Preview
IB DP Economics — Unit 3: Macroeconomics | SL | 3.6 Demand Management — Fiscal Policy
📋 What You Will Learn
- Define fiscal policy and distinguish between its two main instruments: government spending and taxation
- Explain the difference between expansionary and contractionary fiscal policy and identify when each is used
- Analyse the Keynesian spending multiplier and its role in amplifying fiscal policy effects
- Apply AD/AS diagrams to show the macroeconomic effects of fiscal policy on output, employment, and the price level
- Distinguish between automatic stabilisers and discretionary fiscal policy
- Evaluate the effectiveness and limitations of fiscal policy as a demand management tool
🔍 Guiding Question Can governments reliably steer the macroeconomy toward full employment and price stability by adjusting their spending and taxation — or do the limitations of fiscal policy undermine its effectiveness?
🌍 Why This Matters In 2021, the United States government passed the American Rescue Plan — a $1.9 trillion fiscal stimulus package including direct payments to households, extended unemployment benefits, and infrastructure spending. By 2023, US unemployment had fallen to 3.4%, a 54-year low. But inflation had also surged to 9.1% in 2022, prompting the Federal Reserve to raise interest rates aggressively. One fiscal intervention; two very different macroeconomic consequences. Understanding when and how fiscal policy works — and when it overshoots — is one of the central debates in modern economics.
What Is Fiscal Policy?
Every government must decide how much to spend and how much to tax. These decisions are not merely administrative — they directly alter the level of aggregate demand in the economy. Fiscal policy is the deliberate use of these decisions to achieve macroeconomic objectives.
📖 Definition — Fiscal Policy Fiscal policy refers to the use of government spending and taxation by the government to influence the level of aggregate demand (AD) in the economy, with the aim of achieving macroeconomic objectives such as economic growth, full employment, and price stability.
Fiscal policy operates through two instruments. The first is government spending (G) — expenditure on public goods, infrastructure, welfare transfers, and public services. The second is taxation (T) — direct taxes on income and wealth, and indirect taxes on spending. Together, these determine the government's budget position .
📖 Definition — Budget Deficit, Surplus, and Balance
- Budget deficit: government spending exceeds tax revenue (G > T) — the government borrows to finance the shortfall
- Budget surplus: tax revenue exceeds government spending (T > G) — the government collects more than it spends
- Balanced budget: government spending equals tax revenue (G = T)
📌 Note — Fiscal Policy vs Monetary Policy Fiscal policy is controlled by the government (Ministry of Finance / Treasury). Monetary policy is controlled by the central bank (e.g. Federal Reserve, Bank of England). Both aim to manage AD, but through different instruments. This distinction matters in exam answers — never confuse the two.
Expansionary Fiscal Policy
When the economy is operating below its potential output — during a recession or deflationary gap — the government can use fiscal policy to stimulate aggregate demand. This is expansionary fiscal policy.
📖 Definition — Expansionary Fiscal Policy Expansionary fiscal policy involves an increase in government spending and/or a decrease in taxation, resulting in a budget deficit (or a smaller surplus), with the aim of increasing aggregate demand to close a deflationary (recessionary) gap.
Mechanisms of Expansionary Fiscal Policy
- Increase in government spending (G↑): directly increases the G component of AD = C + I + G + (X − M); raises demand for goods and services, stimulating output and employment
- Decrease in direct taxes (T↓): raises household disposable income → increases consumption (C↑); raises business after-tax profits → may increase investment (I↑)
- Decrease in indirect taxes: lowers the price of goods → increases consumer spending (C↑) and real purchasing power
- Transfer payments increase: higher welfare benefits, unemployment payments → increases disposable income of