OxfordAQA International AS and A-level Economics: Fiscal policy (9640)

Section 3.2.4.2 of the OxfordAQA International AS and A-level Economics specification (version 1.2, code 9640) covers fiscal policy, and this guide teaches it with the related quantitative skills from section 3.5. Section 3.2 is International AS content, so all of it sits in the AS part of the course. Every country, household and figure below is made up for illustration. Monetary policy and supply-side policies are separate statements (3.2.4.1 and 3.2.4.3) and are left to their own pages.

Use the course hub and the printable checklist to track progress. A shorter recall version is in the revision notes, and exam-style work is in the practice questions. If AD, AS or the multiplier feel unfamiliar, start with the macroeconomic performance revision notes, and use the free diagnostics to find gaps.

Coverage of section 3.2.4.2

Specification point	Skill needed
Manipulating spending, taxation and the budget balance	Define fiscal policy; explain deliberate deficits and surpluses
Macroeconomic and microeconomic functions	Separate demand management and growth aims from market-level aims
Influence on aggregate demand	Trace spending and tax changes through to AD, with the multiplier
Influence on aggregate supply	Explain how spending and taxes can raise productive capacity
Allocation of resources and pattern of activity	Show how taxes and spending move resources between uses
Direct and indirect; progressive, proportional, regressive	Classify taxes and calculate average rates
Budget balance and national debt	Explain the flow-and-stock link
Cyclical and structural influences	Split a deficit into the two parts

What fiscal policy is

Fiscal policy means changing what the government spends and how it raises revenue, so that the economy moves towards chosen objectives. The budget balance is revenue minus spending: a negative figure is a budget deficit and a positive figure is a budget surplus.

Governments may run deficits or surpluses deliberately to influence aggregate demand. Expansionary policy raises AD through higher spending, lower taxes, or both, and pushes the budget towards deficit. Contractionary policy lowers AD and pushes the budget towards surplus.

The specification links spending and taxation to several objectives: an equitable distribution of income, protection of the environment, low unemployment and stable economic growth. A good answer names the objective first, then the tool.

Macroeconomic and microeconomic functions

Macroeconomic functions work on the whole economy: managing the level of AD to limit unemployment and inflationary pressure, and supporting steady growth. Microeconomic functions work on particular markets and groups:

• Correcting market failure, for example taxing a good with a negative externality or subsidising one with a positive externality.
• Providing public goods and merit goods.
• Redistributing income through progressive taxes and benefit payments.

One instrument can serve both. A road-building programme adds to AD now (macro) and changes which resources serve transport rather than other uses (micro).

Influencing aggregate demand

AD = C + I + G + (X - M). Government spending (G) is a direct component. Taxes work indirectly, because they alter household disposable income and firms’ profits, and so consumption (C) and investment (I).

The multiplier makes the final change in national income larger than the first injection. Its value is 1/MPW, where the marginal propensity to withdraw is the sum MPS + MPT + MPM.

Worked example (Country D, illustrative). There is spare capacity. MPS = 0.10, MPT = 0.20, MPM = 0.20.

• MPW = 0.10 + 0.20 + 0.20 = 0.50, so the multiplier is 1 / 0.5 = 2.
• Government spending rises by 50. Income rises by 50 x 2 = 100.
• Instead, taxes are cut by 50, and households spend 70% of the extra income in the first round. The first-round injection is 50 x 0.7 = 35, so income rises by 35 x 2 = 70.

A rise in spending of the same size has the larger effect because none of it leaks into saving in the first round. That favours spending in a deep slump, although a tax cut can sometimes be arranged faster.

Diagram in words. On an AD/AS diagram, real output runs along the horizontal axis and the price level up the vertical. Expansionary policy shifts AD right, from AD1 to AD2. If the economy starts on the flat, spare-capacity stretch of short-run aggregate supply (SRAS), output rises with little price effect. Near full capacity, on the steep stretch, the price level rises more than output.

Evaluation chain. The result depends on four things.

1. Spare capacity: with a large negative output gap, extra AD raises output and employment. With a positive gap it mainly raises prices.
2. The multiplier: larger MPS, MPT or MPM shrinks the effect, and a country that imports much of what it buys leaks demand abroad.
3. Time lags: it takes time to see a problem, agree a policy and spend the money, and by then the economy may have moved on.
4. Confidence: if households expect higher taxes later, they may save a tax cut.

Influencing aggregate supply

Fiscal policy can also raise productive capacity, shifting long-run aggregate supply (LRAS) right and short-run supply with it.

• Spending on education, training, health and infrastructure raises the quantity and quality of labour and capital and lowers firms’ costs.
• Lower taxes on profits can raise investment. Lower income tax may raise the reward for working, so more people take jobs or work longer.
• Subsidies can cut costs of production in a chosen sector.

The effect is slow. Potential output rises and inflationary pressure is lower at any level of output. Evaluation points: the spending has an opportunity cost, projects can be badly chosen, and a tax cut might be spent on leisure or saved rather than turned into extra work.

