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Elasticity of demand is constant and equal to 1 at every point on the demand curve. The shape of such a demand curve would be :

Solution

Correct Option: 4

A demand curve with constant unitary elasticity at every point takes the shape of a rectangular hyperbola. Along it, total expenditure (P×QP \times Q) remains constant because any price change is exactly offset by an equal proportional change in quantity demanded.

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