I don't understand

*start rant

why are gasoline companies allowed to raise the price of gas over $.20 in one day on the fears something might happen? they didn't pay that much for the gas that i am pumping. they might pay more for gas they are buying right then and there but not what i am putting in my tank. i wish the goverment would do something to stop these companies from ripping off everyone in America! seriously. how can you raise prices that much and make a multi billion dollar profit and say nothing is wrong? they are all jerks. i guess this is why i am terible at politics. :)

*end rant