Define price elasticity of demand and the formula.

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Define price elasticity of demand and the formula.

Price elasticity of demand shows how much quantity demanded responds to a price change, expressed as the percentage change in quantity demanded divided by the percentage change in price. In formula form, E_d = (%ΔQ_d)/(%ΔP). If price moves by a certain percent and quantity demanded changes by a larger or smaller percent, elasticity captures that responsiveness (the sign is usually negative because demand and price move in opposite directions, so we often report the absolute value to compare magnitudes). The standard way to compute it uses the percentage changes in quantity and price; flipping those changes, using a simple price-to-quantity ratio, or adding the changes would not reflect how sensitive demand is to price.

Price elasticity of demand shows how much quantity demanded responds to a price change, expressed as the percentage change in quantity demanded divided by the percentage change in price. In formula form, E_d = (%ΔQ_d)/(%ΔP). If price moves by a certain percent and quantity demanded changes by a larger or smaller percent, elasticity captures that responsiveness (the sign is usually negative because demand and price move in opposite directions, so we often report the absolute value to compare magnitudes). The standard way to compute it uses the percentage changes in quantity and price; flipping those changes, using a simple price-to-quantity ratio, or adding the changes would not reflect how sensitive demand is to price.

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