身边的经济学·社会常识英语30篇（4）
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Why Do Prices Change?
价格为什么会变？
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A bag of rice costs more in winter than in summer.一袋大米冬天比夏天贵。
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Why? Because less rice is ready to harvest then.为什么？因为那时可供收获的大米更少。
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When supply drops but demand stays high, prices rise.供给减少而需求不变时，价格就会上涨。
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If many people want the same phone, its price may jump.如果很多人想要同一款手机，它的价格可能飙升。
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If a shop has too many old toys, it cuts the price.如果商店积压了太多旧玩具，就会降价销售。
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Weather, news, and habits all affect supply and demand.天气、新闻和消费习惯都会影响供需。
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Prices are like signals—they tell us what is scarce or common.价格就像信号——告诉我们什么稀缺、什么常见。
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No one sets them alone. They form from many small choices.没人能单独决定价格，它来自无数微小选择的共同作用。