Taxes, Subsidies, and Regulation
Governments can address the market-failure problems externalities and public goods create using several tools: a tax on an activity with a negative externality, like pollution, raises its cost to better reflect the harm it causes, discouraging some of that activity; a subsidy for an activity with a positive externality, like research, lowers its cost to encourage more of it; and direct regulation can require or prohibit certain behavior outright, like a pollution limit, instead of adjusting price at all. None of these tools guarantees a perfect fix: each has its own real costs and practical limits, so choosing among them involves genuine trade-offs, not a simple, automatically correct answer.
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