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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.
The price elasticity of supply measures how the amount of a good that a supplier wishes to supply changes in response to a change in price. In a manner analogous to the price elasticity of demand, it captures the extent of horizontal movement along the supply curve relative to the extent of vertical movement. If the price elasticity of supply is zero the supply of a good supplied is totally inelastic and the quantity supplied is fixed.