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题目材料：
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.
以上解析由 考满分老师提供。
