4.6 Economic Growth

2026 Syllabus Objectives

By the end of this topic, you should be able to:

  • 4.6.1 & 4.6.2 — Define economic growth and explain how Real GDP and GDP per capita are used to measure it
  • 4.6.3 — Explain what a recession is and how it moves the economy within its Production Possibility Curve (PPC)
  • 4.6.4 — Explain the causes of economic growth, including changes in total demand, investment, technology, and the quantity and quality of factors of production
  • 4.6.5 — Evaluate the costs and benefits of economic growth
  • 4.6.6 — Describe and assess policies used to promote economic growth

4.6.1 & 4.6.2 — Defining and Measuring Economic Growth

https://cambridgeassistant.com

What is Economic Growth?

Economic growth means an economy is producing more goods and services than it did before. Think of it as a country getting better at making things and providing services over time.

There are two types of economic growth:

  • Actual economic growth — An increase in the current output of an economy. The country is producing more right now, using resources it may not have been using before.
  • Potential economic growth — An increase in the economy's productive capacity (its maximum possible output). This happens in the long run when the economy becomes capable of producing more than it ever could before.

What is GDP?

GDP (Gross Domestic Product) is the total value of all goods and services produced in a country within one year. It is the most common way to measure the size of an economy.

GDP can be calculated using the expenditure method:

GDP = C + I + G + (X − M)

Where:

  • C = Consumption — spending by households on goods and services
  • I = Investment — spending by firms on capital goods (machinery, equipment, buildings)
  • G = Government spending — spending by the government on public services (e.g. schools, hospitals)
  • X − M = Net exports — the value of exports minus the value of imports

If any of these components increases, GDP is likely to rise, leading to economic growth.

Nominal GDP vs. Real GDP

Here is an important distinction you must understand:

  • Nominal GDP — The value of all goods and services produced, measured at current prices. This is not adjusted for inflation (rising prices). If prices go up but output stays the same, nominal GDP still rises — which is misleading.

  • Real GDP — The value of all goods and services produced, adjusted to remove the effect of inflation. This gives a truer picture of whether the economy is actually producing more.

Example: If prices rise by 20% in a year but output does not change, nominal GDP rises by 20% — but real GDP stays the same, because no extra goods were produced.

Real GDP is a better measure of economic growth because it shows whether actual output has increased, not just prices.

Formula to Calculate Real GDP:

Real GDP=Nominal GDP×Price Index (Base Year)Price Index (Current Year)\text{Real GDP} = \text{Nominal GDP} \times \frac{\text{Price Index (Base Year)}}{\text{Price Index (Current Year)}}

Formula for the Rate of Economic Growth:

Rate of Economic Growth=GDP2−GDP1GDP1×100\text{Rate of Economic Growth} = \frac{GDP_2 - GDP_1}{GDP_1} \times 100

Worked Example:

YearNominal GDPPrice Index
2016 (Base Year)$800 billion100
2017$900 billion110

Step 1 — Nominal Growth Rate: 900−800800×100=12.5%\frac{900 - 800}{800} \times 100 = 12.5\%

Step 2 — Real GDP for 2017:

\frac{900 \times 100}{110} = \$818.18 \text{ billion}

Step 3 — Real Growth Rate: 818.18−800800×100=2.27%\frac{818.18 - 800}{800} \times 100 = 2.27\%

So while nominal GDP grew by 12.5%, the real growth rate was only 2.27% — a much more honest figure.

Sign in to view full notes