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Constant Elasticity Demand Curves. The elasticity of demand is the same at every point along a constant elasticity demand curve. Panel a of the figure shows five constant elasticity demand curves. A perfectly inelastic demand curve, where e = 0 everywhere, is a vertical straight line. The next most vertical demand curve in the figure is also inelastic, with a demand elasticity of -1/3 everywhere.
Price Elasticity of Demand. An important aspect of a product's demand curve is how much the quantity demanded changes when the price changes. The economic measure of this response is the price elasticity of demand. Price elasticity of demand is calculated by dividing the proportionate change in quantity demanded by the proportionate change in price. Proportionate (or percentage) changes are used so that the elasticity is a unit-less value and does not depend on the types of measures used (e.g. kilograms, pounds, etc).