An inflationary gap occurs when the economy is producing above its long-run potential. Contractionary fiscal and monetary policy, used together, reduce aggregate demand to bring real output back to full employment and ease upward pressure on prices.

Inflationary gap and the stabilization objective

In an inflationary gap, the economy’s short-run equilibrium is at a level of output where unemployment is below the natural rate and firms face rising input costs and stronger demand. The policy goal is to reduce aggregate demand (AD) so equilibrium real GDP returns to potential without creating an unnecessarily deep downturn.

A positive output gap ($Y>Y^*$) signals an inflationary gap and motivates contractionary demand-side policy.

AD–AS model showing contractionary monetary policy shifting aggregate demand left (from $AD_0$ to $AD_1$) to move equilibrium output back to potential output (the vertical $LRAS$ line). The diagram also highlights the accompanying reduction in the price level relative to the initial inflationary equilibrium, matching the stabilization goal in an inflationary gap. Source

Contractionary fiscal policy (tight fiscal stance)

Fiscal policy is set by Congress and the President through changes in government spending and taxes. To reduce AD in an inflationary gap, contractionary fiscal actions include:

• Decreasing government purchases (G), which directly lowers AD.

• Increasing taxes (T), which reduces disposable income, lowering consumption (C).

• Reducing transfer payments, which also lowers disposable income and consumption.

Because fiscal policy works through spending decisions and household/business after-tax income, its impact depends on how strongly consumption responds and how quickly legislation is implemented.

How fiscal tightening shifts AD

• Lower G reduces planned spending immediately.

• Higher T reduces household purchasing power, lowering C.

• Lower consumption and planned spending shift AD left.

Two-panel AD–AS figure where panel (b) illustrates contractionary fiscal policy shifting $AD$ left to close an inflationary gap (bringing output from $Y_1$ back to potential $Y_P$). It emphasizes that the policy changes the position of the $AD$ curve (a shift), not a movement along $AD$, while lowering the price level relative to the initial outcome. Source

Contractionary monetary policy (tight money)

Monetary policy is conducted by the central bank to influence the money supply and interest rates. In an inflationary gap, contractionary monetary policy aims to reduce interest-sensitive spending by:

• Open market sales of government securities, which reduce bank reserves and the money supply.

• Raising the discount rate, discouraging bank borrowing from the central bank.

• Raising reserve requirements, reducing banks’ ability to create loans (used rarely in practice).

As the money supply contracts, interest rates tend to rise, which reduces:

• Investment (I) (firms face higher borrowing costs).

• Consumption of durable goods and housing (more expensive credit).

This decrease in interest-sensitive spending shifts AD left.

Using combined contractionary policies to close the inflationary gap

Combined contractionary fiscal and monetary policy is used when policymakers want a more reliable or faster reduction in AD than either policy alone, consistent with the syllabus focus: both policies reduce AD to return output to full employment during an inflationary gap.

AD–AS logic (short run)

• Start: Economy at short-run equilibrium where real GDP is above potential ($Y>Y^*$) and the price level is rising.

• Policy: Contractionary fiscal policy (↓G and/or ↑T) shifts AD left.

• Policy: Contractionary monetary policy (↓money supply) also shifts AD left via higher interest rates and lower I (and some C).

• Result: New short-run equilibrium closer to (or at) potential output $Y^*$ with a lower price level than otherwise (lower inflationary pressure).

Interest-rate considerations when both policies are used

• Contractionary monetary policy pushes interest rates up.

• Contractionary fiscal policy can put downward pressure on interest rates by reducing total spending needs in the economy.

• When combined, the net interest-rate outcome depends on the relative strength of each policy, but the intended shared outcome is a leftward shift of AD to eliminate the inflationary gap.

Common pitfalls for graphs and explanations

• Don’t confuse a left shift of AD (policy change) with a movement along AD (caused by a price-level change).

• Closing an inflationary gap means real output falls toward $Y^*$; it does not mean the economy is “shrinking forever.”

• Overly aggressive tightening can overshoot, creating a recessionary gap, so coordination is often about choosing the right magnitude and timing.