Secondary Sector
High School
Definition
The part of the economy that processes raw materials into finished goods, such as manufacturing and construction. It adds value by turning resources from the primary sector into useful products.
Worked examples
A lumber mill takes logs (primary sector) and cuts them into boards and plywood for building.
The mill transforms raw timber into usable construction materials, adding value through processing.
An automobile factory assembles steel, rubber, and glass into finished cars ready for sale.
Manufacturing combines processed materials from mining and refining into a complex final product.
Common mistakes
- Farming and logging are secondary sector activities → Farming and logging are primary sector; food processing and lumber mills are secondary The secondary sector processes raw materials — it doesn't extract them from nature.
- Retail stores selling manufactured goods belong to the secondary sector → Retail and sales are tertiary sector services Secondary makes the products; tertiary provides services including selling and distribution.
- Construction is tertiary because it provides a service → Construction is secondary because it transforms materials into finished structures Construction physically builds goods (buildings, roads) by processing raw materials like concrete and steel.
Where you'll use it next
You'll apply this when studying economic development stages, comparing industrialized and developing nations, analyzing labor shifts in history, and understanding how supply chains connect the three economic sectors.
See also
Primary SectorTertiary SectorIndustrial RevolutionEconomic SystemsGoods and ServicesMeasuring Economic Performance
Reviewed by Pat Cheng, M.Ed. — StudyPug Curriculum Lead · Last updated June 6, 2026