Every year a government decides two numbers: how much it will spend and how much it will take in tax. Those two numbers look like accounting. They are not. Together they decide how much demand exists in the economy, who carries the burden of paying for the state, and whether the next generation inherits a debt or a surplus. Fiscal policy is the deliberate use of those two levers to steer the economy.
Fiscal policy
The use of government spending and taxation to influence the level of economic activity and to achieve macroeconomic aims.
The definition must contain both spending and taxation. Answers that say only 'changing taxes' are treated as incomplete, because a change in government spending with no tax change is still fiscal policy. Adding the purpose, that it is used to influence total demand, secures the second mark where two are available.
The government budget
The budget is simply the plan for revenue and spending over a year. Where tax revenue exceeds government spending there is a budget surplus. Where spending exceeds revenue there is a budget deficit, and the shortfall has to be borrowed. Accumulated deficits, added up over many years and net of any repayment, make up the national debt. A deficit is a flow measured over a year; the national debt is a stock measured at a point in time. Confusing the two is one of the most common errors in this topic.
Budget balance = total tax revenue - total government spendingA positive figure is a surplus, a negative figure is a deficit, and a figure of zero is a balanced budget. Cambridge does not print formulae in any 9708 paper, so this and every other expression in this note has to be recalled.
Governments spend for reasons that go well beyond managing demand. They provide public goods that no firm would supply, such as defence and street lighting. They provide merit goods such as healthcare and education that would otherwise be under-consumed. They pay transfer payments such as pensions and unemployment benefit, which redistribute income rather than buy output. And they invest in infrastructure, which raises the economy's productive capacity over the long run. Recognising which type of spending a question is about matters, because transfer payments do not directly add to aggregate demand while government purchases of goods and services do.
Government spending is also divided into current and capital spending. Current spending pays for the day-to-day running of public services and is used up within the year: the wages of teachers and nurses, medicines, and fuel for police vehicles. Capital spending is investment in assets that last for many years, such as new roads, hospitals, schools and railways. The distinction matters because capital spending adds to the economy's productive capacity, so borrowing to fund it is easier to justify than borrowing to fund current spending, and many governments set fiscal rules that treat the two differently.
Types of tax
Governments tax for more reasons than simply raising money, and the syllabus expects them set out. Taxes raise revenue to pay for government spending. They discourage the consumption of demerit goods, such as tobacco and alcohol, by raising their price. They redistribute income, since a progressive tax takes more from the rich. They help manage the economy, since raising or cutting taxes changes total demand. They can protect domestic industries, since tariffs make imports dearer. And they can correct externalities, such as a tax on pollution that makes the polluter pay for the damage done.
A direct tax is levied on income or wealth and is paid straight to the government by the person or firm on whom it falls, as with income tax and corporation tax. An indirect tax is levied on spending and is collected by the seller, as with value added tax and excise duties on fuel and tobacco. The distinction matters because the burden of an indirect tax can be shifted onto the consumer through a higher price, whereas the burden of a direct tax cannot be passed on so easily.
Taxes are also classified by how the burden changes as income rises. A progressive tax takes a rising proportion of income as income rises, so higher earners pay a larger share of what they earn. A proportional tax takes the same proportion at every income. A regressive tax takes a falling proportion as income rises, so it falls hardest on the poor. Most indirect taxes are regressive in effect, because a low earner spends a larger fraction of their income than a high earner does.
Progressive and regressive describe the proportion of income paid, not the amount. A rich person buying petrol pays more tax in absolute terms than a poor person, and candidates routinely conclude from this that fuel duty is progressive. It is regressive, because that larger amount is a smaller share of a much larger income. Always frame the answer in percentages.
Average rate of tax = (total tax paid / total income) x 100 Marginal rate of tax = (change in tax paid / change in income) x 100A tax is progressive when the marginal rate exceeds the average rate, proportional when they are equal, and regressive when the marginal rate is below the average rate. This test is the quickest way to classify a tax system from a data table.
