Who this is for: Cambridge IGCSE Economics (0455) students who confuse cost types, revenue and profit — and lose marks on calculation and explanation questions.
What query it owns: how to understand firms, production, cost and revenue in Cambridge IGCSE Economics.
Why this is safe: this page owns the revision-guide angle, while Tutopiya’s Firms, Production, Cost and Revenue subtopic page owns the learning resource and the free quiz owns the practice.

Firms, production, cost and revenue is the microeconomics core that links how businesses produce goods to the money they earn and spend. Cambridge IGCSE Economics (0455) expects you to distinguish fixed and variable costs, calculate total revenue and profit, and explain how output decisions affect a firm’s finances. This guide maps each concept to the command words examiners use.

Key takeaways

• Fixed costs (FC) do not change with output; variable costs (VC) do.
• Total cost (TC) = FC + VC; average costs divide TC by output.
• Total revenue (TR) = price × quantity sold.
• Profit = TR − TC (loss when TC exceeds TR).
• Firms aim to produce where revenue covers costs; break-even is where TR = TC.

What are firms, production, cost and revenue in Cambridge IGCSE Economics?

A firm is a business organisation that combines factors of production to make goods or services. Production is the process of converting inputs (labour, capital, land) into output. Costs are what the firm pays to produce; revenue is income from sales. Cambridge IGCSE Economics (0455) treats these as the foundation for profit, pricing and market behaviour questions throughout the Microeconomic Decision Makers topic.

Read the full notes and diagrams on Tutopiya’s Firms, Production, Cost and Revenue subtopic page before attempting past-paper questions.

Fixed, variable and total costs

Cost type	Definition	Example
Fixed costs (FC)	Do not change when output changes	Rent, salaries of permanent staff
Variable costs (VC)	Change directly with output	Raw materials, piece-rate wages
Total costs (TC)	FC + VC at any output level	Sum of all production spending
Average cost (AC)	TC ÷ output (Q)	Cost per unit produced

Example: FC = $500, VC = $2 per unit, output = 200 units → TC = 500 + (2 × 200) = $900; AC = 900 ÷ 200 = $4.50 per unit.

Revenue and profit

Term	Formula	Meaning
Total revenue (TR)	Price × quantity	Income from sales
Average revenue (AR)	TR ÷ Q (= price)	Revenue per unit
Profit	TR − TC	Surplus after all costs
Loss	TC − TR (when TC > TR)	Shortfall when costs exceed revenue

A firm selling 300 units at $10 each earns TR = $3,000. If TC = $2,800, profit = $200.

How to answer cost and revenue questions — step by step

1. Identify whether the question asks about costs, revenue or profit.
2. Classify costs as fixed or variable before calculating TC.
3. Apply TR = price × quantity and profit = TR − TC.
4. Check units — dollars, units sold, per-unit costs must be consistent.
5. Test yourself with the Firms, Production, Cost and Revenue quiz once calculations are reliable.

Past-paper wording: command words that matter

Command word	What the question wants	Typical stem
Define	Precise term	”Define fixed costs.”
Distinguish between	Two contrasting concepts	”Distinguish between fixed costs and variable costs.”
Calculate	Use a formula	”Calculate the total revenue if 400 units are sold at $5 each.”
Explain	Cause and effect	”Explain why average cost falls as output increases in the short run.”

Worked exam-style stems (how to answer the wording)

1. “A firm has fixed costs of $1,000 and variable costs of $3 per unit. Calculate total cost when output is 500 units.” TC = FC + VC = 1,000 + (3 × 500) = 1,000 + 1,500 = $2,500. Mark-scheme reward: correct formula and arithmetic.

2. “Define total revenue.” Total revenue is the income a firm receives from selling its output, calculated as price multiplied by quantity sold. Reward: price × quantity stated clearly.

3. “Explain one reason why a firm may continue to produce in the short run even when making a loss.” Fixed costs must still be paid even if production stops; as long as price covers variable costs, continuing reduces the loss compared with shutting down. Reward: fixed costs + variable-cost coverage logic.

How this topic connects to the rest of IGCSE Economics

Firms, production, cost and revenue builds on Classification of Firms and leads into Market Structures, where pricing power depends on costs and revenue. The Cambridge IGCSE Economics resource hub links every subtopic in the 0455 syllabus.

Common mistakes students make

• Treating all costs as variable (rent and insurance are usually fixed).
• Calculating profit as price − cost instead of TR − TC.
• Forgetting that average revenue equals price in most IGCSE contexts.
• Confusing total cost with average cost in calculation questions.
• Saying a firm “makes no profit” when TR = TC — that is break-even, not profit.

When you need more support

If cost-and-revenue calculations keep costing marks, work through the Firms, Production, Cost and Revenue quiz, then get focused help from a Cambridge IGCSE Economics tutor.

Frequently asked questions

What is the difference between fixed and variable costs? Fixed costs stay the same regardless of output; variable costs change as production increases or decreases.

How do you calculate profit in IGCSE Economics? Profit = total revenue minus total cost (TR − TC). If TC is greater, the firm makes a loss.

What is break-even output? The level of output where total revenue equals total cost — the firm makes neither profit nor loss.

Is firms, production, cost and revenue hard in 0455? Not if you learn the four formulas (TC, TR, profit, AC) and practise classifying costs — that covers most exam questions.

Ready to master Cambridge IGCSE Economics firms, production, cost and revenue?

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