The four sectors differ according to the main economic activity performed: primary-sector businesses extract natural resources, secondary-sector businesses transform resources into products, tertiary-sector businesses provide services, and quaternary-sector businesses provide knowledge-based services. This is IB Business Management subtopic 1.1.2 and applies to both SL and HL.
How the Four Sectors Differ
Economic activity can be understood as a chain that moves from obtaining raw materials to manufacturing products and providing increasingly specialized services.
| Sector | Main activity and examples |
|---|---|
| Primary | Extracts or harvests natural resources. Examples include farming, fishing, forestry, mining, and oil extraction. |
| Secondary | Processes raw materials or manufactures physical products. Examples include food processing, construction, car manufacturing, and clothing production. |
| Tertiary | Provides services to consumers or other businesses. Examples include retailing, transport, banking, tourism, and healthcare. |
| Quaternary | Provides knowledge-based services involving information, research, or advanced expertise. Examples include software development, data analytics, scientific research, and management consultancy. |
A smartphone illustrates how the sectors connect. Mining companies extract lithium and metals in the primary sector; manufacturers convert these materials into components and phones in the secondary sector; retailers and delivery companies sell and distribute the phones in the tertiary sector; and software developers or technology researchers operate in the quaternary sector.
A common misconception is that every technology business belongs to the quaternary sector. Classification depends on its main activity: a factory manufacturing computers is secondary, while a company developing artificial intelligence software is quaternary. Large businesses may also operate across several sectors.
Exam Technique
The syllabus assigns this content to AO2, so an “explain” question requires more than listing definitions. State each sector's activity, give an accurate business example, and explain why that example belongs there. When using a case study, classify the organization by the activity described in the stimulus rather than by its brand name.