Classifying a tax system from its bands
A country taxes income at 0% on the first $10,000, 20% on income between $10,001 and $50,000, and 32% on income above $50,000. Calculate the average and marginal rates of tax for a worker earning $60,000 and state whether the system is progressive.
Expansionary and contractionary fiscal policy
Expansionary fiscal policy means raising government spending, cutting taxes, or both. It increases total demand in the economy and is used when output is weak and unemployment is rising. Contractionary fiscal policy, sometimes called deflationary fiscal policy, means cutting spending or raising taxes. It reduces total demand and is used when the economy is overheating and inflation is climbing. The same instruments serve different aims depending on which direction they are pushed.
Fiscal policy is asked to do several jobs at once, and they do not always point the same way. Governments use it to promote economic growth, to reduce unemployment, to control inflation, to redistribute income from rich to poor through progressive taxes and welfare payments, and to improve the current account of the balance of payments. Cutting taxes to reduce unemployment will also raise inflationary pressure and pull in imports. That tension between objectives is where evaluation marks live.
Draw a circular flow of income diagram for an economy with a government sector. Label the flows between households and firms, then add taxation as a withdrawal and government spending as an injection. Mark clearly which arrow the government controls in each case.
The purpose of drawing it is to see why the two levers pull in opposite directions. Taxation takes money out of the flow, so raising it reduces the income circulating. Government spending puts money in, so raising it increases the income circulating. A budget deficit means injections from the government exceed withdrawals, which is why an unbalanced budget in that direction expands the economy.
A government cuts income tax rates and raises spending on infrastructure. This is best described as:
Which statement correctly distinguishes a budget deficit from the national debt?
How fiscal policy reaches the economy
At AS the mechanism has to be stated through aggregate demand rather than asserted. Aggregate demand is the total planned spending on domestic output at each price level, made up of consumption, investment, government spending and net exports. Government spending is a component in its own right, so a change in it shifts aggregate demand directly. Taxation works indirectly: income tax alters disposable income and therefore consumption, while corporation tax alters retained profit and therefore investment. Naming the component that moves is the step that converts a description into analysis.
AD = C + I + G + (X - M)Fiscal policy acts on G directly, on C through income tax and benefits, on I through corporation tax and investment allowances, and on M indirectly, since higher disposable income raises spending on imports as well as on domestic output.
How expansionary fiscal policy reduces demand-deficient unemployment
- The government raises spending on infrastructure and cuts the basic rate of income tax.
- Government spending G rises directly, and lower income tax raises households' disposable income.
- Higher disposable income raises consumption C, since some proportion of any extra income is spent rather than saved.
- Aggregate demand shifts right, because both G and C are components of AD.
- Firms respond to higher orders by raising output, since inventories are being run down.
- Labour is a derived demand, so producing more output requires employing more workers.
- Employment rises and demand-deficient unemployment falls, while real GDP increases.
- The initial spending becomes income for construction workers and suppliers, who spend a share of it in turn, so the final rise in national income exceeds the initial injection.
AO2 analysis carries 40% of the marks, and it is the linking that earns them. The weakest version of this answer is 'the government spends more so unemployment falls'. Every arrow above is a separate creditable step.
Practise this chain →Draw an AD/AS diagram showing an economy operating below full employment. Show the effect of expansionary fiscal policy, labelling the shift of AD, the change in real output and the change in the price level. Then repeat the shift on a diagram where AS is near-vertical.
The point of drawing it twice is the comparison. On the elastic section of AS most of the shift becomes extra real output with little price rise. Near full capacity the same shift is absorbed almost entirely by a higher price level, so the policy delivers inflation instead of growth. Examiners reward candidates who make the outcome depend on where the economy currently sits rather than assuming the convenient case.
