AP Syllabus focus: ‘Expansionary and contractionary monetary policy are used to close recessionary and inflationary output gaps and restore full employment.’
Monetary policy changes economy-wide financial conditions to stabilise output and inflation. In AP Macroeconomics, the key distinction is whether the central bank is trying to stimulate spending or cool it down.
Core idea: stabilising the business cycle
Monetary policy is described by its stance:
Expansionary monetary policy when the economy is weak and unemployment is high.
Contractionary monetary policy when the economy is overheating and inflationary pressure is high.
These stances are chosen by comparing actual output to the economy’s sustainable level.
Output gap: The difference between real GDP and potential (full-employment) real GDP.
A negative output gap implies the economy is producing below potential, while a positive output gap implies production above sustainable capacity.
Recessionary vs inflationary output gaps
Recessionary output gap (negative gap)
A recessionary gap is associated with:
High cyclical unemployment
Lower inflation pressure (or disinflation)
Weak aggregate demand (AD) relative to the economy’s capacity
Recessionary output gap: A negative output gap where real GDP is below potential real GDP, typically accompanied by higher unemployment.
Inflationary output gap (positive gap)
An inflationary gap is associated with:
Very low unemployment relative to normal frictions
Rising inflation pressure
AD exceeding what the economy can sustainably produce
Inflationary output gap: A positive output gap where real GDP is above potential real GDP, typically accompanied by upward pressure on the price level.
In both cases, the objective is not to eliminate all unemployment or all inflation, but to return the economy toward sustainable output.
Expansionary monetary policy (closing a recessionary gap)
Expansionary monetary policy aims to increase overall spending by making borrowing cheaper and financial conditions easier. In AP terms, this typically shows up as lower interest rates and greater availability of credit, which encourages interest-sensitive components of AD.
Expansionary monetary policy: Central bank actions intended to increase aggregate demand by lowering interest rates and easing financial conditions to reduce a recessionary output gap.
Key macroeconomic intent (what the central bank is trying to achieve):
Boost consumer durable and housing spending that depends on financing
Raise business investment by lowering financing costs
Increase AD so that real GDP rises toward potential
Reduce cyclical unemployment as firms expand production
Policy trade-off to recognise:
If applied too aggressively or for too long, expansionary policy can create an inflationary gap and accelerate inflation.
Contractionary monetary policy (closing an inflationary gap)
Contractionary monetary policy aims to reduce overall spending by making borrowing more expensive and financial conditions tighter. In AP terms, this typically shows up as higher interest rates, discouraging interest-sensitive spending and slowing the growth of AD.
Contractionary monetary policy: Central bank actions intended to decrease aggregate demand by raising interest rates and tightening financial conditions to reduce an inflationary output gap.
Key macroeconomic intent:
Slow investment and interest-sensitive consumption
Reduce AD growth so real GDP returns toward potential
Relieve inflationary pressure and stabilise the price level
Policy trade-off to recognise:
If applied too strongly, contractionary policy can push the economy into a recessionary gap, raising unemployment.
“Restore full employment” in AP Macroeconomics
In AP Macroeconomics, full employment means the economy is producing at potential real GDP with unemployment at the natural rate (frictional + structural, but not cyclical). Monetary policy is considered appropriate when it helps move the economy back toward this level without causing unnecessary instability in inflation or output.
FAQ
To avoid abrupt tightening that could trigger a sharp rise in unemployment.
It may prioritise a smoother return to potential output over immediate disinflation.
Uncertainty about the size of the output gap can lead to smaller, gradual moves.
Large moves risk overshooting into a recessionary gap.
It implies reducing cyclical unemployment toward zero.
Frictional and structural unemployment can remain at full employment.
Expectations can be slow to adjust.
Firms and households may wait to see sustained lower inflation before changing wage/price setting.
If inflation rises due to higher costs (not excessive AD), contractionary policy can reduce inflation but at a high output/unemployment cost.
Policymakers may face a sharper trade-off between inflation and employment.
Practice Questions
(3 marks) Distinguish between expansionary and contractionary monetary policy, and state which output gap each is designed to close.
1 mark: Expansionary monetary policy increases AD (e.g., lowers interest rates/eases financial conditions).
1 mark: Used to close a recessionary (negative) output gap.
1 mark: Contractionary monetary policy decreases AD (e.g., raises interest rates/tightens financial conditions) and is used to close an inflationary (positive) output gap.
(6 marks) An economy is experiencing rising inflation and real GDP above potential. Explain how contractionary monetary policy helps restore full employment and price stability.
1 mark: Identify situation as an inflationary (positive) output gap.
1 mark: Contractionary policy raises interest rates/tightens financial conditions.
1 mark: Higher rates reduce borrowing and interest-sensitive spending (C and/or I).
1 mark: Aggregate demand falls (or grows more slowly).
1 mark: Real GDP moves back toward potential (full-employment output).
1 mark: Inflationary pressure decreases (slower rise in price level).
