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Relationship between Demand Curve Slope and Price Elasticity of Demand

The slope of the demand curve is mathematically linked to the price elasticity of demand (ε\varepsilon). This relationship can be expressed by the formula: slope=PεQ\text{slope} = -\frac{P}{\varepsilon Q}. This equation shows how the rate at which a firm must lower its price to sell more units (the slope) is determined by the price, quantity, and consumer responsiveness (elasticity) at that point on the demand curve.

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Updated 2026-05-02

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