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.
