Elasticity - The Economic Concept of The Economic Concept Behind How Companies Price Products - WSJ Price Index
Summary
Price elasticity of demand measures how responsive the quantity demanded of a good or service is to a change in its price. It is a fundamental concept in microeconomics that determines pricing strategy, tax policy, and revenue optimization.
Definition
Elasticity is calculated as:
Price Elasticity of Demand = % Change in Quantity Demanded / % Change in Price
- Elastic Demand (|E| > 1) — Consumers are highly responsive to price changes. A small price increase leads to a large drop in quantity demanded.
- Inelastic Demand (|E| < 1) — Consumers are unresponsive to price changes. Price increases have little effect on quantity demanded.
- Unit Elastic (|E| = 1) — Total revenue remains constant as price changes.
Determinants of Elasticity
- Availability of Substitutes — More substitutes = more elastic demand.
- Necessity vs. Luxury — Necessities tend to be inelastic; luxuries tend to be elastic.
- Proportion of Income — Goods that consume a larger share of income tend to be more elastic.
- Time Horizon — Demand is more elastic over longer time periods as consumers adjust their behavior.
Backlinks
- Gross Profit — Understanding elasticity is essential for pricing decisions that maximize gross profit: elastic products require competitive pricing, while inelastic products can sustain higher margins.