身边的经济学·社会常识英语30篇（9）
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Why Prices Change Without Anyone ‘Deciding’
价格为何无人下令却悄然变动
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No one sits in a room and sets the price of bananas or train tickets.没人坐在房间里决定香蕉或火车票的价格。
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Instead, prices rise or fall based on how many people want something versus how much is available.价格涨跌取决于需求与供给的对比。
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If a heatwave ruins banana crops, fewer bananas reach stores, so prices climb.若热浪摧毁香蕉作物，运抵商店的香蕉减少，价格便会上涨。
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When a new app makes ride-sharing cheaper, taxi fares often drop to stay competitive.当一款新应用让拼车更便宜时，出租车 fares 常为保持竞争力而下调。
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Sellers watch what others charge and adjust quickly to avoid empty seats or unsold stock.卖家紧盯同行定价，迅速调整以避免空座或库存积压。
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Buyers also respond—when prices go up, many look for alternatives or wait.买家也会响应——价格上涨时，许多人会寻找替代品或观望等待。
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This constant push-and-pull between buyers and sellers keeps markets moving.买卖双方持续的博弈推动市场运转。
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It’s not perfect, but it usually balances supply and demand without central control.这并非完美机制，但通常无需中央调控即可实现供需平衡。