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Public Goods and the Streetlight Funding Puzzle
公共物品与路灯谁来买单
精读先不看文字，完整听一遍。
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Streetlights benefit everyone nearby but exclude no one, making them a classic public good.路灯惠及周边所有人，且无法排除任何人使用，是典型的公共物品。
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Because individuals cannot be charged easily, private firms rarely install them profitably.由于难以向个人收费，私营企业很少能盈利地安装路灯。
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Free-riding occurs when people enjoy light without contributing to its cost.免费搭车指人们享受路灯照明却不分担成本。
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Local governments typically fund streetlights through property or sales taxes instead.地方政府通常通过房产税或销售税为路灯筹资。
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This reflects the broader principle that public goods require collective financing mechanisms.这体现了公共物品需依靠集体融资机制的普遍原则。
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Underfunding leads to dark streets, raising safety and economic efficiency concerns.资金不足会导致街道昏暗，引发安全与经济效率问题。
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Economists use cost-benefit analysis to decide optimal lighting levels per neighborhood.经济学家运用成本效益分析来确定各社区的最佳照明水平。
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Technology like smart sensors may lower maintenance costs but not core funding dilemmas.智能传感器等技术可降低维护成本，但无法解决核心融资难题。
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Cross-subsidies between commercial and residential zones often shape actual budget decisions.商业区与住宅区之间的交叉补贴常影响实际预算决策。
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The streetlight case illustrates why markets alone fail to provide certain essential services.路灯案例说明市场单独无法提供某些必要服务。
精读 · 大约 10 分钟
听 → 读 → 学表达 → 懂 → 今天会说这一句 → 跟读录音 → 自己说一句。
③ 学 · 重点表达
- Free-riding occurs when people enjoy light without contributing to its cost. 免费搭车指人们享受路灯照明却不分担成本。
- Local governments typically fund streetlights through property or sales taxes instead. 地方政府通常通过房产税或销售税为路灯筹资。
- Underfunding leads to dark streets, raising safety and economic efficiency concerns. 资金不足会导致街道昏暗，引发安全与经济效率问题。
④ 懂 · 选一选
⑤ 今天会说这一句
Free-riding occurs when people enjoy light without contributing to its cost.
⑥ 跟读并录音
Free-riding occurs when people enjoy light without contributing to its cost.
第一版：录下来、回听、再听标准音。系统打分以后再加。
⑦ 说 · 自己来一句
用今天的表达，自己说一句。
例子：Free-riding occurs when people enjoy light without contributing to its cost.
已记下。连续天数以后会显示在课表里。
陈老师指导
课程开发中，敬请期待。成人和孩子都可以先自学听读、精读。
这边的讲解音轨还在做。想先跟着老师走完固定 30 课，可以去陈老师带读社（和自学通行不是同一份会员）。
课程开发中，敬请期待。