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For the following pairs of goods, would you expect the cross-price elasticity of demand to be positive, negative, or zero? Briefly explain

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For the following pairs of goods, would you expect the cross-price elasticity of demand to be positive, negative, or zero? Briefly explain.

A. electricity and air conditioners

B. solar power and coal power

C. airplane tickets and train tickets

D. paper clips and bicycles

E. cell phones data plans and smartphones