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.
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Why? Because less rice is ready to harvest then.
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When supply drops but demand stays high, prices rise.
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If many people want the same phone, its price may jump.
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If a shop has too many old toys, it cuts the price.
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Weather, news, and habits all affect supply and demand.
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Prices are like signals—they tell us what is scarce or common.
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No one sets them alone. They form from many small choices.