Costs, Revenue, Profit and Scale
Calculating and interpreting business costs, revenue, profit, loss, economies and diseconomies of scale.
How to study for GCSE Economics
Learn each definition and diagram as a causal model, practise calculations with units, apply evidence to the stated context and qualify conclusions with realistic trade-offs.
Core concepts
Concept 1
Total cost combines fixed and variable cost; average cost is total cost divided by output; total revenue is price multiplied by quantity sold.
Exam cue: Write each formula, show substitutions and distinguish totals from averages.
Concept 2
Profit equals total revenue minus total cost, while a negative result is a loss; business objectives may also include growth or market share.
Exam cue: Trace a cost or revenue change through profit and then the producer's likely supply decision.
Concept 3
Economies of scale reduce average cost as output expands, whereas coordination or control problems can create diseconomies.
Exam cue: Name the scale mechanism—purchasing, technical, managerial, financial or risk-bearing—before explaining its effect.
Risk pitfalls and guardrails
Subtracting variable cost alone when calculating profit.
Guardrail: Do not stop at a definition or generic advantage: show the mechanism, keep units and diagram labels accurate, and separate board-specific paper claims from the England common core.
Assuming a higher selling price must increase profit regardless of sales volume.
Guardrail: Do not stop at a definition or generic advantage: show the mechanism, keep units and diagram labels accurate, and separate board-specific paper claims from the England common core.
Treating growth as proof that average cost will always fall.
Guardrail: Do not stop at a definition or generic advantage: show the mechanism, keep units and diagram labels accurate, and separate board-specific paper claims from the England common core.
Memory anchors
Total cost
Fixed cost plus variable cost.
Average cost
Total cost divided by output.
Total revenue
Price multiplied by quantity sold.
Profit
Total revenue minus total cost.
Economy of scale
An average-cost advantage arising as output increases.
Checkpoint rule
Do the check-up only after you can summarize each concept in one sentence and identify one dangerous pitfall from memory.
Knowledge Check (after reading)
Short check-up to confirm understanding of this module.
Check-up Questions
Which cost is most likely fixed for a small factory over one month?
Which is a variable cost for a café?
Answer all questions to submit.
Next step personalized recommendations
Continue learning
Move forward only after this module is stable.
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