate. Falling money wages and input prices may eventually shift SRAS right until output returns to potential, assuming flexible markets and no offsetting shocks.
Demand-side policy can close the gap more quickly, but its effectiveness depends on time lags, expectations, crowding out, import leakage and whether the estimated gap is genuinely cyclical.
Reading the contraction from AD₁ to AD₂
“Price level” is on the vertical axis and “Real GDP” is on the horizontal axis.
“AD₁” is the initial aggregate-demand curve and “AD₂” is the current curve. “SRAS” shows the output firms are willing to produce at different price levels.
“LRAS” marks potential output. A horizontal distance between “Y₂” and “LRAS” is an output gap, not a direct count of unemployed people.
Starting point: E₁
“E₁” represents the initial equilibrium on “AD₁”. Its coordinates are the initial price level “Pl₁” and real GDP “Y₁”.
The demand change: AD₁ to AD₂
“AD₂” lies to the left of “AD₁”, so aggregate demand has decreased. Real GDP falls from “Y₁” to “Y₂” and the price level falls from “Pl₁” to “Pl₂”. Because current output is below full-employment output, the graph shows a recessionary gap and cyclical unemployment.
From the output gap to unemployment
When firms cannot sell their previous output, they cut production and demand fewer workers. The diagram does not plot employment directly; cyclical unemployment is inferred from real GDP lying below the model’s full-employment output.
Separate the demand shortfall from the later adjustment
Weak aggregate demand reduces firms’ sales and their demand for labour. This is cyclical unemployment, even if some structural and frictional unemployment existed before the downturn.
A classical explanation of recovery needs a further link: flexible nominal wages and other input costs can eventually shift SRAS. Do not treat that later response as an immediate consequence of drawing a lower-output equilibrium.
Demand contraction and possible self-correction
A fall in consumption, investment, government spending or net exports moves AD from “AD₁” to “AD₂”.
At the initial price level, planned expenditure is below output; inventories accumulate and firms reduce production.
The economy moves to “E₂”, changing output from “Y₁” to “Y₂” and the price level from “Pl₁” to “Pl₂”.
If wages and input prices fall, SRAS can shift right and restore output at “LRAS”; this later adjustment is not the same as the original AD contraction.
Common mistakes to avoid
- The output gap is not the unemployment rate; the diagram shows the macroeconomic cause, not a direct labour-market measurement.
- Cyclical unemployment must be distinguished from structural unemployment caused by a mismatch of skills or location.
- A movement from “Y₁” to “Y₂” does not shift productive capacity by itself.
- Do not combine the initial fall in AD and the later SRAS self-correction into one unexplained movement.
How to draw this diagram
- Title the diagram “Cyclical unemployment: monetarist/new classical”. Label the horizontal axis “Real GDP” and the vertical axis “Price level”.
- Draw AD₁ first and label it clearly.
- Draw AD₂ next and label it clearly.
- Draw SRAS next and label it clearly.
- Draw LRAS next and label it clearly.
- Mark each relevant intersection and distinguish the initial, market and socially optimum or policy outcomes where applicable.
- Project important intersections to the axes with dashed guide lines and label the outcomes.
- Check that every symbol used in the explanation appears on the diagram and add arrows showing the direction of change.
Assumptions and limitations
- The diagram infers labour-market effects from output and does not calculate the unemployment rate.
- Potential or full-employment output is estimated and can change after investment losses or hysteresis.
- The aggregate model hides different employment experiences across regions, industries and demographic groups.
- Expectations, financial conditions, exchange rates and policy responses can alter the size and duration of the downturn.