BEO6600 · Business Economics
Fiscal and Monetary Policy
Both policy levers work by shifting aggregate demand. Monetary policy is the RBA's: in the liquidity-preference money market, a vertical (RBA-set) money supply meets downward-sloping money demand, and the interest rate adjusts so the two balance. The RBA steers the cash rate to hit a 2-3% inflation target; an open-market purchase raises the money supply, lowers the rate, lifts investment and consumption, and shifts AD right. For Australia the interest-rate channel is emphasised as the most important. Fiscal policy is the government's choices on spending (G) and taxes (T). A spending rise shifts AD directly and is amplified by the spending multiplier 1/(1 − MPC) — the only computed formula here — but government borrowing pushes interest rates up and crowds out private investment, partly offsetting it. Automatic stabilisers (the tax system, unemployment benefits) cushion the cycle with no new decisions. This is group-report scope, not the closed-book exam.
What this chapter covers
- 0111.1 Policy and aggregate demand (the toolkit)
- 0211.2 The liquidity-preference money market
- 0311.3 How monetary policy transmits (open-market operation to AD)
- 0411.4 The RBA, the cash rate and the 2-3% inflation target
- 0512.1 The spending multiplier 1/(1 - MPC)
- 0612.2 The crowding-out effect
- 0712.3 Active stabilisation and automatic stabilisers
- 08An Australian policy application (stimulus + RBA rate cuts)
Worked example: sizing the multiplier, then deducting crowding-out
- +1(a) Multiplier = 1 ÷ (1 − MPC) = 1 ÷ (1 − 0.8) = 1 ÷ 0.2 = 5.
- +1(b) Maximum AD effect = initial spend × multiplier = $20bn × 5 = up to $100bn.
- +1(c) Crowding-out: higher government spending raises money demand; with a fixed money supply the interest rate is bid up, which discourages private investment. That lost investment partly offsets the spending boost, so the actual AD shift is smaller than $100bn.
- +1Why $100bn is only a ceiling: the multiplier is the upper bound before crowding-out claws some back; markers reward naming both the multiplier and the offset.
- +1(d) Automatic stabilisers cushion AD with no new decision — chiefly the tax system (collections fall automatically as incomes fall) and rising unemployment benefits. They lean against the cycle instantly, sidestepping policy lags.
Key terms
- Liquidity-preference money market
- Keynes's theory that the interest rate adjusts to balance the supply and demand for money. The money supply is fixed by the central bank (a vertical curve); money demand slopes down because the interest rate is the opportunity cost of holding money; their crossing sets the interest rate.
- Cash rate
- The interest rate on overnight loans between banks, the RBA's policy instrument. The RBA steers the cash rate to achieve a 2-3% inflation target on average over time; from it, effects spread through transmission channels (the interest-rate channel is most important for Australia) before reaching inflation and activity.
- Spending multiplier
- The factor by which a change in government spending changes aggregate demand: 1 ÷ (1 − MPC), where MPC is the marginal propensity to consume. One dollar of extra spending raises AD by more than a dollar through induced rounds of consumption; a higher MPC gives a bigger multiplier (MPC = 0.8 gives 5). This is the only macro-policy number the course computes.
- Crowding-out
- The offset that weakens fiscal policy: higher government spending raises money demand, which with a fixed money supply bids the interest rate up, reducing private investment. The net AD shift is therefore smaller than the naive multiplier predicts — markers reward naming both the multiplier and crowding-out.
- Automatic stabilisers
- Features of the budget that cushion aggregate demand in a downturn with no new decision required. The chief one is the tax system: as incomes fall in a recession, tax collected falls automatically, propping up disposable income; unemployment benefits behave similarly. They lean against the cycle instantly, sidestepping the lag problem.
Fiscal and Monetary Policy FAQ
How does monetary policy actually move the economy?
Through a clean chain. The RBA changes the money supply (say an open-market purchase that increases it); with money demand fixed, the larger supply clears at a lower interest rate; cheaper borrowing lifts investment and interest-sensitive consumption; and more spending at every price level shifts AD right, raising output and the price level. Tightening reverses every step. For Australia the interest-rate channel is emphasised as the most important transmission route.
What does the RBA actually target — the cash rate or inflation?
Inflation. The cash rate is the tool, not the goal: the RBA adjusts the cash rate to achieve a 2-3% inflation target on average over time, under an agreement between the Governor and the Treasurer, with the statutory basis in the Reserve Bank Act 1959. In a report, say the RBA 'adjusts the cash rate to achieve its inflation target', not that it 'targets the cash rate'. A credible target also anchors inflation expectations, which are an SRAS shifter.
How do I compute the spending multiplier?
Use 1 ÷ (1 − MPC), where MPC is the marginal propensity to consume — the fraction of each extra dollar of income households spend. One dollar of extra government spending sets off round after round of induced consumption, so the total effect is larger than the initial dollar. A higher MPC means a longer chain and a bigger multiplier: MPC = 0.5 gives 2, MPC = 0.8 gives 5. This is the only macro-policy number the course asks you to compute.
Why is fiscal policy weaker than the multiplier alone suggests?
Because of crowding-out. When the government spends more, it raises the demand for money; with the money supply fixed, the interest rate is bid up, and higher rates discourage private investment. That lost investment partly offsets the spending boost, so the net AD shift is smaller than the naive multiplier predicts. Markers reward naming both forces — the multiplier that amplifies fiscal policy and the crowding-out that claws some back.
Is fiscal and monetary policy on the closed-book exam?
No. This material (Sessions 11-12) falls after the Session 9 exam, which covers Sessions 1-8 only, so it is assessed through the 30% group report and presentation. The one formula you actually compute is the spending multiplier; everything else — the money market, transmission, the inflation target, crowding-out, stabilisers — is reasoning and diagrams.
Exam move
Frame both levers as ways to shift AD. For monetary policy, learn the transmission chain (money supply up → rate down → investment and consumption up → AD right) and tie it to the RBA's 2-3% inflation target and the interest-rate channel; remember the cash rate is the means, inflation the goal. For fiscal policy, compute the multiplier 1/(1 − MPC) — the only number here — then always deduct crowding-out, since markers reward naming both the amplification and the offset. Add a judgement on policy lags and automatic stabilisers. Because this is a 30% group report, label every money-market and AD-AS diagram fully — both axes, all curves and every equilibrium point. Treat the Australian stimulus application as a worked case: the multiplier at work, crowding-out via higher rates, and the long-run distortion of a prolonged subsidy.
