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Elasticity as Relative Slopes: A Graphical Approach to Linking the Concepts of Elasticity and Slope

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  • Xudong Chen

Abstract

Price elasticity and the slope of a demand or supply curve are closely related concepts that address the relationship between a price change and the resulting quantity change. At times, however, the link between these two concepts can appear to be counterintuitive, presenting potential pedagogical challenge. We propose a graphical approach by expressing the elasticity as relative slopes, and perform a comprehensive examination of how price elasticity varies along a demand or supply curve, both in linear and nonlinear cases. We suggest that this less well-known technique provides a viable alternative to facilitate better understanding of the seemingly elusive link between elasticity and slope.

Suggested Citation

  • Xudong Chen, 2017. "Elasticity as Relative Slopes: A Graphical Approach to Linking the Concepts of Elasticity and Slope," The American Economist, Sage Publications, vol. 62(2), pages 258-267, October.
  • Handle: RePEc:sae:amerec:v:62:y:2017:i:2:p:258-267
    DOI: 10.1177/0569434516682713
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    More about this item

    Keywords

    price elasticity of demand and supply; slope; relative slopes; demand curve; supply curve;
    All these keywords.

    JEL classification:

    • A22 - General Economics and Teaching - - Economic Education and Teaching of Economics - - - Undergraduate
    • D11 - Microeconomics - - Household Behavior - - - Consumer Economics: Theory

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