Identify which of the following would generate a decrease in the market demand for e-book readers, which are a normal good Explain your answer and draw a sketch of the market. a. An increase in the price of downloadable apps used to enhance the e-book reading experience, which are complements b. An increase in the number of consumers in the market for e-book readers c. A decrease in the price of tablet devices, which are substitutes d. A reduction in the incomes of consumers of e-book readers