身边的经济学·社会常识英语30篇（8）
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Why Prices Change Without Warning
价格为何毫无预警地变动
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You might notice milk costs more this month—even if nothing changed at your local store.你可能注意到，这个月牛奶价格涨了——即便你家附近的商店什么都没变。
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That’s often because farms faced bad weather, truckers paid higher fuel fees, or global demand rose suddenly.这通常是因为农场遭遇恶劣天气、卡车司机支付了更高的燃油费，或全球需求突然上升。
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When wheat prices jump in Canada or Australia, bread makers everywhere feel the pressure quickly.当加拿大或澳大利亚的小麦价格上涨时，全球各地的面包制造商很快就会感受到压力。
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Supermarkets don’t raise prices just to earn more—they must cover rising costs or risk losing money.超市涨价并非只为赚更多钱——而是必须覆盖不断上涨的成本，否则可能亏本。
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Sometimes a single factory fire can delay toy shipments before Christmas, pushing holiday prices up.有时，一家工厂起火就可能导致圣诞前玩具发货延迟，进而推高节日商品价格。
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Online sellers adjust prices several times a day using software that watches competitors and stock levels.在线卖家利用软件实时监控竞争对手和库存水平，一天内多次调整价格。
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Yet not all price changes are external—some shops lower prices quietly to clear old stock before new models arrive.但并非所有价格变动都源于外部因素——有些商家会悄悄降价，以便在新款上市前清掉旧货。
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Understanding this helps you wait for better deals instead of assuming 'sale' always means real value.了解这一点，能帮你耐心等待更划算的时机，而非一见‘促销’就以为真划算。