Along a straight-line demand curve:

Question

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The slope of a straight-line demand curve is constant because it represents a constant rate of change in quantity demanded for a given change in price. However, the price elasticity of demand, which measures the responsiveness of quantity demanded to a change in price, varies along the curve. At high prices and low quantities, demand is relatively elastic, and at low prices and high quantities, demand is relatively inelastic.

Along a Straight-Line Demand Curve