4.6 Economic Growth

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4.6 Economic Growth

Economic growth is the annual increase in a country's output (GDP). It can happen by using resources better (demand-pull growth) or by having more/better resources (supply-side growth). Governments use different policies to encourage growth, but growth itself brings both major benefits and serious costs.

Quick Overview

GDP formula: C + I + G + (X – M) — the four engines of economic activity
Two types of growth: Demand-pull (movement toward PPC) vs supply-side (PPC shifts outward)
Recessions: 6+ months of declining output — caused by falling demand or supply shocks
Growth benefits: Higher incomes, lower poverty, more employment — but also inflation, inequality, and environmental damage
Policies: Governments use fiscal (tax/spending), monetary (interest rates), and supply-side policies

Measures of Economic Growth

What Is Economic Growth?

Economic growth is the annual increase in the level of national output as measured by gross domestic product (GDP). In other words, it's asking: "Did the country produce more stuff this year than last year?"

GDP Definition

GDP = the total value of all goods and services produced in an economy in one year.

If a country's GDP grows by 2% year-on-year, that's economic growth of 2%. If it shrinks, that's economic decline (or a recession).

The Components of GDP

GDP isn't some mysterious number — it's built from four real sources of spending in an economy:

GDP = C + I + G + (X – M)

C = Consumption (what households spend)
I = Investment (what firms spend on machinery, buildings)
G = Government spending (salaries, schools, hospitals)
X – M = Net exports (exports minus imports)

Here's what each piece means:

Consumption (C): All the money households spend on goods and services — shopping, restaurants, cinema tickets, holidays. This is usually the biggest piece of GDP.
Investment (I): Firms spending on capital goods — factories, computers, vehicles, buildings. Not shares or savings. This is what creates future productive capacity.
Government Spending (G): Money the government spends on things like teacher salaries, road building, NHS care. Important: This does NOT include transfer payments (benefits, pensions) because no new output is being created — money is just moving from one person to another.
Net Exports (X – M): The difference between what the country exports (sells abroad) and imports (buys from abroad). If exports are £100bn and imports are £90bn, net exports = £10bn.

Why this matters: If any component increases, GDP grows and economic growth occurs. If consumer confidence rises and people spend more, C goes up → GDP goes up. If firms build new factories, I goes up → GDP goes up. This is fundamental to understanding what policies governments can use.

Which Component Matters Most?

Different countries weight these components differently. In the UK, they break down roughly like this:

Consumption: 60% — households are the economy's biggest spenders
14%

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Also in the full note

Causes & Consequences of Growth
Causes & Consequences of Recessions
Policies to Generate Economic Growth
What to Memorise
Concepts Checklist
Exam Tips & Common Mistakes
Real GDP vs Nominal GDP
GDP Per Capita — Growth Per Person

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4.6 Economic Growth