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Convenience foods' popularity surged in the United States after the Second World War. Canned goods had been available for over a century, but now other convenience foods began filling supermarkets. Frozen foods had had to wait until the postwar prosperity when refrigerators with freezers became common. Other newly introduced or improved products included cake mixes, dehydrated potatoes, and instant rice, all of which saved consumers work in exchange for somewhat higher prices. Consumers overwhelmingly embraced this trade-off. During this era, economists noted that, contrary to long-established economic theory, as Americans' salaries increased, the percentage of income they spent on food increased rather than decreased. While inflation was a problem during this time, the higher cost of processed foods was the main factor in soaking up discretionary income.

It can be inferred from the passage that before the Second World War, economists making predictions about the postwar period on the basis of established economic theory would have expected which of the following?

A.The percentage of income spent by most consumers on convenience foods would offset increases in their salaries.
B.Consumers' incomes would increase, but the portion of their discretionary income spent on food would increase more.
C.Consumers whose incomes increased would spend a smaller percentage of their incomes on food than they had in the past.
D.Salary increases would significantly alter consumer' s willingness to pay higher prices for convenience when they shopped for food.
E.The cost of convenience foods would increase more rapidly than the cost of other food items.

C显示答案

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