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  • Defining Point Price Elasticity Using the Derivative of the Demand Function

Interpreting Components of the Point Elasticity Formula

When using the formula ε=PQdQdPε = -\frac{P}{Q} \frac{dQ}{dP} to calculate the price elasticity of demand at a specific point, the derivative term, dQdP\frac{dQ}{dP}, is expected to be negative. In your own words, explain the economic principle that accounts for this negative value. Then, explain the role of the negative sign at the front of the formula.

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