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Spec mapping: AQA 7138 Unit 3.1.3 — Marketing Management (refer to the official AQA specification document for exact wording). This lesson develops price elasticity of demand (PED) and income elasticity of demand (IED) at A-Level depth — the formal calculations using Annex 7 formulae 6 and 7, the structural determinants of each, the inflationary-environment pricing problem that is the canonical 15-mark exam shape, and the evaluative judgement an examiner expects when a business is weighing two pricing options under cost-shock pressure.
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Definition: Price elasticity of demand measures the responsiveness of the quantity demanded to a change in price. It tells the business how sensitive its customers are to price moves and is the most analytically important pricing tool in marketing.
Price elasticity of demand (PED) = % change in quantity demanded ÷ % change in price (Annex 7 formula 6 — provided in the exam formula sheet)
PED is almost always negative because price and quantity demanded move inversely (the law of demand). By convention in A-Level Business, PED is usually quoted as a positive number (the absolute value), but candidates should know that the underlying number is negative.
| |PED| | Classification | Meaning | Pricing implication | |--------|----------------|---------|---------------------| | > 1 | Elastic | Demand responds more than proportionately to price | Price cut lifts total revenue; price rise compresses total revenue | | = 1 | Unit elastic | Demand responds proportionately to price | Total revenue is unchanged by price moves | | < 1 | Inelastic | Demand responds less than proportionately to price | Price rise lifts total revenue; price cut compresses total revenue | | = 0 | Perfectly inelastic | Demand does not respond at all | Any price can be charged (very rare — e.g. insulin without substitutes) |
A cinema raises ticket prices from £10.00 to £12.00. Weekly attendances fall from 5,000 to 4,200.
The inelastic reading predicts that total revenue rises — and it does: old revenue £50,000 → new revenue £50,400. The £400 uplift is the diagnostic gain a PED-disciplined pricing strategy seeks. But the analytical work doesn't stop at total revenue — the cinema has lost 800 admissions per week, with consequential impacts on concession revenue (popcorn, drinks), customer-relationship value, and longer-term brand loyalty erosion. PED gives the immediate-revenue answer; serious evaluation asks the second-order questions.
| Factor | Direction | Mechanism |
|---|---|---|
| Availability of substitutes | More substitutes → more elastic | Customers switch easily when alternatives exist |
| Necessity vs luxury | Necessities → inelastic; luxuries → elastic | Necessities are hard to forgo; luxuries are postponable |
| Proportion of income | Higher proportion → more elastic | Big-ticket items get more price-comparison scrutiny |
| Time horizon | Longer horizon → more elastic | More time for customers to find substitutes, switch habits |
| Brand loyalty | Stronger loyalty → more inelastic | Loyal customers absorb price rises before defecting |
| Habit / addiction | Stronger habit → more inelastic | Cigarettes, caffeine, social-media-platform stickiness |
| Breadth of category definition | Narrower definition → more elastic | "Heinz beans" more elastic than "tinned beans" as a category |
Definition: Income elasticity of demand measures the responsiveness of quantity demanded to a change in consumer income. It separates normal goods (demand rises with income) from inferior goods (demand falls with income), and within normal goods separates necessities from luxuries.
Income elasticity of demand (IED) = % change in quantity demanded ÷ % change in income (Annex 7 formula 7 — provided in the exam formula sheet)
| IED | Classification | Type of good | Examples |
|---|---|---|---|
| > +1 | Income elastic (luxury) | Superior / luxury normal good | Fine dining, designer fashion, premium travel |
| 0 < IED < +1 | Income inelastic (necessity) | Necessity normal good | Bread, toothpaste, utilities |
| < 0 | Negative | Inferior good | Value supermarket lines, bus travel, instant noodles |
Real consumer disposable income rises by 5 %. Sales of organic ready-meals rise by 9 %. Sales of value-range tinned soup fall by 3 %.
The strategic implication: in a rising-real-income environment, the organic-ready-meal range will see structural demand tailwind while the value-range tinned-soup volume will erode; in a recession, the polarity flips. Cross-cycle planning requires both PED and IED estimates, not one or the other.
flowchart TD
Shock["External shock<br/>(cost inflation, income squeeze)"] --> Choice{"Pricing<br/>decision?"}
Choice -->|"Raise prices"| PED1["PED applies:<br/>inelastic = revenue up,<br/>elastic = revenue down"]
Choice -->|"Hold prices"| Margin["Margin compression:<br/>contribution per unit falls"]
Choice -->|"Cut prices"| PED2["PED applies:<br/>elastic = volume up,<br/>inelastic = revenue down"]
PED1 --> Strat["Strategic positioning impact:<br/>price vs share trade-off"]
PED2 --> Strat
Margin --> Strat
Strat --> IED["IED also applies:<br/>luxury vs necessity vs inferior"]
IED --> Brand["Brand-equity and<br/>stakeholder-fairness check"]
Brand --> Outcome["Final pricing decision"]
style Choice fill:#a16207,color:#fff
style Outcome fill:#15803d,color:#fff
The diagram makes the analytical point that pricing decisions cannot be reduced to a single PED calculation. PED gives the immediate-revenue arithmetic, IED gives the cross-cycle context, margin discipline supplies the cost-side floor, and brand-equity / stakeholder fairness checks the long-term reputational impact. Each lens is necessary; none is sufficient alone.
