Exam Notes Sample: Macroeconomics Revision Notes

Model Answer

1. Core Macroeconomic Objectives

• Governments typically pursue four core objectives: economic growth (a sustained rise in real GDP), low and stable inflation (the UK’s Bank of England targets 2% CPI inflation), low unemployment, and a satisfactory balance of payments position on the current account.
• These objectives often conflict in the short run — the classic example is the trade-off between inflation and unemployment described by the Phillips curve — so policymakers must prioritise and accept trade-offs, particularly over election cycles.
• Real GDP measures output adjusted for inflation and is the standard measure of an economy’s size and growth; nominal GDP is unadjusted and can rise even when real output falls if prices rise fast enough.
• GDP can be measured three equivalent ways: the output method (sum of value added across all industries), the income method (sum of wages, profits, rent and interest), and the expenditure method (C + I + G + (X − M)) — all three should, in theory, give the same total.
• Economists distinguish GDP per capita (output divided by population, a rough proxy for living standards) from headline GDP, which can rise simply through population growth without any improvement in average welfare.

2. Aggregate Demand and Aggregate Supply

• Aggregate demand (AD) is total planned expenditure on domestic goods and services: AD = C + I + G + (X − M), where C is consumption, I is investment, G is government spending, X is exports and M is imports.
• AD slopes downward: a lower price level raises real money balances, real wealth and export competitiveness, increasing quantity demanded.
• Short-run aggregate supply (SRAS) slopes upward as firms respond to higher prices by increasing output, given sticky wages and costs; long-run aggregate supply (LRAS) is vertical at the economy’s potential output, determined by the quantity and quality of factors of production, not the price level.
• Equilibrium occurs where AD meets SRAS, determining the short-run price level and real output simultaneously (see Figure 1); a rightward shift of AD, with SRAS unchanged, raises both the price level and output, while a leftward shift of SRAS raises the price level but lowers output — the combination examiners call “stagflation”.
• Common AD shifters: consumer/business confidence, interest rates, exchange rates, government spending and taxation, and global demand for exports. Common SRAS shifters: wage costs, raw material and energy prices, and indirect taxes/subsidies.

Figure 1: Equilibrium price level (P*) and output (Y*) where aggregate demand (AD) meets aggregate supply (AS).

3. Economic Growth and the Business Cycle

• Economic growth can be short-run (using spare capacity, moving AD along a given SRAS) or long-run (an outward shift of LRAS from more/better capital, labour, technology or institutions).
• The business cycle describes fluctuations in real GDP around its long-run trend, through four phases: expansion, peak, contraction (recession if GDP falls for two consecutive quarters), and trough.
• An output gap is the difference between actual and potential GDP: a positive (inflationary) gap suggests overheating and rising inflationary pressure; a negative (recessionary) gap suggests spare capacity, higher unemployment and downward pressure on prices.
• Sources of long-run growth include capital investment (physical and human), technological progress, labour force growth and improvements in institutions/productivity; economists debate how much weight each factor deserves in explaining differences in growth rates between countries.

4. Inflation and Unemployment

• Inflation is a sustained rise in the general price level, measured in the UK primarily via the Consumer Prices Index (CPI); demand-pull inflation arises from excess AD, while cost-push inflation arises from rising input costs shifting SRAS left.
• Unemployment is measured via the claimant count and the Labour Force Survey (ILO measure); types include frictional (between jobs), structural (skills/location mismatch), cyclical (demand-deficient, linked to the business cycle) and seasonal.
• The Phillips curve depicts a short-run trade-off between inflation and unemployment; the long-run Phillips curve is generally treated as vertical at the natural rate of unemployment, implying no permanent trade-off is available to policymakers.

5. Fiscal Policy

• Fiscal policy uses government spending and taxation to influence AD; expansionary fiscal policy (higher spending or lower taxes) shifts AD right, used to close a negative output gap; contractionary fiscal policy shifts AD left to cool an overheating economy.
• A budget deficit occurs when government spending exceeds tax revenue in a given year; the national debt is the accumulated stock of past deficits, financed largely through government bonds (gilts in the UK).
• Automatic stabilisers (e.g. unemployment benefits, progressive income tax) reduce fluctuations without new legislation, rising automatically in a downturn and falling in a boom.

6. Monetary Policy

• Monetary policy is set by the Bank of England’s Monetary Policy Committee, primarily through changes to the Bank Rate (the base interest rate) to hit the 2% CPI inflation target.
• Raising interest rates increases the cost of borrowing and the return on saving, reducing consumption and investment, shifting AD left and easing inflationary pressure — and vice versa when rates are cut.
• Quantitative easing (QE) is an unconventional tool used when interest rates are already very low: the central bank purchases assets (mainly government bonds) to inject money into the economy and lower long-term borrowing costs.
• Central bank independence (the Bank of England has operational independence over the Bank Rate, though the inflation target itself is set by government) is intended to keep interest-rate decisions free from short-term political pressure, improving policy credibility.

7. Exchange Rates and the Balance of Payments

• The exchange rate is the price of one currency in terms of another; a stronger pound makes UK exports more expensive abroad and imports cheaper at home, worsening the trade balance, all else equal.
• The balance of payments records all transactions between UK residents and the rest of the world, split into the current account (trade in goods/services, income, transfers) and the capital/financial account (investment flows).
• A persistent current account deficit means a country imports more than it exports (plus net income/transfers), which must be financed by inflows on the financial account, e.g. foreign investment or borrowing.
• Under a floating exchange rate (as with sterling), the rate is determined by market supply and demand for the currency; under a fixed exchange rate, the central bank commits to intervening (buying/selling reserves) to hold the rate at a target level.

8. Supply-Side Policies

• Unlike fiscal and monetary policy, which manage AD, supply-side policies aim to increase LRAS by raising the economy’s productive potential — shifting the vertical long-run curve rightward rather than moving along it.
• Market-based supply-side policies reduce government intervention: deregulation, privatisation, lower income/corporation tax to strengthen work and investment incentives, and reforms to increase labour market flexibility.
• Interventionist supply-side policies use active government spending: investment in education and skills training, infrastructure spending, and support for research and development and innovation.
• Supply-side policies tend to work with a long time lag — often years rather than months — which is a key limitation examiners expect you to raise when evaluating their effectiveness against faster-acting demand-side tools.

Exam Tips

• Always draw and label an AD/AS diagram fully (axes, curves, equilibrium point) when a question involves a shock or policy change — diagrams typically carry dedicated marks separate from the written explanation.
• State clearly whether a shock shifts AD or AS, and in which direction, before describing the effect on price level and output — markers look for this sequencing explicitly.
• Distinguish short-run and long-run effects: a demand-side policy can close an output gap quickly but cannot raise potential output, which requires supply-side measures.
• Learn the formulae box exactly; a correctly labelled calculation is usually worth more marks than a long written explanation of the same concept.
• When asked to evaluate a policy, always give at least one limitation (time lags, imperfect information, conflicting objectives) rather than only describing how the policy is meant to work.
• Keep fiscal, monetary and supply-side policy clearly separated in your answer plan: fiscal and monetary policy manage AD in the short run, while supply-side policy targets LRAS over the long run — mixing them up is a very common lost-marks error.
• When a question gives real-world data (e.g. a CPI figure or an interest rate change), always plug it into the relevant formula from the Key Formulae box rather than discussing the concept only in words.