身边的经济学·社会常识英语30篇（2）

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公共物品与路灯谁来买单

Streetlights benefit everyone nearby but exclude no one, making them a classic public good.
Because individuals cannot be charged easily, private firms rarely install them profitably.
Free-riding occurs when people enjoy light without contributing to its cost.
Local governments typically fund streetlights through property or sales taxes instead.
This reflects the broader principle that public goods require collective financing mechanisms.
Underfunding leads to dark streets, raising safety and economic efficiency concerns.
Economists use cost-benefit analysis to decide optimal lighting levels per neighborhood.
Technology like smart sensors may lower maintenance costs but not core funding dilemmas.
Cross-subsidies between commercial and residential zones often shape actual budget decisions.
The streetlight case illustrates why markets alone fail to provide certain essential services.