Classification of Businesses

Quick Summary

• Businesses are classified into 3 industrial sectors: primary, secondary, and tertiary — based on what stage of production they operate at.
• Primary = extracting raw materials (farming, mining, fishing, forestry).
• Secondary = processing/manufacturing those raw materials into products (refining oil, building cars).
• Tertiary = providing services to consumers and other businesses (banking, hospitality, retail).
• There's also a hidden sub-sector: the quaternary sector — knowledge-based services like IT, research and consultancy — which sits inside tertiary.
• Some huge businesses (like Shell) operate across all three sectors at once.
• As countries develop economically, employment shifts: primary → secondary → tertiary/quaternary. This pattern is one of the most testable ideas in this chapter.

Why Do We Even Classify Businesses Like This?

Think about it like sorting your kitchen. If everything was thrown into one giant unlabelled cupboard, comparing "how much pasta do I have" versus "how much pasta does my neighbour have" would be a nightmare. But once you sort things into labelled shelves — grains, tins, spices — comparisons become instant and meaningful.

That's exactly what sector classification does for economists and business students. By grouping businesses according to the industrial sector they operate in, we can easily compare firms doing similar types of work, and more importantly, we can compare whole economies to see how developed they are.

The Three Sectors — The Production Chain

The easiest way to remember all three sectors is to follow a single raw material on its journey from the ground to your hands. Picture a wooden chair:

The Primary Sector

Examples:

Examples: