Suppose that the price of peanut butter rises from$2 to $3 per jar. [LO 4.5]a. The quantity of jelly purchased falls from20 million jars to 15 million jars. What is thecross‐price elasticity of demand betweenpeanut butter and jelly? Are they complementsor substitutes?b. The quantity of jelly purchased rises from15 million jars to 20 million jars. What is thecross‐price elasticity of demand betweenpeanut butter and jelly? Are they complements or substitutes?

Microeconomic Theory
12th Edition
ISBN:9781337517942
Author:NICHOLSON
Publisher:NICHOLSON
Chapter5: Income And Substitution Effects
Section: Chapter Questions
Problem 5.9P
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Suppose that the price of peanut butter rises from
$2 to $3 per jar. [LO 4.5]
a. The quantity of jelly purchased falls from
20 million jars to 15 million jars. What is the
cross‐price elasticity of demand between
peanut butter and jelly? Are they complements
or substitutes?
b. The quantity of jelly purchased rises from
15 million jars to 20 million jars. What is the
cross‐price elasticity of demand between
peanut butter and jelly? Are they complements or substitutes?

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