I, Pigovian

Holman Jenkins nails the Pigovian argument today in the WSJ. If you want to use less oil, charge more, don't give tax credits for alternatives. Charging more raises revenue and cuts consumption. Giving tax credits to a highly regressive tax (the people getting the tax credits are not poor) and encourages consumption. Here's a great excerpt:

Even if you believe saving gasoline is a holy cause, subsidizing electric cars simply is not a substitute for politicians finding the courage to jack up gas prices. Think about it this way: You can double the fuel efficiency of any car by putting a second person in it. You can increase its fuel efficiency to infinity by refraining from frivolous trips.

These are the incentives that flow from a higher gas price. Exactly the opposite incentives flow from mandatory investment in higher-mileage vehicles. You paid a lot for a car that costs very little to operate—so why not operate it? Why bother to car pool? Why not drive across town for a jar of mayonnaise?

Though as eager as any to clamber aboard the electric-vehicle bandwagon, German parts maker Robert Bosch notes with rare honesty that electric cars may end up responsible for more CO2 than their conventional counterparts in regions (like much of the U.S.) where electricity is produced from coal.