Allocation of resources and pattern of activity

Spending and taxes move resources between uses, and change which sectors grow.

Worked example (Gadget fizz market, illustrative). Demand is Qd = 150 - 10P and supply is Qs = 30 + 20P.

Case	Price paid by buyers	Price received by sellers	Quantity
No tax	4	4	110
Tax of 3 per unit on sellers	6	3	90

The tax shifts supply up by 3, so supply becomes Qs = 30 + 20(P - 3). Setting 150 - 10P = 20P - 30 gives P = 6 and Q = 90. Buyers pay 2 more per unit and sellers keep 1 less (3 instead of 4). Revenue is 3 x 90 = 270, of which buyers bear 2 x 90 = 180 and sellers 1 x 90 = 90. Buyers bear more because their demand is the less responsive side of this market.

If the drink creates an external cost of 3 per unit, the tax moves the price closer to the full social cost, so output falls towards the efficient level and resources move to other uses. A subsidy does the reverse for a good with an external benefit. The revenue can fund spending elsewhere.

A higher tax on one product shifts demand to substitutes. Spending on, say, renewable energy shifts the pattern of activity towards that sector. Evaluation: the gain depends on the tax matching the real external cost, and when demand is inelastic the tax raises revenue but changes quantity only a little.

Direct and indirect taxes

• Direct taxes are paid by the person or firm on whom they fall, out of income or wealth: income tax, corporation tax.
• Indirect taxes are levied on spending, so they are collected by sellers: a sales tax, an excise duty on fuel.

Progressive, proportional and regressive taxes

A tax is progressive if the average rate (tax paid / income x 100) rises with income, proportional if it is constant, and regressive if it falls.

Worked example (Country A, illustrative). Nothing is paid on the first 12,000 of income. The rate is 25% on income from 12,000 to 45,000 and 45% above that.

Income	Tax calculation	Tax	Average rate
9,000	below allowance	0	0%
30,000	25% x 18,000	4,500	15%
80,000	25% x 33,000 + 45% x 35,000	24,000	30%

The average rate rises with income, so this tax is progressive. The marginal rate is 25% at 30,000 and 45% at 80,000. Compare a flat 18% on all income: that would be proportional.

An indirect tax can be regressive. A 10% sales tax is a fixed share of spending, but lower-income households spend a larger share of income. Household L has income 22,000 and spends 90% (19,800). Household H has income 90,000 and spends 55% (49,500). If prices include the tax, the tax is one-eleventh of the spending total.

• L pays 19,800 / 11 = 1,800, which is 8.2% of income.
• H pays 49,500 / 11 = 4,500, which is 5.0% of income.

The tax takes a falling share of income, so it is regressive against income. A system that leans on indirect taxes can therefore be less equitable than one that leans on progressive income tax.

Budget balance and national debt

The budget balance describes a single year, while the national debt is the accumulated total of past borrowing. Each deficit adds to the debt, and a surplus can reduce it.

Worked example (Country B, illustrative). GDP is 3,200, spending is 870, revenue is 822, and opening debt is 1,280.

• Deficit = 870 - 822 = 48, which is 48 / 3,200 = 1.5% of GDP.
• Closing debt = 1,280 + 48 = 1,328. The opening debt/GDP ratio is 1,280 / 3,200 = 40%.
• If the deficit stays at 48 for three years and GDP is unchanged, debt reaches 1,424 and the ratio is 44.5%.
• If nominal GDP grows 3.5% a year, debt still reaches 1,424 but GDP reaches 3,547.9, so the ratio is 40.1%.

A deficit raises the debt, but growth can hold the ratio nearly steady. A surplus of 25 in a later year would cut debt from 1,328 to 1,303. The cost of a high debt is interest payments, which use money that could pay for other spending, and possible worry among lenders.

Cyclical and structural influences

The cyclical part of the balance moves automatically with the economic cycle: in a downturn tax revenue falls and unemployment benefits rise. The structural part is what would remain at potential output.

Worked example (Country C, illustrative). Potential GDP is 2,400 and actual GDP is 2,250. Revenue is 28% of GDP. At potential output spending would be 690, but at actual output it is 20 higher.

• Output gap = (2,250 - 2,400) / 2,400 = -6.25%.
• Revenue falls from 672 to 630. Spending is 710.
• Actual deficit = 710 - 630 = 80. Structural deficit = 690 - 672 = 18. Cyclical deficit = 62.

When recovery closes the gap, 62 of the deficit disappears. The other 18 remains until taxes or spending policy change.

Common errors

• Describing a deficit as the debt. One is a yearly flow and the other a stock.
• Declaring a tax progressive just because the sum paid grows. Check the average rate.
• Using the multiplier without saying there is spare capacity.
• Calling every deficit bad. A cyclical deficit during a slump is normal.
• Giving only one side of an evaluation: always add a time lag, a cost, or a limit.

Official syllabus

Source: OxfordAQA, International AS and A-level Economics (9640), specification version 1.2, for International AS exams from May/June 2021 onwards and International A-level exams from May/June 2022 onwards. This guide covers section 3.2.4.2.