身边的经济学·社会常识英语30篇（2）
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Public Goods and the Streetlight Funding Puzzle
公共物品与路灯谁来买单
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Streetlights benefit everyone nearby but exclude no one, making them a classic public good.
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Because individuals cannot be charged easily, private firms rarely install them profitably.
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Free-riding occurs when people enjoy light without contributing to its cost.
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Local governments typically fund streetlights through property or sales taxes instead.
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This reflects the broader principle that public goods require collective financing mechanisms.
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Underfunding leads to dark streets, raising safety and economic efficiency concerns.
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Economists use cost-benefit analysis to decide optimal lighting levels per neighborhood.
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Technology like smart sensors may lower maintenance costs but not core funding dilemmas.
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Cross-subsidies between commercial and residential zones often shape actual budget decisions.
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The streetlight case illustrates why markets alone fail to provide certain essential services.