Examples: staple groceries (e.g. milk), own-label goods, mass transport (bus/rail)
Examples: cigarettes, demand for council-owned properties, demand for supermarket own-label products
Understanding YED helps businesses plan for different economic conditions. A business that knows whether its products are luxuries, necessities or inferior goods can adapt its strategy accordingly.
Strategic implications:
Luxury businesses should build financial reserves during good times to survive periods of lower demand during recessions.
Businesses selling inferior goods can expect sales to rise during economic downturns but may lose customers during periods of growth.
Diversifying the product range to include both luxury and budget options protects a business against economic fluctuations.
Businesses can use YED data to forecast demand changes when economic indicators suggest incomes are rising or falling.
Real-World Case Studies
Aldi and Lidl — inferior goods gaining ground in a squeeze
Through the UK's cost-of-living pressures of the mid-2020s, discount supermarkets Aldi and Lidl continued taking market share from the traditional "Big Four" (Tesco, Sainsbury's, Asda and Morrisons), a trend that has persisted into 2026 as many households keep prioritising value even as headline inflation has eased. This is a textbook example of negative income elasticity of demand in action at a market level — when real incomes are squeezed, a meaningful share of shoppers trade down to cheaper retailers, and demand for discount groceries rises even though overall consumer spending power hasn't.
Source: verified via search, September 2026 — Kantar and NIQ/Worldpanel UK grocery market share tracking of discounter growth.
Peloton — a premium brand still struggling even as it returns to profit
Peloton, the premium connected-fitness brand, posted its first full-year net profit in fiscal 2026 — but only by cutting costs, not from a demand recovery: paid subscriptions fell to 2.662 million, down 7.6% year-on-year, and the company itself expects revenue to decline again in fiscal 2027. Several things are squeezing demand at once — a return to in-person gyms, past leadership problems and a product recall, and cheaper connected-fitness competitors — but underneath all of that is a simple income-elasticity point: Peloton's hardware and subscriptions are expensive, discretionary purchases, and when household budgets are under any pressure, premium fitness kit is one of the easiest things to cut or delay compared with essential spending.
Source: verified via search, September 2026 — Sporting Goods Intelligence and IndexBox coverage of Peloton's fiscal 2026 results and subscriber numbers.
Quick Quiz
Pick an answer for instant feedback. Your score is just for you — it isn't saved anywhere.
1. A product has a YED of −0.4. What kind of good is it?
2. Income rises by 10% and demand for a product rises by 25%. What is the YED?
3. Which business is most likely to see rising demand during a recession?
4. What's the key difference between PED and YED?
5. A business wants to reduce its risk from economic downturns using YED. What is a sensible strategy?
Score: 0 / 0
Quick Knowledge Check
Short, snappy recall questions — tap to reveal the answer.
What is the formula for YED? (1 mark)
% change in quantity demanded ÷ % change in income.
What is an inferior good? (1 mark)
A good with negative YED — demand falls as income rises.
What is a luxury good? (1 mark)
A good with YED greater than +1 — demand rises more than proportionally as income rises.
Key Term Flashcards
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Income Elasticity of Demand (YED)
Measures the extent to which quantity demanded is affected by a change in real income. YED = % change in quantity demanded ÷ % change in income.
Normal good
A good with positive YED — demand rises as income rises. Includes necessities (YED between 0 and 1) and luxuries (YED above 1).
Inferior good
A good with negative YED — demand falls as income rises, because consumers switch to better alternatives as they can afford them.
Luxury good
A good with YED greater than 1 — as income grows, proportionally more is spent on it than the income rise itself.
Necessity
A normal good with YED between 0 and 1 — demand rises with income, but less than proportionally, since people already buy what they need.
A*/A Stretch
Synoptic link
Connecting to PED (previous lesson): The strongest answers combine PED and YED rather than treating them separately — as slides 17–18 show, a product that is price inelastic but income elastic (like Product B) is a classic signature of a luxury/branded good, while price elastic but income inelastic (Product A) points to a necessity. Being able to read both elasticities together, not just one at a time, is what separates Level 2 analysis from Level 1.
Examiner's eye
Watch your signs. A common mistake is writing "YED of 2" when a product is actually an inferior good with YED of −2 — dropping the minus sign changes the classification completely (from "demand falls as income rises" to "demand rises even faster than income"). Always state whether YED is positive or negative before classifying the good.
Try This With AI
Before using this: AI tools can get facts or mark scheme details wrong, and quality varies by tool. Always check anything factual against your notes or ask your teacher.
Give me a short scenario with a business, an income change, and a demand change. Ask me to calculate the YED, classify the good (normal necessity, luxury, or inferior), and explain one strategic implication for the business. Then mark my working, not just my final classification.