9.2 Economic Growth and Sustainability

2026 📋 Syllabus Objectives

By the end of these notes, you should be able to:

  1. Explain the difference between actual growth and potential growth in national output
  2. Explain positive and negative output gaps
  3. Describe the business (trade) cycle — its phases, causes, and the role of automatic stabilisers
  4. Discuss policies to promote economic growth and evaluate their effectiveness
  5. Define inclusive economic growth, explain its impact on equity and equality, and describe policies to promote it
  6. Define sustainable economic growth, explain the use and conservation of resources, describe the impact of growth on the environment and climate change, and outline policies to reduce that impact

📘 Main Content

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🔷 Objective 1: Actual Growth vs. Potential Growth in National Output

What is Economic Growth?

Economic growth means the economy is producing more goods and services over time. We measure this by looking at national output — the total amount of goods and services a country produces, usually measured as GDP (Gross Domestic Product).

There are two very different types of economic growth, and it is important to understand how they differ.

Actual Economic Growth

Actual economic growth is the real increase in national output that actually happens in an economy over a period of time. In other words, it is the increase in what the economy is actually producing right now.

  • It is shown on a diagram as a movement from inside the Production Possibility Curve (PPC) towards the curve itself, or along the curve.
  • It happens when unused resources (like unemployed workers or idle machinery) are brought back into use.
  • It can also be shown on an Aggregate Demand / Aggregate Supply (AD/AS) diagram as a rightward shift in Aggregate Demand (AD) — meaning people, firms, and the government are spending more.

💡 Think of it this way: Imagine a factory that has workers sitting idle and machines switched off. When those workers and machines start producing again, that is actual growth — the economy is making better use of what it already has.

Potential Economic Growth

Potential economic growth is the increase in the maximum possible output an economy could produce if all its resources were fully used. It is about expanding the economy's capacity — its ability to produce.

  • It is shown on a diagram as an outward shift of the PPC — the boundary moves outward, meaning the economy can now produce more than before even if it uses all resources.
  • It happens when there is an increase in the quantity or quality of factors of production (land, labour, capital, enterprise).
  • Examples include: building new factories, improving education so workers become more skilled, adopting new technology, or discovering new natural resources.

💡 Think of it this way: Instead of just switching idle machines back on, the factory buys brand new, better machines. Now the factory can produce far more than it ever could before — that is potential growth.

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