身边的经济学·社会常识英语精读30篇（4）
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When Markets Fail—And Why Governments Sometimes Step In
市场失灵之时：政府为何有时必须介入
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Markets excel at matching buyers and sellers—but they often ignore harm done to people who aren’t part of the transaction.
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A factory dumping waste into a river lowers its costs, but downstream communities pay with polluted water and higher medical bills.
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This mismatch—private gain versus public cost—is called a negative externality, and it’s why regulation exists.
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Similarly, vaccines create positive externalities: your shot protects others, yet the market underprovides them without incentives.
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Pure competition assumes full information, but few consumers compare insurance plans by reading 80-page policy documents.
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When one company dominates broadband access in a region, prices rise and service quality drops—not because of inefficiency, but lack of choice.
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Pension systems rely on trust across generations; left entirely to markets, many would save too little or invest too riskily.
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During pandemics, uncoordinated private responses lead to mask shortages, testing bottlenecks, and unequal vaccine distribution.
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Government intervention isn’t about rejecting markets—it’s about correcting conditions where they systematically misallocate resources.
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Well-designed rules don’t replace entrepreneurship; they define fair boundaries so innovation serves society, not just shareholders.
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The goal isn’t perfection—it’s preventing outcomes where the invisible hand accidentally pushes people off the cliff.
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Smart policy asks not ‘should government act?’ but ‘what problem does this solve—and what new friction might it create?’