Abstract
The concept of elasticity in economics is taught mostly in secondary education. Students generally mix up slope and elasticity even though many textbooks explain the difference between them. This note is to substantiate explanations by Round and McIver (2006) in view of exploring possible reasons how students might have confused elasticity and slope from initial knowledge of elasticity. This note indicates some misunderstandings that arise from elasticity illustrations, and provides possible and alternative ways for understanding elasticity. As indicated by Round and McIver (2006), a precise use of terms in textbooks is necessary to understand the difference between the elasticity and slope of a demand curve in third degree price discrimination, given the assumptions in which the theory has been established in relation to elasticity.
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