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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.
1 When the price elasticity of demand for a good is unit (or unitary) elastic (E d = 1), the percentage change in quantity is equal to that in price, so a change in price will not affect total revenue.2  When the price elasticity of demand for a good is relatively elastic d. When the price elasticity of demand for a good is relatively elastic d. 2  When the price elasticity of demand for a good is perfectly elastic (E d is â â), any increase in the price, no matter how small, will cause demand for the good to drop to zero. 3  Hence, when the price is raised, the total revenue falls to zero.