Three types of public expenditure

• Capital expenditure — spending on long-lasting assets: new hospitals, roads, railways, school buildings, defence equipment. It adds to the nation's capital stock, so it raises LRAS and productive capacity. Economically, this is the "good" spending — it is investment.
• Current expenditure — the day-to-day running costs of the public sector: public-sector wages, drugs for the NHS, textbooks, electricity bills. Recurring, consumed within the year.
• Transfer payments — money moved from one group to another with no output produced in return: the state pension, Universal Credit, child benefit. Because nothing is produced, transfers are not counted in GDP — a favourite exam trap.

Why has public spending changed? An ageing population (pensions, health and social care — the single biggest driver in the UK and most advanced economies); rising public expectations of health and education; the level of debt interest; the business cycle (recession ⟹ higher benefits, lower tax); and political choices about the size of the state.

Classify the spending

The significance of the size of public spending

The spec asks specifically about the effect of the level of public expenditure as a proportion of GDP on five things:

• Productivity and growth — capital spending on infrastructure, education and health raises productivity and shifts LRAS right. But a large state financed by high taxes may blunt incentives and reduce dynamism.
• Living standards — public goods, healthcare and education raise welfare far beyond what individuals could buy alone. But high taxes reduce disposable income.
• Crowding out — the central controversy. If the government borrows heavily, it competes with the private sector for a limited pool of loanable funds, pushing up interest rates and crowding out private investment. There is also resource crowding out: the state hiring engineers and nurses bids them away from private firms.
• The level of taxation — spending must ultimately be financed by tax (now or later), so a bigger state means a bigger tax burden.
• Equality — progressive taxes and transfer payments reduce income inequality; free healthcare and education (benefits in kind) do so even more, and raise social mobility.

The crowding-out debate, properly evaluated: the argument holds when the economy is at full capacity. In a deep recession, with idle resources and private saving high, Keynesians argue that government borrowing crowds IN private investment — the multiplier raises incomes, which raises demand, which makes firms want to invest. That "it depends on the output gap" line is worth a lot of marks.

Crowding out or crowding in?

Direct vs indirect · progressive vs regressive

• Direct taxes — levied on income and wealth, paid directly by the person who bears the burden: income tax, National Insurance, corporation tax, inheritance tax.
• Indirect taxes — levied on spending, collected by the seller: VAT, excise duties on fuel, alcohol and tobacco.

Now the incidence question — what happens to the proportion of income paid as the taxpayer gets richer?

• Progressive — the proportion of income paid in tax rises as income rises. UK income tax, with its rising marginal bands, is progressive. It reduces inequality.
• Proportional — everyone pays the same percentage (a flat tax).
• Regressive — the proportion paid falls as income rises, so it hits the poor hardest. Almost all indirect taxes are regressive: a £5 tax on a bottle of spirits is a far bigger share of a low income than of a high one.

Do not confuse them. A tax can be indirect and still be the same absolute amount for everyone — what makes it regressive is that this amount is a bigger share of a small income. And a rich person may pay far more tax in pounds under a regressive system while still paying a lower percentage. The definition is always about the proportion.

Total income tax paid

The average tax rate

Average vs marginal

The Laffer curve

Raising the tax rate does not always raise tax revenue. Two extremes make the point: at a rate of 0% the government collects nothing; at 100% nobody would bother working, so it also collects nothing. Somewhere between the two lies a revenue-maximising rate.

Why revenue falls beyond T*: the disincentive effect (why work the extra hour?); a stronger incentive for tax avoidance (legal) and evasion (illegal); the brain drain of high earners and firms to lower-tax jurisdictions; and the shift of activity into the informal economy.

Evaluate it ruthlessly. The Laffer curve is logically unarguable at the two endpoints — but nobody knows where T* is. It differs by tax, by country and over time, and estimates for the top rate of income tax vary hugely. Politicians on both sides claim it supports them. Also note the income effect pulls the other way: a higher tax rate can make people work more to maintain their target income. Whether the substitution or income effect dominates is an empirical question, not a theoretical one.

Using the Laffer curve

What else does a tax change affect?

The spec lists the variables — be ready to work through all of them.

• Incentives to work — a lower marginal income tax rate raises the reward for the extra hour (substitution effect), but the income effect may mean people work fewer hours because they can now hit their target income more easily. The net effect is ambiguous.
• Tax revenue — the Laffer curve.
• Income distribution — a shift from direct (progressive) to indirect (regressive) taxation increases inequality.
• Real output and employment — a cut in income tax raises disposable income and therefore consumption and AD. A cut in corporation tax raises post-tax profit and so investment. Both raise real output if there is spare capacity.
• The price level — a rise in VAT or excise duty raises prices directly. Note that this is a one-off rise in the price level, not permanent inflation.
• The trade balance — higher income tax cuts disposable income, so imports fall, improving the current account (an expenditure-reducing policy).
• FDI flows — a low corporation tax rate attracts multinationals (Ireland's 12.5% rate is the standard example). This is what drives tax competition between countries — and why a global minimum corporate tax rate has been negotiated.

