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21. Which panel in Figure 5-2 shows the effect of a decrease in the price of apples, other things constant?
21. Which panel in Figure 5-2 shows the effect of a decrease in the price of apples, other things constant? 22. Which panel in Figure 5-2 shows the effect of an increase in income, other things constant? 23. Which panel in Figure 5-2 shows the effect of an increase in the price of oranges, other things constant? 24. Which panel in Figure 5-2 shows the combined effects of an increase in the price of oranges and a decrease in the price of apples?