Formula

Price Elasticity in Terms of the Inverse Demand Function

The price elasticity of demand (ε) can be calculated using the inverse demand function, P=f(Q)P = f(Q). The formula is given by ε=f(Q)Qf(Q)ε = -\frac{f(Q)}{Qf'(Q)}, which can also be written as ε=PQf(Q)ε = -\frac{P}{Qf'(Q)}, where f(Q)f'(Q) is the derivative of the inverse demand function. This formulation allows for the calculation of elasticity based on the inverse demand function. For a more detailed explanation of inverse functions and the inverse function rule, see Section 7.4 of 'Mathematics for Economists: An Introductory Textbook' by Malcolm Pemberton and Nicholas Rau (4th ed., 2015 or 5th ed., 2023).

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Updated 2026-05-02

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