Related to the Economics in Practice on p.55: The Amazon Kindle and the electronic textbooks available for the Kindle are complementary goods.Electronic textbooks and traditional,hard copy textbooks are substitute products.If the price of traditional,hard copy textbooks increases,

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An increase in the price of traditional, hard copy textbooks will cause consumers to look for substitutes, such as electronic textbooks. This will lead to a decrease in the quantity demanded of traditional, hard copy textbooks and an increase in the demand for electronic textbooks. Since the Amazon Kindle is a platform for electronic textbooks, it too will experience an increase in demand. However, the question is asking about the effect on the demand for complementary and substitute goods, not the increase in demand for the Kindle.

Related to the Economics in Practice on P