Not all fiscal changes are decisions. Automatic stabilisers are features of the tax and benefit system that moderate the cycle without anyone acting. In a downturn, incomes fall so income tax receipts fall, and unemployment rises so benefit payments rise. Both effects support disposable income and cushion the fall in aggregate demand, and both widen the deficit automatically. In a boom the same mechanisms run in reverse and restrain demand. Discretionary fiscal policy, by contrast, is a deliberate change of tax rates or spending plans announced by the government. Questions frequently hinge on separating the two, because a deficit that widens in a recession may reflect no policy decision at all.
Almost every fiscal policy answer improves if you state the starting position of the economy. The same tax cut is expansionary and largely non-inflationary in a deep recession, and almost purely inflationary at full capacity. Candidates who write 'the effect depends on the amount of spare capacity in the economy' and then use it are consistently in the higher bands.
During a recession a country's budget deficit widens even though the government has announced no change to tax rates or spending plans. The most likely explanation is:
Applied context
The scale of discretionary fiscal action during the pandemic response of 2020 and 2021 gave a rare natural experiment. Governments across advanced and emerging economies ran deficits of a size normally seen only in wartime, largely through transfer payments and wage support rather than public investment. Output recovered quickly once restrictions lifted, which supports the case for fiscal expansion when demand has collapsed. The subsequent inflation across those same economies is contested territory, since supply chain disruption and energy prices were operating simultaneously, and separating the fiscal contribution from those is not straightforward.
Use applied material to support a specific analytical point, not as decoration. A candidate who cites this to argue that fiscal expansion is effective against a demand shock but that its inflationary consequences depend on the state of supply is using it properly.
The multiplier
The multiplier is the reason a fiscal injection changes national income by more than the injection itself. Money spent by the government becomes income for someone else, who spends a share of it, generating income for a third party, and so on in a converging series. The size of the effect depends entirely on how much of each round of income leaks out of the circular flow through saving, taxation and imports rather than being passed on. A high marginal propensity to withdraw means a small multiplier, which is why the same fiscal package produces very different results in a highly open economy and a relatively closed one.
k = 1 / (1 - MPC) or equivalently k = 1 / MPW, where MPW = MPS + MPT + MPM and change in Y = k x initial injectionMPC is the marginal propensity to consume domestic output, MPS to save, MPT the marginal tax rate and MPM the marginal propensity to import. The two forms are equivalent because everything not spent on domestic output is withdrawn. Formulae are not provided in any 9708 paper, so both forms and the relationship between them have to be recalled.
Calculating the multiplier and the change in national income
In an open economy the marginal propensity to save is 0.15, the marginal rate of tax is 0.20 and the marginal propensity to import is 0.05. The government increases spending by $40 billion. Calculate the multiplier and the resulting change in national income, then state what happens to your answer if the marginal propensity to import doubles.
Why the theoretical effect may not arrive
Crowding out: how a fiscal expansion can cancel itself
- The government raises spending without raising taxes, so it must finance the gap by borrowing.
- It issues bonds, which increases the demand for loanable funds in the financial market.
- With the supply of loanable funds given in the short run, the increased demand raises the market rate of interest.
- Investment is inversely related to the rate of interest, since a higher rate means fewer projects clear their hurdle rate of return.
- Private sector investment I therefore falls, and interest-sensitive consumption such as mortgage-financed housing falls with it.
- The rise in G is partly or wholly offset by the fall in I and C, so aggregate demand shifts right by less than the initial injection.
- The effective multiplier is smaller than the arithmetic multiplier suggests, and in the extreme case of full crowding out, national income does not rise at all.
The counter-argument is as important as the chain itself. Crowding out requires the supply of loanable funds to be constrained. In a recession with idle savings and a central bank holding rates near the lower bound, the mechanism is weak, and government borrowing may crowd in private investment by raising expected demand. Set out the chain, then state the condition under which it bites.
