Macroeconomic policy instruments: fiscal policy, monetary policy and supply-side policy, and their effects and limitations.

What this dot point is asking

WJEC wants you to explain the three families of macroeconomic policy (fiscal, monetary and supply-side), how each works through aggregate demand or aggregate supply, and the strengths and limitations of each.

The answer

Fiscal policy

An expansionary fiscal policy (higher government spending or lower taxes) raises aggregate demand directly through G and indirectly by raising disposable income and consumption, shifting AD right to boost output and employment, usually at the cost of a larger budget deficit. A contractionary fiscal policy does the reverse to cool an overheating economy or reduce a deficit. Fiscal policy also has supply-side effects: spending on infrastructure, education and training, and tax incentives to work and invest, can raise potential output. Its limitations are time lags (especially in planning spending), the risk of crowding out private spending, the effect on public debt, and the political difficulty of raising taxes or cutting spending.

Monetary policy

A cut in the bank rate works through several channels: cheaper borrowing and lower saving returns raise consumption and investment; higher asset prices raise wealth and spending; and a lower exchange rate raises net exports. Quantitative easing (QE), used when interest rates are near zero, has the central bank buy financial assets to raise their prices, lower long-term yields and inject liquidity. Monetary policy is more flexible and quicker to change than fiscal policy and is run by an independent central bank to keep it credible. Its limitations are time lags before spending responds, the weakness of rate cuts at very low rates (the "liquidity trap"), and that it cannot easily target particular regions or sectors.

Supply-side policy

Examples include investment in education and training (raising labour productivity), infrastructure (transport, energy, digital), incentives to work, save and invest (tax reform, reducing benefit traps), deregulation and privatisation to raise efficiency and competition, and measures to improve labour-market flexibility. The attraction is that raising potential output delivers growth and lower inflationary pressure and lower unemployment and better competitiveness, easing the policy conflicts that demand-side policy faces. The drawbacks are long time lags before effects appear, high cost, uncertain results, possible increases in inequality, and the fact that supply-side policy does nothing to fill a shortfall in demand during a recession.

Examples in context

Example 1. The Bank of England, interest rates and QE. Since 1997 UK monetary policy has been set by the independent Bank of England to meet the 2 per cent inflation target. It cut interest rates to near zero and used large-scale quantitative easing after the financial crisis and during the pandemic, then raised rates sharply to fight the 2022 inflation surge. This illustrates monetary policy working through interest rates and QE, and the limits of rate cuts once rates are already very low.

Example 2. Supply-side reform and UK productivity. The UK's long-running "productivity puzzle", weak growth in output per worker, has put supply-side policy at the centre of debate: investment in skills, infrastructure (such as transport and digital connectivity) and innovation is seen as the route to faster sustainable growth without inflation. The slow, uncertain payoff from such measures, against their cost, is exactly the supply-side trade-off the exam expects you to evaluate.

Try this

Q1. Distinguish between fiscal policy and monetary policy. [2 marks]

• Cue. Fiscal policy is the government's use of spending and taxation; monetary policy is the central bank's use of interest rates, the money supply and quantitative easing.

Q2. Explain one limitation of supply-side policy. [3 marks]

• Cue. For example long time lags before effects appear, high cost and uncertain outcomes, possible increases in inequality, or that it does not address a shortfall in aggregate demand in a recession.