The fiscal deficit and the national debt

This is the single most-tested distinction in Theme 4. Think of it as a bath: the deficit is the water flowing from the tap this year; the debt is the water already in the bath. Turning the tap down (cutting the deficit) still means the bath keeps filling.

Automatic stabilisers vs discretionary policy:

• Automatic stabilisers work without any government decision. In a recession, incomes fall so tax revenue falls automatically (and progressive tax means it falls more than proportionately), while benefit spending rises automatically. Both cushion the fall in AD — and both automatically widen the deficit. In a boom the reverse happens.
• Discretionary fiscal policy is a deliberate change — a new tax rate, a stimulus package, a spending cut.

The implication: a deficit that widens in a recession is not evidence of fiscal irresponsibility — it is the automatic stabilisers doing exactly the job they exist to do.

The deficit as a % of GDP

The national debt as a % of GDP

Cyclical and structural deficits

• Cyclical deficit — the part caused by the business cycle: in a recession, tax revenue falls and benefit spending rises (the automatic stabilisers). It disappears on its own when the economy recovers. Trying to close it with spending cuts during a recession is self-defeating — the cuts deepen the downturn, shrinking the tax base further.
• Structural deficit — the part that remains even when the economy is operating at full capacity (a zero output gap). It reflects a permanent mismatch between what the state spends and what it taxes. This is the part that only policy can fix — by raising taxes, cutting spending, or raising the growth rate.

Factors influencing the size of the deficit: the stage of the business cycle; discretionary policy choices; an ageing population (a structural driver — pension and health costs rise inexorably); the cost of debt interest; and one-off shocks (a financial crisis, a pandemic).

Why the size of the national debt matters: large debt interest payments crowd out spending on health and education; higher debt may push up the interest rate the government must pay (a risk premium), or trigger a credit rating downgrade; it reduces fiscal space to respond to the next crisis; and it imposes a burden on future generations.

But keep it in proportion. What matters is the debt-to-GDP ratio and the cost of servicing it, not the raw number. If the economy's growth rate exceeds the interest rate on the debt (g > r), the ratio falls over time even while running a deficit — growth is the least painful route out of debt. Japan has run debt above 200% of GDP for years without a crisis. And borrowing to fund capital spending that raises future productivity is very different from borrowing to fund current consumption.

Classify it

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Macroeconomic policies in a global context

• Measures to reduce deficits and debt (austerity): cut spending, raise taxes. Effect: AD falls, so growth and employment fall in the short run, and the fall in the tax base means the deficit may not shrink as much as hoped — the fiscal multiplier works in reverse. Austerity during a recession is therefore self-defeating; consolidation is better attempted in a boom. And cuts to benefits and public services worsen inequality.
• Measures to reduce poverty and inequality: progressive taxation, a higher minimum wage, benefits, free education and healthcare. Trade-off: the equity–efficiency tension — high marginal rates may blunt incentives and encourage avoidance or emigration.
• Changes in interest rates and the money supply: lower rates and QE boost AD and can weaken the currency (helping exports). But the liquidity trap — at very low rates, monetary policy loses its power; and QE inflates asset prices, which disproportionately benefits the already-wealthy and so worsens wealth inequality.
• Measures to increase international competitiveness: supply-side reform — education and training, infrastructure, R&D tax credits, deregulation, lower corporation tax. Slow but permanent, unlike a depreciation.
• Responding to external shocks: an oil-price spike, a pandemic, a financial crisis. Fiscal and monetary policy can cushion the blow — but a supply-side shock creates the nightmare of rising inflation and falling output at once, and a single policy instrument cannot fix both. That is the fundamental dilemma of stagflation.

Transfer pricing and the problems facing policymakers

Transfer pricing — a transnational corporation sets artificial prices for goods and services traded between its own subsidiaries, so that profit appears in the low-tax country and costs appear in the high-tax one. The result: the firm makes enormous sales in the UK but declares almost no taxable profit here.

Measures to control it: the "arm's length principle" (transactions between subsidiaries must be priced as if between independent firms); country-by-country reporting; a diverted profits tax; and international coordination on a global minimum corporate tax rate.

Limits to government ability to control global companies: TNCs are mobile — they can relocate profits, production and headquarters. Their revenues can exceed the GDP of small states, giving them enormous bargaining power. And any single country that acts alone risks losing the investment to a neighbour, which is why only international coordination works — and why it is so hard to achieve.

Problems facing policymakers generally (4.5.4d):

• Inaccurate information — data are provisional and heavily revised; the output gap cannot be observed directly, only estimated, so policymakers may not even know whether a deficit is cyclical or structural.
• Risks and uncertainties — time lags (recognition, decision, implementation, impact) mean a policy designed for a recession can arrive during the recovery, making things worse. Multipliers are uncertain.
• Inability to control external shocks — no UK government could prevent a global pandemic, an oil embargo or a US recession.

Match the term to its meaning

Tap a definition on the left, then its term on the right.

Deficit down, debt up?

The big ideas to know

You've covered the whole of Edexcel 4.5 — and with it, the entire A-level. Press Finish to see your score.