Demand, Markets and Elasticity
Market size, share and growth, demand and supply influences, price and income elasticity, and their use and limitations in decisions.
How to study A-level Business
Start with the objective and context, build a causal chain across functions, use the numerical and qualitative evidence, then reach a balanced, feasible judgement.
Core concepts
Concept 1
Market size, growth and share provide different information about a firm's position and opportunity.
Exam cue: Use percentage changes consistently and interpret sign, magnitude and business consequence.
Concept 2
Price elasticity of demand estimates responsiveness of quantity demanded to price; income elasticity estimates responsiveness to income.
Exam cue: Relate elasticity to likely total-revenue movement rather than treating it as a complete pricing rule.
Concept 3
Elasticity informs pricing, capacity and product decisions but estimates depend on data, time horizon, substitutes and market definition.
Exam cue: Separate a movement along a demand curve from a shift in demand.
Risk pitfalls and guardrails
Using absolute changes instead of percentage changes in elasticity.
Guardrail: Do not give a generic advantage or recommendation without explaining why it matters for this organisation, stakeholder and time horizon.
Assuming inelastic demand guarantees a profitable price rise.
Guardrail: Do not give a generic advantage or recommendation without explaining why it matters for this organisation, stakeholder and time horizon.
Confusing market share growth with market growth.
Guardrail: Do not give a generic advantage or recommendation without explaining why it matters for this organisation, stakeholder and time horizon.
Memory anchors
Market Share
Market share is a business's sales divided by total market sales, multiplied by 100.
Market Growth
Market growth is the percentage change in total market size over time.
Price Elasticity of Demand
PED is percentage change in quantity demanded divided by percentage change in price.
Income Elasticity of Demand
YED is percentage change in demand divided by percentage change in consumer income.
Inelastic Demand
Demand is price inelastic when the absolute PED value is less than one.
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
A market's total annual sales are £80m and one firm sells £12m. What is the firm's market share?
Total market volume rises from 500,000 to 575,000 units. What is market growth?
Answer all questions to submit.
Next step personalized recommendations
Continue learning
Move forward only after this module is stable.
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