Here's a quote from Bankrate.com:
"The Energy Policy Act of 2005, which established a new tax credit system to reward purchasers of IRS-approved hybrids, also mandated a reduction of the tax benefit. The credit amount is cut once a car maker sells its 60,000th hybrid."
So, in an effort to encourage people to buy gas saving hybrids, this part of our "energy policy" provides a tax incentive until the car gets really popular, at which point the incentive expires. Let's guess - do sales continue at the same rate after the incentive expires as before? Who votes for these people? [I know, we do

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