IGCSE Geography / Economic activity and energy

The four economic sectors

Edexcel International GCSE Geography (4GE1), chapter 4: Economic activity and energy, specification point 4.1a. Free lesson.

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Economic activity is divided into four sectors according to the type of work being done. Knowing the difference helps you classify jobs and understand employment structure without confusing it with a country's output.

What the four economic sectors do

Economic activity means any work that earns money. To classify a job, ask what the work produces. Primary work takes raw materials, which are natural resources that have not yet been processed, from the land or sea. Secondary work makes those materials into products or builds. Tertiary work provides a service. Quaternary work uses knowledge and information. Quaternary jobs are often included within tertiary because both are services. Primary: farmer, miner, fisher or forester. Secondary: car assembly worker, steelworker or builder. Tertiary: teacher, nurse, shop worker or bus…

How one T-shirt passes through the sectors

A product can involve all four sectors as it moves from a raw material to something people use. The first two sectors are easiest to tell apart by asking whether the material is being taken from nature or processed. A farmer grows cotton in the primary sector. A machinist sews the cotton cloth into a shirt in the secondary sector. A driver delivers the shirt and a shop worker sells it in the tertiary sector. A scientist researches a new fabric in the quaternary sector.

How to distinguish primary from secondary work

The material being used does not decide the sector by itself. What matters is what the worker does to it. Taking a raw material from nature is primary work. Processing that material or making it into something is secondary work. A forester felling a tree is in the primary sector because the tree is taken from nature. A sawmill worker cutting the tree into planks is in the secondary sector because the wood is being processed.

What employment structure measures

Employment structure is the share of a country's workers in each economic sector. The shares are written as percentages and add up to 100%. These percentages count workers, not money. In the UK in 2025, about 1% of workers were in the primary sector, 16% in the secondary sector and 83% in the tertiary sector. The tertiary figure includes quaternary workers.

How employment differs from output

Employment is the share of workers in an activity. Output is the share of the money a country makes from that activity. A large share of workers does not necessarily mean the same share of output. In Ethiopia in 2025, farming employed about 60% of workers but made about 33% of the country's output. Check whether a question asks about employment or output.

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