- In the Above Figure, the Shift in the Demand Curve

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In the above figure, the shift in the demand curve from D to D1 can be the result of

A) an increase in the number of teenagers, all of whom demand more pizza than do other age groups.
B) an increase in the price of soda, a complement to pizza.
C) new technology that increases the profit from producing pizza.
D) a decrease in income if pizza is a normal good.
E) a decrease in the price of a sub sandwich, a substitute for pizza.