Practise this chain →Timing is the second reason the textbook effect fails to arrive intact. A recognition lag runs from the moment the economy turns to the moment the data confirm it, and national accounts are published with a delay and then revised. An implementation lag follows, since tax changes and spending programmes usually require a budget and legislation, and infrastructure projects take years to reach the point of spending money. An impact lag then separates the spending from its full effect through the multiplier. By the time an expansionary package is working at full strength the recession it was designed to fight may be over, and the stimulus then arrives into a recovery, amplifying the next boom rather than damping the last slump. Monetary policy suffers the first two lags far less severely, which is one of the strongest arguments for assigning demand management to a central bank.
A deficit also has to be interpreted before it can be judged. The cyclical component of a deficit is the part caused by the economy operating below trend, arising from automatic stabilisers and disappearing as output recovers. The structural component is what remains when output is at its trend level, and it does not disappear without a change of policy. Only the structural part represents a genuine long-term imbalance between what a government has promised to spend and what it is willing to raise in tax. This distinction is the reason most fiscal rules are written in cyclically adjusted terms: a rule requiring the headline budget to balance every year would force tax rises in a recession, deepening the very downturn that caused the deficit.
Fiscal policy also has a supply side, and the strongest answers refuse to treat it as purely a demand instrument. Cuts to corporation tax and capital allowances are intended to raise investment and therefore the capital stock. Cuts to marginal income tax rates are intended to strengthen work incentives. Spending on education, training and infrastructure raises productivity. All of these shift long-run aggregate supply right rather than moving along it, which raises output without the inflationary consequence of a pure demand expansion. The Laffer curve captures the associated revenue argument: since a tax rate of zero and a tax rate of 100% both raise nothing, revenue must rise and then fall as the rate increases, so beyond some rate a tax cut could raise revenue. The theoretical shape is uncontroversial; where any given economy sits on the curve is not, and no reliable method exists for locating the peak.
Applied context
The eurozone crisis of 2010 to 2015 is the sharpest available test of fiscal consolidation during a downturn. Members of a monetary union cannot devalue and do not set their own interest rates, so fiscal contraction was the principal adjustment tool available to Greece, Portugal, Ireland and Spain. Output fell substantially in the countries that consolidated fastest, and debt-to-GDP ratios in several cases rose rather than fell, because the denominator contracted alongside the numerator. That episode drove a substantial revision in official estimates of fiscal multipliers, which had been assumed to be well below one and appeared in practice to be considerably larger in depressed conditions. The counter-argument is that these economies faced rising borrowing costs and had limited alternatives, so the comparison is not against a costless expansion.
This example is valuable precisely because it cuts both ways. Using it to argue that austerity is always self-defeating overstates it; using it to argue that the multiplier is state-dependent, and larger when the economy is depressed, is a defensible and well-evidenced analytical claim.
Fiscal policy connects outward more widely than almost any other topic on the specification. It cannot be assessed in isolation from monetary policy, since the two can reinforce or cancel each other and the interest rate response determines whether crowding out occurs at all. It runs into the balance of payments, because a fiscal expansion raises imports through the marginal propensity to import and worsens the current account, and because higher interest rates from bond issuance attract capital inflows and appreciate the currency, weakening net exports further. It overlaps with supply-side policy, since investment in infrastructure and human capital is simultaneously a fiscal instrument and a supply-side one. And it carries directly into equity and redistribution, because the choice between progressive direct taxation and regressive indirect taxation determines who bears the cost of any given consolidation.
9708-5.3 · 9708-5.4 · 9708-6.3 · 9708-6.4 · 9708-8.2 · 9708-10.2
Assess whether fiscal policy is the most effective means of achieving the macroeconomic objective of full employment. (13 marks)
- Define and frameDefine fiscal policy and full employment, and distinguish demand-deficient unemployment from structural and frictional unemployment. State the criterion for effectiveness up front: fiscal policy can only address the demand-deficient component, so the answer turns partly on which type of unemployment the economy actually has. Flag that effectiveness will be judged against monetary and supply-side alternatives.
