Chapter 16: Fiscal Policy – Macroeconomics Study Notes

Fiscal Policy

What Is Fiscal Policy?

Fiscal policy refers to the use of government spending, transfer payments, and taxation to influence macroeconomic outcomes such as real GDP, unemployment, and inflation. It is primarily conducted at the federal level and can be either automatic or discretionary.

• Automatic stabilizers: Government spending and taxes that automatically increase or decrease with the business cycle (e.g., unemployment insurance).

• Discretionary fiscal policy: Deliberate changes in government spending or taxes to achieve economic objectives.

• Examples: Stimulus checks during recessions, changes in tax rates, or increased infrastructure spending.

Key Point: The federal government’s role in total government spending has increased significantly since the Great Depression, with a large share now devoted to transfer payments.

Key Point: Most federal revenue comes from individual income and payroll taxes, while expenditures are dominated by transfer payments such as Social Security and Medicare.

Social Security and Medicare: Fiscal Time Bombs?

Social Security and Medicare have reduced poverty among the elderly, but face long-term funding challenges due to an aging population and rising healthcare costs. Solutions may include increasing taxes, reducing benefits, or raising eligibility ages.

The Effects of Fiscal Policy on Real GDP and the Price Level

How Fiscal Policy Affects Aggregate Demand

Fiscal policy influences aggregate demand (AD) through changes in government purchases and taxes:

• Expansionary fiscal policy: Increases government purchases or decreases taxes to boost AD, used when real GDP is below potential GDP (to reduce unemployment).

• Contractionary fiscal policy: Decreases government purchases or increases taxes to reduce AD, used when real GDP is above potential GDP (to reduce inflation).

Example: During the Covid-19 pandemic, the government enacted large expansionary fiscal policies to offset declines in AD and SRAS, but this contributed to higher inflation.

Fiscal Policy in the Dynamic Aggregate Demand and Aggregate Supply Model

Dynamic Model Analysis

The dynamic AD-AS model incorporates changes in potential GDP and the price level over time. Fiscal policy can shift the AD curve to maintain full employment, but may also result in higher price levels (inflation).

The Government Purchases, Tax, and Transfer Payments Multipliers

The Multiplier Effect

The multiplier effect describes how an initial change in autonomous expenditure (such as government purchases) leads to a larger change in real GDP due to induced increases in consumption.

• Government purchases multiplier: Measures the total change in GDP from a change in government spending.

• Tax multiplier: Measures the total change in GDP from a change in taxes (negative value; smaller in absolute value than the government purchases multiplier).

• Transfer payments multiplier: Positive effect on GDP, as increased transfers raise disposable income and consumption.

Formula for the government purchases multiplier:

$\text{Multiplier} = \frac{1}{1 - MPC}$

where MPC is the marginal propensity to consume.

Formula for the tax multiplier:

$\text{Tax Multiplier} = -\frac{MPC}{1 - MPC}$

Example: If MPC = 0.75, the government purchases multiplier is 4, and the tax multiplier is -3.

The Limits to Using Fiscal Policy to Stabilize the Economy

Challenges in Fiscal Policy Implementation

• Legislative delay: Time required for Congress to agree on fiscal actions.

• Implementation delay: Time required to execute large spending projects.

• Crowding out: Increased government spending may reduce private investment, consumption, and net exports by raising interest rates.

Key Point: In the long run, the effect of government purchases on real GDP is offset by reductions in private spending, but short-run increases in GDP may still be valuable.

Deficits, Surpluses, and Federal Government Debt

Budget Deficits and Surpluses

• Budget deficit: Government expenditures exceed tax revenue.

• Budget surplus: Government expenditures are less than tax revenue.

• Federal government debt (national debt): The total value of outstanding Treasury securities issued to finance past deficits.

Automatic stabilizers: Budget deficits often increase during recessions due to falling tax receipts and rising transfer payments, helping to limit the severity of downturns.

Who owns the national debt? About 40% is held by government trust funds (e.g., Social Security), 40% by U.S. investors and banks, and 23% by foreign investors.

Long-Run Fiscal Policy and Economic Growth

Supply-Side Effects of Fiscal Policy

Long-run fiscal policy aims to increase potential GDP by influencing aggregate supply. This is often achieved through tax policy that incentivizes work, saving, investment, and entrepreneurship.

• Tax wedge: The difference between pre-tax and post-tax returns to economic activity; a larger wedge reduces incentives and economic activity.

• Marginal tax rates: Higher rates can discourage labor supply and investment.

• Tax simplification: A simpler tax code can increase economic efficiency by reducing time and resources spent on tax avoidance and compliance.

Formula for long-run GDP growth:

$\text{Growth rate of real GDP} = \text{Growth rate of hours worked} + \text{Growth rate of labor productivity}$

Appendix: A Closer Look at the Multiplier

Multiplier Formulas and Extensions

• Government purchases multiplier: $\frac{1}{1 - MPC}$

• Tax multiplier: $-\frac{MPC}{1 - MPC}$

• Balanced budget multiplier: Always equals 1 in the short run (if government purchases and taxes increase by the same amount, GDP increases by that amount).

• Effect of tax rates: Lower tax rates increase the size of the multiplier.

• Open economy multiplier: The presence of imports reduces the multiplier, as some spending leaks abroad.

Example: If MPC = 0.75, tax rate t = 0.2, and marginal propensity to import (MPI) = 0.1, the multiplier is smaller than in a closed economy.

Key Point: The effectiveness of fiscal policy depends on the size of the multiplier, which is influenced by consumption behavior, tax rates, and openness to trade.