Linear Demand Elasticity    At the other end, near QM (the most consumers will want even if the good is free), a change in quantity is a small percentage of the total. However, since price is near zero, a change in price is a large percentage. Therefore, the elasticity will be a small number, meaning that demand is inelastic.

   We'll leave it to you to prove that elasticity is exactly 1 at the midpoint of the demand curve, but it's fairly easy if you recall your algebra.

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