As I write this something like 95% of our refineries along the Texas gulf area are shut down, or roughly 20% of our nation's capacity. That means prices have to rise, and it's not anybody's greedy fault. Here's why.
First, the demand at the current price will not change at all (in fact, it may even have risen as hundreds of thousands of people rushed to evacuate) even though the supply is suddenly cut short by 20%. Prices have to rise to reduce demand to the level of the supply, and yes, even something as "inelastic" as gas demand can be influenced by raising the price. Just look at how much demand dropped earlier this summer when oil (and subsequently, gas) hit record levels - the number of miles driven by Americans actually dropped significantly, something that almost never happens.
When prices suddenly rise to factor in shorter supply, the supply that is left will go farther. Some people who would have filled up under the old price will only get enough gallons to last a few days under the new price. This lets the supply of gas last for more people, whereas under the old price gas would have run out sooner and some people would have no way of getting much-needed gas, even if they had enough money to buy gas at either price.
Secondly, the transportation of oil and gas has to be adjusted, and the costs of this extra transportation make the gas cost more. If any still-running refineries have extra capacity, they will take on some of the oil from the shut-down refineries, and it costs money to transport them. More importantly, some of the remaining supply of gas has to be transported farther to get to all the stations that normally rely on the gas refined from the shut-down refineries. If prices aren't raised, they won't be able to afford to transport the gas these extra miles, and the stations will not be able to get more supplies of gas.
President Bush has promised that they will be on the look-out for "price-gouging," but they're unlikely to find any. The reason prices temporarily rise is to ensure that more people who need gas will be able to get it. There's no point in forcing prices down for something if you can't get it anywhere.
