What Is Price Elasticity of Demand?
Price elasticity of demand measures how sensitive customers are to price changes. Learn the formula, what it reveals, and how to use it in pricing decisions.
Key Takeaways
- Price elasticity of demand measures the percentage change in quantity demanded resulting from a 1% change in price.
- Elastic products see large demand shifts with small price changes; inelastic products see little change.
- Understanding elasticity helps you determine whether a price increase will grow or shrink total revenue.
What price elasticity measures
Price elasticity of demand quantifies how responsive buyers are to price changes. It is calculated by dividing the percentage change in quantity demanded by the percentage change in price. If you raise prices by 10% and demand drops by 20%, elasticity is negative 2, meaning demand is elastic. If demand drops by only 5%, elasticity is negative 0.5, meaning demand is inelastic. The absolute value indicates the degree of sensitivity.
Elastic vs inelastic demand
When elasticity exceeds 1, demand is elastic: customers are price-sensitive and will buy significantly less if prices rise. Luxury goods, products with many substitutes, and discretionary purchases tend to be elastic. When elasticity is below 1, demand is inelastic: price changes have limited effect on purchase volume. Necessities like fuel, medication, and mobile data in markets with limited competition tend to be inelastic.
Why elasticity matters for pricing
Elasticity directly informs pricing strategy. For inelastic products, raising prices increases total revenue because volume drops less than prices rise. For elastic products, lowering prices can increase total revenue because volume gains more than offset the lower per-unit margin. A mobile money provider in sub-Saharan Africa might find transaction fees are inelastic for small transfers where no alternative exists, but elastic for larger transactions where bank transfers compete.
How to estimate elasticity
The most reliable method is controlled price testing: change prices for a subset of customers or in a specific market and measure the demand response. Historical data analysis using regression can estimate elasticity from past price and volume changes. Survey-based methods like the Van Westendorp price sensitivity meter provide directional estimates. Start with rough estimates and refine them through ongoing experimentation.