The Wall
Street Journal reports that automakers are asking the EPA to repeal
automobile fuel economy standards, known as Corporate Average Fleet Economy
(CAFE) standards, which are set to rise to 56 miles per gallon by 2025.
Repealing the standards would be a good idea, provided they were replaced by
tax designed to achieve an equivalent saving in fuel. A carbon tax would do the
job nicely, but an increase in the existing tax on motor fuels would also work.
What, exactly, is
wrong with the CAFE standards? The fundamental problem is that they attack the third-party
effects, or negative externalities,
of motor fuel use, such as pollution, highway congestion, and accidents, only
partially and indirectly. As a result, the cost of achieving a given reduction
in fuel use via CAFE standards is higher than it would be if the same result
were achieved more directly through a carbon tax or an increase in the federal
gasoline tax.








