Compare firm types, mergers and economies of scale
Classify firms, distinguish merger directions and explain how scale affects average cost.
Section 3.4 · Firms
Cambridge IGCSE Economics 0455 / IGCSE (9–1) Economics 0987, 2027–2029 Version 1. Apply each model to the stated evidence and qualify conclusions where effects depend on context. Practice is original and self-checked; it is not a Cambridge paper, mark scheme or official grade.
Before you begin
- No prior economics study is assumed. Read the scenario for the decision-maker, the market or economy involved, the time period and the evidence supplied.
Work on paper. Try each question before revealing help, and explain why your method works.
Quick readiness check
What can diseconomies of scale do to average cost?
What you will learn
- Compare firm size and sector
- Classify horizontal, vertical and conglomerate mergers
- Explain economies and diseconomies of scale
Firms differ by activity and ownership
Firms may operate in primary, secondary or tertiary activity and in public or private ownership. Small firms can be flexible and close to customers; large firms may have finance and purchasing advantages but can be harder to coordinate.
A horizontal merger joins firms at the same stage or in the same industry; vertical joins firms at different stages of a supply chain; conglomerate joins unrelated activities.
Scale can lower or raise average cost
Internal economies of scale are cost advantages within a growing firm, such as purchasing or technical economies. External economies arise from growth of the industry around the firm.
Diseconomies can occur if communication, control or coordination become harder. An average-total-cost diagram can show falling average cost followed by a possible rise; growth does not guarantee economies.
Pause and explain
A firm grows and negotiates lower input prices. What is this likely to be?
Worked example
A furniture retailer merges with a furniture manufacturer. Classify the merger and suggest one benefit and one risk.
Show the worked solution
- The firms operate at different stages of the same supply chain.
- This is a vertical merger.
- Coordination may improve, but integration can be costly.
Answer It is a vertical merger. It may improve coordination or secure supply, but integration costs and reduced supplier choice could offset gains.
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Test this topic →From guided practice to a new situation
Write your answer and reasoning first. Use a hint only if you are stuck. The model solution is for self-checking; your written work is not automatically marked.
Classify a merger between a farm and a supermarket that sells its produce directly.
Give me a hint
Identify whether the firms are at the same or different stages.
Compare my reasoning
- The farm produces the crop.
- The supermarket retails the crop.
- The firms are at different supply-chain stages, so the merger is vertical.
It is a vertical merger because farming and retailing are different stages of the supply chain.
Look for these in your work
- Activities identified
- Stages compared
- Merger class correct
A national firm has lower purchasing costs but slower decisions than before. Explain both outcomes using scale.
Give me a hint
Connect size to bargaining and coordination.
Compare my reasoning
- Large orders may improve bargaining power.
- More management layers can delay communication.
- The firm may gain economies and diseconomies at the same time.
The firm's size may create purchasing economies, while added management layers create coordination costs. Scale can bring both advantages and disadvantages.
Look for these in your work
- Cost advantage explained
- Coordination cost explained
- Both effects acknowledged
A group buys unrelated firms in food delivery and mobile-phone repair. Classify the merger and explain why diversification does not guarantee lower costs.
Give me a hint
Identify activity relationship, then assess integration and shared resources.
Compare my reasoning
- The activities are unrelated, so it is conglomerate.
- Diversification may spread risk.
- The firms may have few shared inputs and integration may add complexity.
It is a conglomerate merger. It may diversify revenue, but unrelated operations may offer few shared-cost economies and can be difficult to manage together.
Look for these in your work
- Merger type correct
- Possible benefit considered
- Cost limitation considered
Common mistakes
- Calling every merger vertical
- Assuming a larger firm always has lower average costs
- Confusing public-sector ownership with a public limited company
What can you explain now?
What is a merger between firms in unrelated activities called?
Compare with the explanation
Conglomerate
The firms do not share the same stage or related chain.
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Make it stick
What is a merger between firms in unrelated activities called?
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