Fiscal policy refers to the idea that changes in:[Fill in the blank]

Question

BlackTom AI · Accepted Answer

Fiscal policy concerns government spending and taxation—how changes in these choices influence aggregate demand (AD) in the economy.

1. Relevant knowledge points and concepts
- Aggregate demand equals the total demand for goods and services: AD = C + I + G + (X − M), where C is consumption, I is investment, G is government purchases, and (X − M) is net exports.
- Fiscal policy is the use of government purchases (G) and tax policy to influence economic activity (AD, output, employment, inflation).
- Monetary policy (central bank actions) controls interest rates and the money supply, not directly government spending or taxes.

2. Step‑by‑step reasoning
- Changing government purchases (G) directly changes AD because G is a component of AD. An increase in G raises AD by that amount (and usually more through the multiplier); a decrease lowers AD.
- Changing taxes affects disposable income, which affects consumption (C). Lower taxes raise disposable income and C, thus increasing AD; higher taxes reduce C and AD.
- Therefore fiscal tools (G and taxes) are mechanisms to shift the AD curve and stabilize output and inflation.

3. Calculations / intermediate steps (conceptual)
- If government spending rises by ΔG and the marginal propensity to consume is MPC, the total AD effect ≈ ΔG × (1 / (1 − MPC)). This is the fiscal multiplier showing how changes in G produce larger changes in AD.

4. Why the correct answer is correct
- Option b explicitly identifies government purchases and taxing policy as the instruments that affect aggregate demand—this is the textbook definition of fiscal policy.

5. Why the other options are incorrect
- a: The Reserve Bank of Australia (central bank) implements monetary policy (interest rates), not fiscal policy.
- c: The statement that the price level affects the equilibrium interest rate pertains to money market equilibrium and monetary theory, not fiscal policy.
- d: Exchange rate effects on net exports describe an open‑economy channel for AD but do not define fiscal policy; exchange rate policy is separate (often monetary or exchange‑rate policy).

Conclusion: The correct choice is b. Government purchases and taxing policy can affect aggregate demand, which matches the provided answer.

Fiscal policy refers to the idea that changes in:[Fill in the blank]单项选择题

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