Primary, Secondary and Tertiary Sectors Explained – O Level & IGCSE Business (7115 / 0450)
What Are Business Sectors?
Businesses operate in different parts of the economy called sectors.
A business sector refers to the type of economic activity a business is involved in.
There are three main sectors of industry:
Primary Sector
Secondary Sector
Tertiary Sector
Each sector plays a different role in producing goods and services.
1. Primary Sector
The primary sector involves extracting natural resources from the earth.
These businesses collect raw materials that are used by other industries.
Examples include:
Farming
Fishing
Mining
Forestry
Oil extraction
Example:
A farm that grows wheat is part of the primary sector because it produces a raw material.
2. Secondary Sector
The secondary sector involves manufacturing and processing raw materials into finished or semi-finished goods.
Businesses in this sector add value to raw materials.
Examples include:
Car manufacturing
Furniture production
Clothing factories
Food processing
Example:
A bread factory that turns wheat into bread is part of the secondary sector.
3. Tertiary Sector
The tertiary sector provides services to consumers and other businesses.
Unlike the primary and secondary sectors, this sector does not produce physical goods.
Examples include:
Banking
Education
Transportation
Tourism
Retail shops
Example:
A supermarket selling food products is part of the tertiary sector.
Summary Table
SectorActivityExamplePrimaryExtracting natural resourcesFarming, miningSecondaryManufacturing goodsCar factoriesTertiaryProviding servicesBanks, schools
How the Three Sectors Are Connected
The sectors depend on each other.
Example of the production chain:
Primary sector – Farmers grow cotton
Secondary sector – Factories turn cotton into clothes
Tertiary sector – Retail stores sell the clothes
This shows how each sector contributes to the economy.
Changes in Business Sectors
As countries develop economically:
The primary sector becomes smaller
The secondary sector grows
The tertiary sector becomes the largest
Developed economies usually have large service sectors.
Exam Tip (Cambridge Business)
Students are often asked to:
Define each sector
Give examples of businesses in each sector
Explain the difference between sectors
Always include clear examples to gain full marks.
Practice Question
Define the tertiary sector. (2 marks)
Answer
The tertiary sector includes businesses that provide services to consumers or other businesses instead of producing goods.
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