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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.
NO. For a linear demand curve demand is price-elastic when the price is high, price-inelastic when the price is low, and unit elastic when the price is half of what it is when the demand curve intersects the Y-axis.