As Sandi's income rises, her demand for popcorn rises. As Mark's income falls, his demand for prepaid telephone cards rises. What kinds of goods are popcorn and telephone cards for the people who demand each?

Microeconomics
13th Edition
ISBN:9781337617406
Author:Roger A. Arnold
Publisher:Roger A. Arnold
Chapter3: Supply And Demand: Theory
Section3.1: What Is Demand
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As Sandi's income rises, her demand for popcorn rises. As Mark's income falls, his demand for prepaid telephone cards rises. What kinds of goods are popcorn and telephone cards for the people who demand each?
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