Price Elasticity of Demand - Answer Pricing Questions with Confidence
When Netflix cut several India plan prices in 2021, it was not simply “discounting to grow.” It was making a sharper bet: in a price-sensitive market, the extra subscribers and viewing could outweigh the lower price per user.
- Price elasticity of demand measures how much quantity demanded changes when price changes.
- Formula: PED = % change in quantity demanded / % change in price.
- If absolute PED is greater than 1, demand is elastic - quantity reacts strongly to price.
- If absolute PED is less than 1, demand is inelastic - quantity reacts weakly to price.
- For elastic demand, a price cut can increase revenue; for inelastic demand, a price increase can increase revenue.
- The best pricing answer checks revenue, contribution margin, competitors, customer segment and brand impact.
- The biggest trap: saying “lower price increases sales” without checking whether profit actually improves.
Big Picture
Price elasticity is the bridge between a pricing decision and customer behaviour. A manager changes price; customers respond; volume changes; revenue and profit move - sometimes in opposite directions.
Core Explanation
Price elasticity of demand answers one practical question: “If we change price by 1%, how much will quantity demanded change?” Because price and quantity usually move in opposite directions, PED is often negative. In interviews, use the absolute value to discuss strength.
The formula is:
PED = % change in quantity demanded / % change in price
The Revenue Rule You Must Remember
Elasticity becomes useful when you connect it to revenue. Revenue is Price x Quantity. So a price cut helps only if the percentage increase in quantity is large enough to compensate for the lower price.
Worked Example: Price Hike for a D2C Brand
Suppose a D2C skincare brand sells a serum at ₹100 and sells 10,000 units a month. Variable cost is ₹60 per unit. The brand raises price to ₹110 and volume falls to 9,200 units.
Interview lesson: the price hike worked not because volume increased, but because demand was inelastic and contribution per unit rose enough to offset lost volume.
What Makes Demand Elastic or Inelastic?
Elasticity is not a property of the product alone. It depends on the customer, context, competition and time horizon.
Key Measures to Track
A pricing decision should not stop at PED. Track elasticity along with revenue, margin and competitive response.
Definitions
Price elasticity of demand is the percentage change in quantity demanded divided by the percentage change in price.
Cross-price elasticity measures how demand for one product changes when another product's price changes. Income elasticity measures how demand changes when consumer income changes.
Case Study - Netflix India and the Price Sensitivity Bet
Netflix reduced India plan prices in 2021 to improve affordability and test whether lower prices could expand adoption in a highly competitive streaming market.
Situation: India had massive video consumption, but paid streaming was intensely competitive. Consumers had alternatives across YouTube, TV, telecom bundles, regional OTT apps and lower-priced plans from rivals. That meant demand for a premium streaming subscription was likely more elastic than in richer, less price-sensitive markets.
The move: Netflix cut prices across its India plans in December 2021. The mobile-only plan moved from ₹199 to ₹149, while the basic plan moved from ₹499 to ₹199. The strategic logic was not “cheap wins.” The primary driver was affordability-led adoption. Supporting drivers included a mobile-first viewing habit, local content investment, intense OTT competition and the need to reduce the perceived gap versus bundled or ad-supported alternatives.
Outcome or lesson: The case teaches that elasticity is not just a formula. Netflix was managing a segmented demand curve - lowering the entry barrier for price-sensitive users while still offering higher-tier plans. The move made sense because the pricing change was supported by product tiering, local content and mobile-first usage, not by discounting alone.
How AI Changes Price Elasticity of Demand
AI is making elasticity less of a one-time spreadsheet estimate and more of a live pricing capability.
Load a company's price page, annual report excerpts and competitor prices into NotebookLM or ChatGPT. Ask: “Identify which products are likely elastic or inelastic, list evidence, and suggest three interview questions on pricing risk.” Then verify every claim manually before using it.
Interview Relevance
“A food delivery platform is considering increasing delivery fees by 10%. How would you evaluate whether this is a good decision?”
Use this sentence to sound sharp: “I would not call demand elastic for the whole platform; I would estimate elasticity by segment because a loyal high-frequency user and a casual discount-seeker will react very differently.”
Common Mistake
The costly mistake is treating elasticity as “price cut equals more revenue.” It ignores contribution margin, customer segment and competitor reaction. One-line fix: always say, “I will check whether the volume lift is enough to improve contribution, not just sales.”
What to Revise Next
Now that elasticity is clear, revise the pricing moves built on top of it: Discounting, Promotions & the Risk of a Price War, followed by Modern Models: Subscription, Freemium & Dynamic Pricing. Elasticity tells you how customers react; these topics show how managers use that reaction without destroying margins or brand trust.