3.8 Fiscal Policy

Fiscal policy is when the government uses spending and taxes/transfers to shift aggregate demand toward full employment. Use expansionary policy (more spending, lower taxes, more transfers) to close a recessionary gap and contractionary policy (less spending, higher taxes, fewer transfers) to close an inflationary gap.

Fiscal Policy in AP Macro

Fiscal policy in AP Macro means the government changes spending, taxes, or transfers to shift aggregate demand. Expansionary fiscal policy shifts $AD$ right to close a recessionary gap, while contractionary fiscal policy shifts $AD$ left to close an inflationary gap.

The key AP move is matching the policy to the output gap and explaining the short-run effect in the AD-AS model. Government spending affects $AD$ directly, but taxes and transfers affect $AD$ indirectly through disposable income and consumption. That is why the spending multiplier is larger than the tax multiplier.

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Why This Matters for the AP Macroeconomics Exam

Fiscal policy is a core part of how the government tries to stabilize the economy in the short run, and it shows up often because it ties together aggregate demand, the multipliers, and the AD-AS model. On multiple-choice questions you may need to pick the right policy for a given output gap or predict what happens to real GDP, the price level, and employment. On free-response questions you may need to draw AD-AS shifts, calculate how much spending or tax change is needed using the multipliers, and explain cause and effect step by step. Getting comfortable with shifts versus movements and with short-run versus long-run effects pays off across the whole exam.

Key Takeaways

• The tools of fiscal policy are government spending and taxes/transfers; spending affects aggregate demand directly, while taxes/transfers affect it indirectly through disposable income.
• Expansionary fiscal policy shifts $AD$ right to close a recessionary gap; contractionary fiscal policy shifts $AD$ left to close an inflationary gap.
• The government spending multiplier is larger than the tax multiplier, so a tax change must be bigger than a spending change to get the same effect on real GDP.
• In the short run, fiscal policy changes real output, employment, and the price level by moving the $AD$ curve along $SRAS$; $LRAS$ does not shift.
• Discretionary fiscal policy has lags because it takes time to recognize the problem, decide on the action, and put it in place.
• To find the needed change, use the multipliers and the size of the output gap.

Fiscal Policy Basics

Fiscal policy is the government's use of spending and taxes/transfers to influence aggregate demand, real output, and the price level so it can reach goals like full employment. The two tools are government spending and taxes/transfers.

How each tool works matters:

• Government spending affects aggregate demand directly. When the government buys goods and services, that spending enters the economy right away.
• Taxes and transfers affect aggregate demand indirectly. They change households' disposable income, which then changes consumption. Transfers like unemployment benefits raise disposable income and can shift $AD$ right; cutting transfers lowers disposable income and can shift $AD$ left.

There are two directions fiscal policy can go:

• Expansionary fiscal policy increases output by raising government spending, cutting taxes, or increasing transfers. Use it during a recessionary gap.
• Contractionary fiscal policy reduces inflationary pressure by cutting government spending, raising taxes, or decreasing transfers. Use it during an inflationary gap.

Discretionary Policy and Lags

Discretionary fiscal policy is when lawmakers pass a new action to change aggregate demand through spending, taxes, or transfers. It comes with lags because policymakers first have to recognize the problem, then debate and decide on a policy, and finally implement it. Those delays can weaken how well the policy works.

An application worth knowing: the stimulus checks sent to Americans during the COVID-19 downturn are an example of discretionary fiscal policy in action. This is an illustrative example, not required content.

Short-Run Effects in the AD-AS Model

Fiscal policy is mainly used to correct the economy when it is in a recessionary gap or an inflationary gap. The right choice depends on the gap between current output and potential (full-employment) output, and on the multipliers, which depend on the marginal propensity to consume (MPC) and the marginal propensity to save (MPS).

The AD-AS model shows the short-run effects. Fiscal policy shifts $AD$ along $SRAS$. The $LRAS$ curve does not shift from fiscal policy, but short-run equilibrium real output does change as the $AD$ and $SRAS$ intersection moves.

Example setup: suppose the economy is in a recessionary gap, producing 150 billion dollars of real GDP with a potential output of 200 billion dollars. The government needs to close a 50 billion dollar gap.

Expansionary Fiscal Policy

In a recession, real GDP is low and unemployment is high. The government can cut taxes, increase transfers, or increase spending. This shifts $AD$ to the right. In the short run, real GDP rises and the price level rises as the economy moves closer to full employment. $LRAS$ stays put, but the short-run equilibrium moves rightward toward $LRAS$.

