WJEC A-Level Economics Evaluating Economic Models and Policies (A2 Unit 4): a deep dive on macro models, growth, inflation, the balance of payments, policy, development and the global economy

What this unit actually demands

Evaluating Economic Models and Policies is the synoptic A2 unit, assessed by three essays (one each from Microeconomics, Macroeconomics, and Trade and Development). You must build extended, well-structured arguments, use models and diagrams to analyse, and reach supported judgements that weigh both sides. The unit draws together material from across the course, so synoptic links matter, and evaluation, not description, earns the top marks.

This guide ties together the nine dot-point pages for the unit: aggregate supply and the Phillips Curve; economic growth; unemployment; inflation and deflation; the balance of payments; fiscal policy and public debt; monetary policy and financial stability; economic development; and global economics. Each has its own page with worked questions; this overview shows how they fit.

Aggregate supply and the Phillips Curve

Short-run aggregate supply slopes up; long-run aggregate supply is vertical (Neo-Classical) or L-shaped (Keynesian). The short-run Phillips Curve shows an inflation-unemployment trade-off; the long-run curve is vertical at the natural rate, because rising inflation expectations shift the short-run curve up. Stagflation broke the simple trade-off; only supply-side policy lowers the natural rate.

Economic growth

Actual growth is realised real GDP; potential growth is rising capacity; the output gap is the difference. Growth follows the trade cycle and has demand-side and supply-side causes. It raises living standards but can be environmentally damaging, unequal and inflationary, so sustainability and the type of growth matter.

Unemployment

Unemployment is measured by the Labour Force Survey and the claimant count. Its types, cyclical, structural, frictional, real-wage and seasonal, have different causes, so the right policy differs: demand-side for cyclical, supply-side for structural and frictional.

Inflation and deflation

Inflation (measured by the CPI) is demand-pull or cost-push, with costs to incomes, savings, competitiveness and certainty. Deflation is malign (demand-side, dangerous) or benign (supply-side, from productivity), so it is not always harmful.

The balance of payments

The current account covers goods, services, primary and secondary income. A deficit can reflect lost competitiveness, strong demand or an overvalued currency. Corrective policies are expenditure-reducing, expenditure-switching (depreciation, protection) and supply-side, the last being the most sustainable.

Fiscal policy and public debt

A budget deficit is a flow; the national debt a stock. A cyclical deficit self-corrects; a structural one needs action. Automatic stabilisers dampen the cycle; crowding out and debt-interest costs are risks. Whether to cut a deficit depends on the cycle.

Monetary policy and financial stability

Monetary policy works through the transmission mechanism (borrowing, wealth, the exchange rate); QE is used when rates near zero. The financial sector fails through moral hazard, systemic risk and asset bubbles, justifying regulation, which itself has costs.

Economic development

Development is broader than growth, measured by the HDI. Barriers include the savings gap, poor infrastructure, weak human capital and commodity dependence. Strategies (aid, FDI, liberalisation) each have benefits and drawbacks and must be evaluated.

Global economics

Trading blocs deepen through free trade areas, customs unions, single markets and monetary union, with trade creation and trade diversion. The EU, the eurozone, the WTO and the terms of trade shape the environment for UK and Welsh trade.

How this unit is examined

A typical WJEC profile for A2 Unit 4:

• Three essays, one each from Microeconomics, Macroeconomics, and Trade and Development.
• Extended evaluation. Build balanced arguments and reach supported judgements.
• Synoptic links. Draw together models and material from across the course.

Check your knowledge

A mix of questions covering the whole unit. Attempt them under timed conditions, then check against the solutions.

1. State what the short-run Phillips Curve shows. (2 marks)
2. Define a negative output gap. (2 marks)
3. Name two types of unemployment. (2 marks)
4. Define cost-push inflation. (2 marks)
5. Name the four components of the current account. (2 marks)
6. Distinguish between a budget deficit and the national debt. (2 marks)
7. State the three components combined in the Human Development Index. (2 marks)
8. Define a customs union. (2 marks)