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.
几个因素将决定转向生物燃料的经济学，包括经济规模和在交通中使用乙醇的国家政策。
Several factors will determine the economics of moving to biofuels, including economies of scale and national policies for using ethanol in transport.
几个因素将决定转向生物燃料的经济学，包括经济规模和在交通中使用乙醇的国家政策。
Several factors will determine the economics of moving to biofuels, including economies of scale and national policies for using ethanol in transport.
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