Aldermoor Beverages is a UK premium tonic-water brand, founded in 2018, with revenue of £14 million in 2025 and operating profit margin of 11 %. Its core product is a £2.20 single-serve premium tonic positioned against Fever-Tree and Schweppes 1783. The brand holds approximately 3 % of the UK premium-tonic market by value. Aldermoor sells through 4,000 independent off-trade stockists, 6,200 on-trade venues (bars and restaurants), and a direct-to-consumer subscription channel. Following an inflationary cost-shock — botanical raw materials up 22 %, glass-bottle costs up 14 %, and a 9 % rise in distribution costs — Aldermoor's contribution per unit has compressed from 78 p to 51 p. The marketing director must recommend a 2026 pricing strategy and is weighing two options. Option A: an 18 % price rise from £2.20 to £2.60 per single-serve unit, holding range structure unchanged. Internal modelling estimates PED at ~−0.7 for the core premium-tonic segment (loyal premium buyers absorb price rises, mass-premium buyers are more price-sensitive). Option B: hold the £2.20 price, absorb the margin compression and seek to lift volume by 18 % through expanded distribution and a 12 % marketing-spend uplift, targeting a market-share rise from 3 % to 4 %. Consumer real-income forecasts for 2026 are flat-to-slightly-negative, with IED for premium tonic estimated at approximately +1.3 (a moderate luxury).
Figures fabricated for illustrative purposes; not affiliated with any actual business.
Evaluate the two options and recommend the more appropriate pricing strategy for Aldermoor Beverages in 2026. (15 marks)
| AO | What the question rewards | Mark weighting on this 15-mark item |
|---|---|---|
| AO1 | Knowledge of PED, IED, contribution per unit, market share | ~3 marks |
| AO2 | Application to Aldermoor's specific context — premium-tonic positioning, the cost-shock numbers, the channel mix, the flat-real-income forecast | ~3 marks |
| AO3 | Analytical chain-of-reasoning — recalculating revenue and contribution under each option, comparing the strategic profiles | ~5 marks |
| AO4 | Evaluative judgement — weighing the two options against Aldermoor's strategic context to issue a recommendation; visible deployment of ≥2 Annex 8 sophisticated concepts | ~4 marks |
15-mark Evaluate items reward a structured "set up the framework / work each option / weigh the trade-offs / issue a defended recommendation" build. Pure listing is penalised heavily; sustained chain-of-reasoning leading to a defended conclusion is rewarded. The 7138 spec is explicit that Top-band credit requires accurate use of sophisticated concepts from Annex 8.
Aldermoor Beverages is facing a contribution-compression shock — contribution per unit has fallen from 78 p to 51 p, a 35 % squeeze that threatens the firm's 11 % operating profit margin. Doing nothing is not an option because the margin compression would erode operating profit substantially even at current volume.
Option A is to raise prices by 18 %, from £2.20 to £2.60. With PED estimated at −0.7, a 18 % price rise would reduce quantity demanded by 12.6 % (18 % × 0.7). The contribution per unit would rise by 40 p (the full price increase) to 91 p, well above the original 78 p. So per-unit economics improve significantly even after the volume loss. However, the 12.6 % volume loss risks losing distribution slots in independent off-trade stockists and on-trade venues, where competitors like Fever-Tree may grab the shelf space Aldermoor vacates.
Option B is to hold the £2.20 price and lift volume by 18 % through expanded distribution and a 12 % marketing-spend uplift. The contribution per unit stays at 51 p, but volume is 18 % higher, so total contribution rises. Market share also rises from 3 % to 4 %, strengthening Aldermoor's negotiating position with wholesalers and on-trade buyers. The risk is that the 12 % marketing-spend uplift may not deliver the 18 % volume uplift, especially in a flat-real-income environment where the premium-tonic segment with IED of +1.3 is vulnerable.
On balance, Option A looks stronger because the contribution recovery is mechanical and certain — the PED arithmetic gives a defensible base figure. Option B's volume uplift is forecast, not guaranteed. Aldermoor should pursue Option A and accept the volume loss in exchange for restored unit economics.
Examiner-style commentary: To reach Stronger and Top-band, the response needs (i) explicit deployment of multiple Annex 8 sophisticated concepts by name — price elasticity, income elasticity, market share, risk vs uncertainty; (ii) a sharper conditional conclusion that surfaces what would change the recommendation; (iii) deeper AO3 work on the interaction between PED and IED in a flat-real-income environment. The analytical chains are sound but the sophisticated-concept deployment is implicit rather than explicit. The on-balance judgement is correct but under-defended.
Aldermoor Beverages faces a contribution-compression shock from a cumulative cost-shock — contribution per unit has fallen from 78 p to 51 p, a 35 % per-unit squeeze. At Aldermoor's 2025 revenue base of £14 million, total contribution at the new cost structure is meaningfully below 2025 levels at constant volume, threatening the 11 % operating profit margin. Doing nothing is not a viable strategic option.
Option A — an 18 % price rise to £2.60 — would, given the estimated PED of −0.7, reduce quantity demanded by ~12.6 %. The new contribution per unit would be 51 p plus the 40 p price uplift = 91 p, a 16.7 % improvement on the original 78 p. The arithmetic of the new total contribution: at constant 2025 volume, the contribution gain per unit (40 p) outweighs the volume loss (12.6 % of units lost at 91 p each), so total contribution rises. The capital-light nature of Option A is its principal strength — no marketing-spend uplift, immediate per-unit margin recovery, and price-signalling that reinforces the premium positioning. The principal weakness is the market share (Annex 8 financial concept #c14) consequence: 12.6 % volume loss at 3 % current market share may push Aldermoor below 2.7 %, weakening on-trade and off-trade distribution negotiations, where shelf-space allocation depends partly on share velocity.
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