A business professional at their desk uses a calculator and laptop to analyze the price elasticity of demand.

Price Elasticity of Demand: Know When the Price Is Right

Learn why price elasticity of demand is important, how to calculate and measure it, and what it can do to unlock revenue growth.

By Peter Strohkorb , Founder and CEO, Peter Strohkorb Sales Advisory

October 13, 2026
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Price Elasticity of Demand FAQs

Price elasticity of demand is the overall measure — it tells you how much demand moves when price changes. Inelastic demand is just one result on that scale: it’s when a price change barely moves demand, giving you a PED value less than 1. So elasticity is the yardstick, and “inelastic” is one of the readings it can produce, alongside elastic (greater than 1) and unit elastic (equal to 1). Essentials like medication and gasoline are the classic inelastic examples — people buy about the same amount no matter the price.

The formula is the percent change in quantity demanded divided by the percent change in price. The step-by-step version most businesses use is the midpoint formula (also called arc elasticity), which measures each change against the average of the two prices and quantities so the result stays consistent whether the price rises or falls. A result greater than 1 means demand is elastic, equal to 1 is unit elastic, and less than 1 is inelastic.

Price elasticity is really a measure of consumer behavior rather than a force acting on it — it captures how buyers respond when a price moves. When demand is elastic, even a small increase pushes customers to cut back, delay the purchase, or switch to a cheaper substitute. When it’s inelastic, they keep buying at roughly the same rate because the product is essential or has few alternatives. Factors like income, available substitutes, and whether the item is a necessity all shape which way they’ll lean.

Price elasticity is a useful signal, not a crystal ball. It’s based on historical data, so it can miss sudden shifts — a new competitor, an economic downturn, or a change in customer taste. It also assumes everything else holds steady, which rarely happens in the real world, since price is only one of many things shaping a buying decision. Treat it as one input into your pricing strategy and revisit the numbers as conditions change.

Businesses use price elasticity to set prices that maximize revenue without driving customers away. It guides promotion and discount decisions (worth it when demand is elastic, often not when it’s inelastic), informs product and feature strategy, and sharpens sales forecasts. Pairing elasticity data with sales analytics can also reveal which customer segments are most price-sensitive, so you can tailor offers to each one.