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First, I'm not sure Krugman is right about gas prices not going down. Economics 101 is what they teach undergrads, but it's a myth, like every 101 course. It only works in a vacuum. In real life, there are other factors affecting pricing. If supply is held steady, the basic graphs you learn in beginners economics shows that demand adjusts with price. Prices go down, therefore demand goes up, and that drives prices back up. That's part of what Krugman is talking about. But he's also assuming that gas prices are developed based on what people will pay, and it's not that simple. Nor is it instantaneous. We've all seen that people will pay anything they have to for gas, so the limits on price are not based on demand--which is almost steady--nor on supply--which the oil companies hold steady. Price is based on formulae involving cost, profit, need, and a number of factors involving the oil company. In other words, the oil companies want to make a certain profit, so they adjust prices to do so.
But their price must be limited by consumer ability to pay, otherwise the amount sold will decline, and that will cut into oil company profits, as well.
So the supply is fixed, the demand is fairly steady as long as consumers can afford it, and the profits the oil companies are expecting is fixed. In that scenario, cutting out some taxes for a short time might drive prices down, for a short time. Eventually with steady supply and demand, prices will rise again, but remember, the price of gas--a necessity that you must purchase--is not completely based on supply and demand, so the realignment of the prices won't be instantaneous. It might even be a little slower than expected, because oil companies will get a boost in profit because more gas will be sold (remember, ad valorum sales taxes on gas don't cut into their profits directly, since the money goes straight from consumer to government).
In short, gas prices might dip for a month or two, especially with Clinton's plan.
The part you misrepresent is the difference between Clinton and McCain. McCain's tax cut goes to the oil company, but Clinton's plan proposes taxing the oil companies the amount of the increased profit, thus reclaiming the lost tax revenue if it goes straight to the oil companies. Thus, bridges and roads don't suffer, and at worst everything breaks even. At best, pump prices dip for a while. And since the oil company is not going to make extra profit off the tax cut, they will have no incentive to raise prices, and even an incentive to let the lower prices ride, as more product is sold. In other words, with McCain's plan they have an incentive to raise prices to make up the difference of the tax cut, but with Clinton's they have an incentive to keep prices at the lower level.
As Krugman says, Clinton's plan isn't evil, just pointless. But that's worst case. Best case, it might work.
Clinton's smarter than she's being given credit for.
Now, there are still two serious problems that could occur. First, since the oil companies are limiting supply for the summer, increased purchasing may run those supplies out sooner, driving prices up even higher when it does. That's when Gore's plan for selling a quick surge of oil from the fed reserve might work. Second, it would only work once, since oil companies would then manipulate the system by raising prices later to make the same thing happen again.
So, not a perfect plan, but it's got more going than people are giving it credit for. Having said all that, I don't like it much. I'd rather see some form of tax rebate or subsidy (same thing) targeted to income--a progressive rather than regressive tax, in other words. Gas taxes are regressive. But there is no other plan, and I'm getting tired of our "Cows smiling at a passing train" system of government. Somebody needs to do SOMETHING!!
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