Because the tax multiplier is smaller than the spending multiplier, a tax cut has to be larger than a spending increase to produce the same effect on real GDP.

Contractionary Fiscal Policy

When inflation is rising too quickly, the government can cool the economy by decreasing spending, raising taxes, or decreasing transfers. This shifts $AD$ to the left and brings the price level down. Real GDP may dip in the short run, but the trade-off can be lower inflation.

Calculating the Needed Policy Change

To move the economy back toward full employment, the government has to decide how much to change spending or taxes. The multipliers connect a policy change to the total change in real GDP.

Start with the marginal propensities:

• $MPC + MPS = 1$
• $\text{Spending multiplier} = \frac{1}{MPS}$, equivalently $\frac{1}{1-MPC}$
• $\text{Tax multiplier} = \frac{-MPC}{MPS}$

Worked example using the 50 billion dollar recessionary gap above, with $MPC = 0.5$:

• Since $MPC = 0.5$, $MPS = 0.5$.
• Spending multiplier: $1 / 0.5 = 2$. Every 1 dollar of government spending adds 2 dollars to real GDP. To close a 50 billion dollar gap, increase spending by 25 billion dollars.
• Tax multiplier: $-0.5 / 0.5 = -1$. The negative sign shows taxes and aggregate demand move in opposite directions. To raise real GDP by 50 billion dollars, cut taxes by 50 billion dollars.

This is exactly why the spending multiplier is greater than the tax multiplier. Government spending goes straight into the economy, but households might save part of a tax cut instead of spending all of it.

For an inflationary gap, apply the same math in reverse: decrease spending or increase taxes by the amount needed to shift $AD$ left and close the gap.

How to Use This on the AP Macroeconomics Exam

MCQ

• Match the policy to the gap. Recessionary gap means expansionary policy; inflationary gap means contractionary policy.
• Track all three outcomes when $AD$ shifts: real GDP, the price level, and employment.
• Remember that the spending multiplier is larger than the tax multiplier, so a given tax change moves $AD$ less than the same-sized spending change.

Free Response

• Draw AD-AS clearly. Label the axes "Price Level" and "Real GDP," not "Price" and "Quantity."
• Show the $AD$ shift along $SRAS$ and explain the direction. State that $LRAS$ does not shift from fiscal policy.
• When asked to calculate, write the multiplier formula, plug in MPC or MPS, and connect it to the size of the output gap. Show that the needed tax change is larger than the needed spending change.
• Use accurate cause and effect: a tax cut raises disposable income, which raises consumption, which shifts $AD$ right.

Common Trap

• Do not mix up shifts and movements. Fiscal policy shifts $AD$; it does not move the economy along a fixed $AD$ curve.
• Do not claim fiscal policy shifts $LRAS$. In this topic, fiscal policy works through aggregate demand in the short run.

Common Misconceptions

• Spending and tax changes are not interchangeable dollar for dollar. The spending multiplier is bigger than the tax multiplier, so equal changes do not produce equal effects on real GDP.
• The tax multiplier is negative, but a tax cut is still expansionary. The negative sign just means taxes and aggregate demand move in opposite directions. Cutting taxes raises $AD$.
• Fiscal policy does not shift $LRAS$ in this topic. It shifts $AD$ and changes short-run equilibrium output, employment, and the price level.
• Expansionary policy raises the price level. Closing a recessionary gap with more $AD$ pushes the price level up, not down.
• Lags are not the same as the policy being wrong. Discretionary fiscal policy can still be the right call; it just takes time to recognize, decide, and implement.
• Transfers are not the same as government purchases. Transfers work indirectly through disposable income and consumption, while government purchases enter aggregate demand directly.

ze of the output gap, calculate the relevant multiplier, and divide the gap by the multiplier. Use the spending multiplier for government purchases and the tax multiplier for tax changes.

Related AP Macroeconomics Guides

• 3.1 Aggregate Demand
• 3.2 Spending and Tax Multipliers
• 3.3 Short-Run Aggregate Supply (SRAS)
• 3.4 Long-Run Aggregate Supply (LRAS)
• 3.5 Equilibrium in Aggregate Demand-Aggregate Supply (AD-AS) Model
• 3.6 Changes in the AD-AS Model in the Short Run