Gasoline prices go up very easily and are hard to bring down. Gas stations do not make a lot of money by selling gas. They make their money by selling pop, snacks, and lottery tickets. The gas is to get the customer into the store. Thus, a gas station that has run out of gas is a station that isn't going to get people into the door to buy the stuff that makes them money. That is why when the station across the street raises their price, this gas station must likewise do so or else the increased demand will cause them to run out.