Governments steer aggregate demand with two levers: spending and taxes. Central banks steer it with interest rates and money supply. Master what each lever does, how fast it works, and how to read the budget balance.
Both target aggregate demand, inflation, and growth. Actors and tools differ.
Monetary policy is run by the central bank using policy rates, open market operations, reserve requirements, and quantitative easing. Decisions are fast (often monthly) and politically insulated. Transmission to the real economy is slow, working through credit, exchange rates, and asset prices.
Fiscal policy is run by the legislature and treasury using taxes and government spending. Decisions are slow (annual budgets, political bargaining). Once enacted, spending hits demand directly.
KEY: Monetary policy changes the price and availability of credit. Fiscal policy changes the level of demand directly. They can reinforce or pull against each other.
Four standard objectives:
- Provide public goods (defense, courts, basic research) that markets underprovide.
- Redistribute income through progressive taxes and transfers.
Common mistakes
- Reading the headline deficit as the policy stance. A widening headline deficit during a recession may reflect automatic stabilizers, not discretionary stimulus. Trap value: calling a 5% headline deficit "aggressive stimulus" when the structural deficit narrowed.
- Treating an equal-sized tax cut as equivalent stimulus to spending. Part of a tax cut is saved before it reaches demand, so its demand effect is smaller than spending of the same size. Trap: ranking the two packages in Example 1 as interchangeable.
- Confusing monetary and fiscal actors. Open market operations are monetary, not fiscal. A corporate tax rate change is fiscal, not monetary. Trap: tagging QE as a fiscal tool because it expands the central bank's balance sheet.
Bottom line
- Monetary policy = central bank, interest rates, money supply. Fiscal policy = government, taxes and spending.
- Fiscal policy works through aggregate demand: G up or T down expands demand; G down or T up contracts it.
- Fiscal objectives are public goods, redistribution, stabilization, and long-run growth.
- Tools: spending (transfers, current, capital) and taxes (direct, indirect). Spending hits demand faster; tax cuts depend on MPC.
Exam shortcut
When asked about policy stance, look at the structural balance, not the headline. When asked which tool hits demand fastest, choose transfers to high-MPC households or current spending; capital spending is slow. When comparing spending with an equal-sized tax cut, spending has the larger demand effect because none of the first round is saved; the tax cut's effect grows with the recipients' MPC and shrinks with leakages into saving, taxes...
The full lesson (about 2,120 words, 14 min read) adds 2 worked examples, all 6 common mistakes, a self-check, free in the app.
Learning objectives
- fiscal policy
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