3.5 Firms

2026 Syllabus Objectives

By the end of this topic, you should be able to:

3.5.1 Classify firms by primary, secondary, and tertiary sectors; private and public sector; and relative size
3.5.2 Explain the advantages, disadvantages, and challenges facing small firms, and why they continue to exist
3.5.3 Describe how firms grow internally and externally
3.5.4 Explain horizontal, vertical, and conglomerate mergers with examples, advantages, and disadvantages
3.5.5 Explain how internal and external economies and diseconomies of scale affect firms and industries

A firm is a business organisation that combines factors of production (land, labour, capital, and enterprise) to produce goods or services.

An industry is a group of firms all producing the same type of product. For example, the car industry includes Toyota, Volvo, and Ford.

The economy is divided into three main sectors based on the type of work being done:

Primary Sector

Secondary Sector

This involves taking raw materials and turning them into finished or semi-finished goods (goods that are partly made).
It covers manufacturing and construction.
Examples: car manufacturing, textile (clothing) factories, steel production, house building

Tertiary Sector

This involves providing services — things you cannot physically touch or hold.
It is the third and final stage of production.
Examples: banking, insurance, teaching, retailing (selling), tourism, transport

💡 Quick Memory Trick: Think of it as a chain — Primary extracts, Secondary makes, Tertiary serves.

The Chain of Production links all three sectors together. For example:

Oil is extracted from the ground (primary) → refined into petrol at a refinery (secondary) → transported and sold at a petrol station (tertiary).

Quaternary Sector (a sub-section of tertiary)

Involves the collection, processing, and transmission of information — essentially the information technology (IT) sector.
Example: software companies, data analytics firms.