At this point, it's difficult to know exactly what the government's "cash for clunkers" program is supposed to accomplish.
Claims about its economic and environmental benefits are increasingly detached from reality, and the chief advantage of the program would seem to be that it "worked," in the sense that it was popular among those looking to buy a car.
To add to Elana's post yesterday on the "myths" circulating about the program, let me offer a few thoughts on how best to think about whether the program has provided actual net benefits.
The first thing to consider is what would have happened in the absence of the program. Vehicle sales rose fairly strongly in July, and this will no doubt be attributed to the "clunkers" rebates.
But during the recession, sales hit historic lows. Replacement rates for vehicles sank to unsustainable levels, suggesting quite a bit of pent up demand in the economy.
With economic recovery and continued improvement in credit markets, sales were sure to begin rising, with or without a government subsidy.
"Cash for clunkers" may have altered the timing of purchases, but in all likelihood most of these buyers were going to be in the market soon anyway.
What about the efficiency savings generated by the program? To generate its 0.5 percent of oil consumption savings estimate, the study Elana cites used the following assumptions:
The projection assumes some 250,000 "clunkers" with an average 15 miles
per gallon efficiency are traded in for vehicles rated at an average 25
mpg, and travel an average 10,000 miles per year.
Given that far less than a 10 mile per gallon improvement is required to get a $3,500 voucher for a car or any voucher on an SUV or truck, it's not clear that this is an appropriate number to use. And even when efficiencies do improve significantly, the increase in mileage can't be solely attributed to the program.
Moreover, most of the clunkers being traded in this summer will have been purchased at a time when oil prices were lower than they are at present. Real oil prices in 2003 were half their current level; those in 1998 were one-fifth of prices now.
So in all likelihood, efficiencies for new vehicle purchases would be, on average, higher than those of trade-ins even without the program.
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