Price elasticity of demand measures how sensitive consumers are to a change in price. Specifically, it tells you the percentage change in quantity demanded that results from a one percent change in price. If you raise prices by 10% and sales drop by 20%, your price elasticity is -2.0. If you raise prices by 10% and sales barely budge, your elasticity is close to zero.
The formula itself is simple: Price Elasticity of Demand (PED) = % Change in Quantity Demanded / % Change in Price. But the strategic implications of that number are anything but simple. I'd argue that understanding your product's price elasticity is the single most valuable piece of information a marketer can have, because it answers the question that sits underneath every pricing decision you'll ever make: what happens to demand when we change the price?
I think most marketers have an intuitive sense of elasticity without knowing the term. You know that raising prices on a commodity product will send customers running to a competitor. You know that Apple can charge $1,599 for an iPhone Pro Max and barely lose a customer. What price elasticity does is put a number on that intuition, and numbers are what get budgets approved and strategies funded.
When |PED| is greater than 1, demand is elastic, meaning consumers are highly sensitive to price changes. A small price increase leads to a proportionally larger decrease in quantity demanded. Products in competitive markets with many substitutes tend to be elastic. Think generic groceries, budget airlines, or fast fashion.
When |PED| is less than 1, demand is inelastic, meaning consumers are relatively insensitive to price changes. Even a significant price hike doesn't push many buyers away. Gasoline, prescription medications, and prestige-priced luxury goods often fall into this category.
When |PED| equals exactly 1, demand is unit elastic, meaning the percentage change in quantity demanded exactly matches the percentage change in price. Revenue stays constant regardless of which direction prices move. This is mostly a theoretical benchmark, but it's useful as a mental model.
| Elasticity Type | |PED| Value | Price Increase Effect | Revenue Impact | Example Products | | --- | --- | --- | --- | --- | | Perfectly Inelastic | 0 | No change in demand | Revenue increases | Insulin, EpiPens | | Inelastic | 0 to 1 | Small demand decrease | Revenue increases | Gasoline, cigarettes, Apple products | | Unit Elastic | 1 | Proportional demand decrease | Revenue unchanged | Theoretical benchmark | | Elastic | Greater than 1 | Large demand decrease | Revenue decreases | Generic groceries, budget airlines | | Perfectly Elastic | Infinity | Demand drops to zero | Revenue drops to zero | Perfect commodity markets |
Here's the part that trips people up: the goal of marketing isn't always to lower prices. If your product has inelastic demand, raising prices actually increases total revenue. That's counterintuitive until you internalize the math. If you sell 1,000 units at $100 (revenue: $100,000) and raise prices to $120 while only losing 50 units, your new revenue is $114,000. You made more money by charging more and selling less.
Price elasticity isn't fixed. It shifts based on market conditions, consumer psychology, and your marketing strategy. Understanding what drives elasticity is where the real strategic value lives.
This is the single biggest factor. The more substitutes available, the more elastic demand becomes. When Coca-Cola raises its price, consumers can easily switch to Pepsi, store-brand cola, or any other beverage. But when there's only one drug that treats a specific condition, demand is almost perfectly inelastic.
As a marketer, this is why brand equity matters so much. A strong brand reduces substitutability in the consumer's mind, even when objective alternatives exist. Nobody rationally needs a $7 Starbucks latte when $2 coffee exists. But Starbucks has built enough perceived differentiation that many consumers don't treat Dunkin' or McDonald's coffee as real substitutes. That's brand equity converting elastic demand into inelastic demand.
Products that consume a tiny fraction of a buyer's income tend to be inelastic. You don't comparison-shop for salt or paper clips. Products that represent a major expenditure (cars, homes, enterprise software) face more elastic demand because buyers have stronger incentives to negotiate, compare, and wait for better prices.
Demand is generally more elastic in the long run than the short run. When gas prices spike, people keep driving in the short term because they have no alternative. Over months and years, they buy more fuel-efficient cars, move closer to work, or switch to public transit. The St. Louis Fed's 2024 analysis confirmed this pattern across multiple commodity categories.