The three sectors: primary to tertiary
Every business is classified by the type of ACTIVITY it carries out, into one of three sectors. Primary extracts or grows raw materials from nature (farming, fishing, mining, oil). Secondary manufactures or processes raw materials into goods (car making, food processing, construction). Tertiary provides services (shops, banks, transport, tourism). Classify by activity, not by size or legal form.
Interdependence: the chain of production
The sectors are interdependent, linked in a chain of production that adds value at each stage. Primary extracts the raw material (a farm grows wheat); secondary turns it into a product (a bakery turns flour into bread); tertiary distributes and sells it (a lorry delivers it, a shop sells it, a bank finances it). Each stage adds value. A problem in one sector — a poor harvest — can disrupt those further along the chain.
Sectors' relative importance changes
The relative importance of the sectors changes over time. In many developed economies the secondary sector has shrunk while tertiary (services) has grown to be by far the largest — a shift called deindustrialisation, driven by rising incomes, cheaper overseas manufacturing and automation. Many developing economies are growing their secondary sector. Importance is measured by share of output or employment.
Drawn from real examiner reports.
Classify by activity, not size or form
Sector depends ONLY on the type of activity, never on the firm's size or legal form. A large plc can be primary, secondary or tertiary; a sole trader can be in any sector too. The question is: does the business EXTRACT raw materials, MAKE a product, or provide a SERVICE? Do not answer with a legal-form word such as Ltd — that names the ownership type (1.2).
A shop is tertiary, not secondary
The secondary/tertiary boundary is the most confused. Secondary means MAKING a physical product (manufacturing, processing, construction) — a furniture maker and a car plant are secondary. Tertiary means providing a SERVICE — a furniture shop and a car dealership are tertiary because they SELL, they do not make. Selling and transporting are services, not manufacturing.
A firm can span several sectors
Do not assume every business sits in exactly one sector. Some large firms operate in more than one — e.g. a business that grows coffee (primary), roasts and packs it (secondary) AND runs its own cafes (tertiary). Such a firm is vertically integrated. When classifying, look at each activity: a single company can appear in two or three sectors.
Extract is primary; process is secondary
The primary/secondary boundary trips candidates too. Primary EXTRACTS or grows raw materials from nature — mining iron ore, drilling oil, catching fish, growing wheat. Secondary PROCESSES those materials into goods — iron ore into steel, refining oil, milling wheat into flour. Extracting is primary; changing the material into a product is secondary.
Interdependence works both ways
Interdependence is not a one-way street from primary to tertiary. Every sector relies on the others: a secondary manufacturer needs raw materials from primary AND tertiary services (banks, transport, retailers). A farm (primary) needs tertiary transport and banking too. A problem in tertiary can also disrupt primary and secondary businesses.
Tertiary growth is not decline
A common misconception is that the primary sector is the most important, and that a large or growing tertiary (services) sector signals weakness. In fact, in most developed economies the tertiary sector is the LARGEST by output and employment, and its growth reflects rising incomes and demand for services — a sign of development, not decline. Services add value too.
Name the sector, then apply it
On State or Outline items do not just name the sector — link it to a specific detail from the case (a named product, activity or fact). Tertiary because Willowbrook Grocers SELLS groceries rather than making them applies it to the firm. Naming the business is not context.
On Analyse, build a cause-effect chain
On a 6-mark Analyse (AO2 + AO3) identify the sector, then develop a consequence for THIS business as a chain of cause and effect — e.g. relying on primary for raw materials exposes a manufacturer to supply shocks that raise costs and squeeze profit. Develop one chain fully.
Justify/Evaluate need a supported judgement
On a 9-mark Justify which option, choose ONE option and say why it is better for the named firm; on a 12-mark Evaluate, weigh both sides and conclude why one outweighs the other. A no-decision answer stays in the middle band. Finish with a clear, conditional judgement.
Businesses are classified by the type of activity they carry out — not by their size or legal form — into three sectors.
| Sector | What it does | Examples |
|---|---|---|
| Primary | extracts or grows raw materials from nature | farming, fishing, forestry, mining, oil and gas extraction |
| Secondary | manufactures or processes raw materials into goods | car making, food processing, construction, furniture making |
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