Why do economists pay little attention to the algebraic sign of the elasticity of demand for a

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Why do economists pay little attention to the algebraic sign of the elasticity of demand for a good with respect to its own price, yet pay careful attention to the algebraic sign of the elasticity of demand for a good with respect to another good's price?
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Principles of Economics

ISBN: 978-0073511405

5th edition

Authors: Robert Frank, Ben Bernanke

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