Price elasticity of demand

Price elasticity of demand (PED) measures how responsive the quantity demanded of a good is to a change in its price (1); it is calculated as the percentage change in quantity demanded divided by the percentage change in price (1).

Price-inelastic demand means quantity demanded is unresponsive to price — the % change in quantity is smaller than the % change in price (Knowledge 1). Because LuxeBrand is a strong luxury brand with loyal, high-income customers and few close substitutes, those customers keep buying even if the price rises (Application 2). So a price rise causes only a small fall in sales, and since the price gain outweighs the small volume loss, LuxeBrand's total revenue rises (Analysis 1).

Factor 1 — many close substitutes. The more numerous and similar the substitutes, the more elastic demand is (Knowledge). BudgetBite operates in a competitive area with many rival fast-food outlets selling similar meals (Application), so if it raises prices customers easily switch to a cheaper rival, causing a large fall in sales (Analysis).

Factor 2 — meals are a discretionary, price-sensitive purchase. Fast food is a non-essential, budget purchase for BudgetBite's cost-conscious customers (Knowledge + Application). Because these customers watch their spending closely, even a small price rise noticeably reduces how often they buy, making demand very responsive to price (Analysis).

Because PureWater's demand is inelastic (−0.4), raising price is, on the face of it, an effective way to increase revenue: quantity falls by less than price rises, so a 10% price rise cuts unit sales only about 4% and total revenue rises. Inelastic demand gives PureWater genuine pricing power, and lifting the shelf price is far cheaper to implement than ramping up bottling-line throughput and expanding its distribution network to sell more volume.

However, whether it is a good strategy depends on several things. The PED of −0.4 may not hold at higher prices — push price too far and customers may start switching to tap water or rival brands, so demand becomes more elastic and the revenue gain evaporates. A price rise could also damage PureWater's brand and customer goodwill, and may attract new bottlers into the market now that it looks more profitable, eroding future sales. There is also the risk of regulatory or reputational backlash if bottled water is seen as an essential being over-priced.

So raising price is likely to increase revenue in the short run given inelastic demand, but its wisdom depends on how far the rise goes, how customers and rivals react, and the effect on PureWater's brand — a modest rise exploits the inelasticity safely, whereas an aggressive one risks pushing customers away and inviting new entrants into the bottling market.

JetAway faces price-elastic demand, so PED is central to any fares decision — but whether changing price is the best route to higher revenue depends on the direction, and on alternatives.

Using price the right way. With elastic demand, cutting fares is the way to raise revenue: a fare cut causes a more than proportionate rise in bookings, so total revenue rises and seat load factors improve — well-suited to a budget carrier whose passengers are price-sensitive and whose per-flight operating costs are largely fixed once a rotation is scheduled. Raising fares would do the opposite and cut revenue, so a naïve fare rise would be the wrong move. Used correctly (fare cuts, or dynamic yield-management pricing that lifts fares only on inelastic peak-departure slots), price is a powerful revenue lever.

But price is not the only lever, and cutting it has risks. A fare cut lowers yield (revenue per seat) and only raises total revenue if the incremental bookings actually fill otherwise-empty seats — useless if the aircraft is already at high load factor; it can also trigger a fare war with rival budget carriers, eroding everyone's margins. JetAway could instead raise revenue through ancillary sales (checked baggage, seat selection, onboard catering), opening new routes, tighter load-factor and aircraft-utilisation management, or marketing to shift demand right — some of which lift revenue without sacrificing fare yield.

Judgement. On balance, changing price can be the best way to raise JetAway's revenue, but only if it cuts fares (given elastic demand) or uses selective/dynamic yield pricing on inelastic routes — a blanket fare rise would reduce revenue. Even then, price is best combined with ancillary revenue and load-factor management, which lift revenue without a fare war. The best approach therefore depends on JetAway's cost base and rivals' likely response: where a fare cut fills empty seats profitably it is powerful, but where load factors are already high or rivals will match, non-price revenue streams are the safer route.

Price elasticity of demand tells TasteCo how unit sales — and total revenue — will respond to a price change, so it is a valuable pricing tool. But it has real limitations, and pricing decisions rest on more than PED alone.

Why PED is useful. First, it lets TasteCo predict the revenue effect of a price change: for an inelastic product (a branded staple SKU with few substitutes) it can raise price to raise revenue, while for an elastic product (a value line with many rivals) it should hold or cut price. Second, it helps TasteCo price its product range coherently — charging more where demand is inelastic and competing on price where it is elastic, maximising revenue across its SKUs. Third, it links to strategy: knowing that branding makes demand more inelastic, TasteCo can invest in marketing to gain pricing power. Applied across the portfolio, PED directly protects and grows revenue.

Limitations. However, PED is hard to use precisely. Estimating it is difficult: real PED figures come from past sales data that may not predict future behaviour, and PED is not constant — it changes with the price level, over time, and as rivals act. It also ignores competitor reactions: a price cut that theory says will raise revenue may simply trigger a matching cut and a price war. PED says nothing about costs — a revenue-maximising price is not necessarily a profit-maximising one — so TasteCo must also weigh its unit production cost, ingredient/input prices and factory overheads, and whether longer batch runs deliver economies of scale. And pricing is shaped by other objectives (market share, brand image, penetration or skimming strategies) that PED cannot capture.

Evaluation. How useful PED is depends on how it is used. It is most valuable as a guide to the direction of a pricing change and for segmenting a product range by elasticity, especially when combined with unit-cost data and knowledge of rivals. It is least valuable if treated as a precise, fixed number or used in isolation from costs, competition and strategy. Its usefulness also depends on data quality: good sales analytics make PED actionable, poor estimates make it misleading.

Conclusion. On balance, PED is highly useful but not sufficient for TasteCo's pricing. It provides an essential framework for judging how price changes affect revenue and for pricing a diverse range of SKUs sensibly, so TasteCo should use it routinely — but alongside unit-cost information, competitor analysis and its wider objectives, and with awareness that estimates are imperfect and elasticity shifts. Used as one input among several rather than a precise rule, PED meaningfully improves TasteCo's pricing; used blindly, it can mislead.