Although we could describe both the cross-price elasticity of demand between paper coffee cups and plastic coffee

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Although we could describe both the cross-price elasticity of demand between paper coffee cups and plastic coffee lids and the cross-price elasticity of demand between sugar and artificial sweeteners as highly elastic, the first cross-price elasticity is negative and the second is positive. What is the reason for this?
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Microeconomics

ISBN: 978-1259163531

1st edition

Authors: Dean Karlan, Jonathan Morduch

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