- Analysis: the case forRun the transmission chain from G and C through AD to derived demand for labour, supported by an AD/AS diagram on the elastic section of AS. Add the multiplier, quantifying it if data are given. Note that government spending is a direct injection and does not depend on the private sector choosing to respond, which is its key advantage over monetary policy when confidence is weak.
- Analysis: the alternativesTreat both alternatives seriously. Monetary policy acts faster, has shorter recognition and implementation lags, and can be reversed quickly, though it is ineffective at the lower bound and relies on interest-sensitive spending responding. Supply-side policy is the only instrument that addresses structural unemployment, through retraining and improved labour mobility, but it works over years rather than quarters.
- EvaluationWeigh the limitations against each other rather than listing them. Crowding out matters when loanable funds are constrained and barely at all in a slump, so its force depends on the state of the economy. Time lags may deliver the stimulus into a recovery. The multiplier is smaller in an open economy and smaller again when confidence is weak. There is an opportunity cost in higher borrowing and future debt servicing, and a conflict with the inflation objective as the economy nears capacity. Against all this, weigh the fact that fiscal policy is the only instrument that works when interest rates cannot fall further.
- JudgementReach a conclusion conditional on stated circumstances. Fiscal policy is most effective where unemployment is demand-deficient, spare capacity is substantial, the economy is relatively closed and monetary policy is constrained. It is least effective where unemployment is structural, capacity is tight, or the economy is small and open. The strongest conclusions argue for a combination, with fiscal policy supplying demand in the short run and supply-side measures addressing the structural component, and specify which conditions make that combination necessary.
AO3 evaluation carries 30% of the marks on Papers 2 and 4, and Paper 4 essays are unstructured, so the discipline of allocating time has to come from you. Roughly a third of writing time belongs in the final two sections. A conclusion that repeats the analysis without adjudicating between the arguments will not reach the top level however good the analysis was.
Is a budget deficit actually a problem?
- The composition matters more than the size. Borrowing to fund infrastructure and education raises future productive capacity and future tax revenue, so the debt may partly finance itself. Borrowing to fund current consumption does not, and leaves the liability without the asset.
- Sustainability depends on the relationship between the interest rate on debt and the growth rate of nominal GDP, not on any absolute threshold. Where growth exceeds the interest rate, the debt-to-GDP ratio can fall even while the government runs a deficit. Where the interest rate exceeds growth, the ratio rises even under a primary surplus. Against this, the interest rate is not fixed and can move sharply once markets doubt sustainability.
- Whether debt is owed domestically or externally changes the burden materially. Domestically held debt is a transfer between residents, whereas external debt requires a genuine transfer of resources abroad and exposes the government to currency risk if the debt is denominated in a foreign currency.
- Consolidating during a downturn can be self-defeating, since a large multiplier means output falls alongside the deficit and the debt ratio may not improve. Set against this, delaying consolidation indefinitely risks rising borrowing costs, and a government that loses market confidence loses the option of choosing its own timing.
- The intergenerational objection has genuine force where borrowing funds current consumption, since a future generation services debt from which it gained nothing. It has much less force where borrowing funds assets that generation inherits and uses.
- The strongest answers judge a deficit against the state of the economy and the use to which the borrowing is put, rather than against a fixed number. A 6% deficit funding investment in a deep recession and a 3% deficit funding current spending at full employment are not comparable positions, and treating the smaller figure as automatically safer is exactly the error the cyclical and structural distinction exists to prevent.
The single most common failure on fiscal policy essays is answering as though the economy were in a recession when the question has not said so. Read the stem for the starting position, and where it is not specified, make the answer conditional and say so explicitly. Examiners credit a candidate who writes 'if the economy is operating close to full capacity then the same expansion is largely absorbed by prices' far more than one who assumes the favourable case and produces a fluent one-sided answer.