Policies to Promote Economic Growth (Cambridge International A-Level Economics)

Introduction: two types of growth

• Actual growth - is an increase in real GDP from using existing resources more fully (AD-driven, short-run)

• Potential growth - is an increase in productive capacity of the economy (LRAS-driven, long-run)

• Policies to promote growth fall into two categories:

  • Demand-side policies (fiscal and monetary)

    • These primarily boost actual growth by shifting AD right

  • Supply-side policies (market-based and interventionist)

    • These primarily boost potential growth by shifting LRAS right

• Effective long-run growth strategy usually requires a combination of both

1. Demand-side policies

Expansionary fiscal policy

• Increase in government spending (G) or cuts in taxation (T) raise AD
• Higher disposable income raises consumption (C); lower corporation tax raises investment (I)
• Multiplier effect amplifies the initial injection

Expansionary monetary policy

• Cut in interest rates reduces cost of borrowing and return on saving

  • Raises consumption (C) — households borrow more, save less
  • Raises investment (I) — firms face lower cost of capital

• Quantitative easing increases money supply and lowers long-term yields

• Currency may depreciate, raising net exports (X-M)

Expansionary demand side policy

Diagram analysis: demand-side policies

• Economy is initially in equilibrium at AP₁Y₁ with a negative output gap (Y₁Y_FE)

• Expansionary demand-side policy shifts AD right from AD₁ to AD₂

  • Real GDP rises from Y₁ to Y₂ and the average price level rises from AP₁ to AP₂
  • Employment rises as firms hire more workers to meet the higher output

• The negative output gap narrows and the economy moves closer to full employment

2. Supply-side policies

Market-based supply-side policies

• Rely on market forces and incentives to improve efficiency

• Key tools:

  • Cuts in income tax and corporation tax to incentivise work and investment
  • Deregulation to reduce costs and encourage competition
  • Privatisation to improve efficiency through profit incentive
  • Trade union reform to improve labour market flexibility
  • Reducing unemployment benefits to incentivise job search

Interventionist supply-side policies

• Rely on direct government action to expand productive capacity

• Key tools:

  • Government spending on education and training to raise human capital
  • Infrastructure investment (transport, energy, digital) to raise productivity
  • Subsidies for R&D to promote innovation and technological progress
  • Industrial policy to support strategic sectors

Supply side policies

Diagram analysis: supply-side policies

• The economy is initially at full employment equilibrium AP₁Y_FE1
• Successful supply-side policy shifts LRAS right from LRAS₁ to LRAS₂ (and SRAS right)
• Real GDP rises from Y_FE1 to Y_FE2 — an increase in potential output
• Average price level falls from AP₁ to AP₂ — non-inflationary growth
• Employment rises as productive capacity expands and new jobs are created

The effectiveness of each policy

Key evaluation points

• Short-run vs long-run: demand-side policies deliver faster results but may be inflationary; supply-side policies are slower but produce sustainable, non-inflationary growth

• State of the economy matters:

  • In recession (spare capacity) — demand-side policies most effective as AD is the constraint
  • At full employment — supply-side policies essential as LRAS is the constraint

• Policy trade-offs: expansionary policies may worsen inflation, current account deficit, or government debt

• Keynesian vs Classical view:

  • Keynesians favour demand-side intervention when economy is below full employment
  • Classicals argue only supply-side policies can raise long-run growth; demand-side policies are purely inflationary in the long run

• Combined approach: most economies use a mix - monetary policy for short-run stabilisation, supply-side for long-run capacity

Worked Example South Korea's growth strategy (1960s - 2000s)

The context

In the 1960s, South Korea was one of the poorest countries in the world, with GDP per capita below many sub-Saharan African economies. By 2020, it had become a high-income economy and member of the OECD, with GDP per capita exceeding US$30,000.

The policy mix

South Korea's government pursued a long-term interventionist supply-side strategy:

• Heavy public investment in education — literacy rose from around 22% in 1945 to near-universal by the 1980s
• State-directed investment in heavy industry (steel, shipbuilding, electronics) through subsidised credit to chaebol (conglomerates such as Samsung and Hyundai)
• Infrastructure investment in transport, ports and telecommunications
• R&D spending rose from under 0.5% of GDP in the 1970s to over 4% by 2020 — among the highest in the world

The outcome

• Real GDP grew at an average rate of around 7% per year between 1960 and 1997 — one of the fastest sustained growth rates in history
• LRAS shifted dramatically rightward over decades as human and physical capital accumulated
• Employment rose as the economy industrialised and moved workers from agriculture into manufacturing and services

What this illustrates

South Korea demonstrates that interventionist supply-side policies, sustained over decades, can transform an economy's productive capacity. Crucially, growth was driven by LRAS expansion rather than AD stimulus — producing non-inflationary, sustainable growth

Exam Hint When a question asks about policies to promote growth, always distinguish between actual and potential growth from the outset. Demand-side policies primarily raise actual growth by closing a negative output gap - supply-side policies raise potential growth by expanding productive capacity. Confusing these loses analysis marks.

For 12-mark "assess" questions, always evaluate each policy's effectiveness using at least two criteria: time lags, the state of the economy (spare capacity vs full employment), and policy conflicts (inflation, debt, current account). A one-sided answer - e.g. "supply-side policies are best because they are non-inflationary" - caps your AO3 at Level 1.

Top-band answers compare policies directly and reach a supported judgment. For example: "In a recession with spare capacity, fiscal policy is likely more effective because the multiplier raises output without triggering inflation — but in an economy near full employment, supply-side policies are essential because further AD stimulus would simply cause inflation." Always link your judgment to the specific economic context given in the question.