1.  externalities
2.  externality

• 1. 外部性: externality | externalities | Exterior | pecuniary externalities
• 2. 外部性理论: externality | Externality Theory
• 3. 网络外部性: network externality | network externalities | Network outside | cross-group network externali-ties

更多释义

• 1.普雷蒂教授和他的同事计算了某一年英国农业的外部性。
  Professor Pretty and his colleagues calculated the externalities of British agriculture for one particular year.
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• 2.燃烧燃料产生这些“负外部性”的事实并不意味着燃油税不会太高。
  The fact that burning fuel creates these "negative externalities" does not imply that no tax on fuel could ever be too high.
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• 3.从经济学的角度来看，为了应对负外部性，原则上应该征收的税收是准确的：对一升燃料征收的税应该等于使用一升燃料所造成的危害。
  Economics is precise about the tax that should, in principle, be levied to deal with negative externalities: the tax on a liter of fuel should be equal to the harm caused by using a liter of fuel.
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