身边的经济学·社会常识英语30篇（2）
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Budget Constraint and Choosing What to Buy
预算约束线与消费组合选择
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With $50 a week for food and transport, you can’t buy unlimited takeout *and* subway passes *and* fresh fruit.
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Every choice has a trade-off: one more coffee means one less snack—or skipping lunch twice.
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Prices set the slope of your budget line—when bus fare rises, your food options shrink unless income grows.
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Students often redraw this line weekly: 'Can I afford both Netflix *and* textbooks this month?'
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Sales and coupons shift the line outward temporarily—but real flexibility comes from steady income or lower fixed costs.
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Seeing choices as points along a line—not isolated yes/no decisions—builds clearer spending habits.
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Apps that track spending help visualize where you sit on that line each day.
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Parents teaching teens often use allowance + chores to model this trade-off early.
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It’s not about restriction—it’s about mapping what matters *most* within real limits.
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Freedom lies in conscious trade-offs—not endless options.