Here it is right from the horse's mouth. There is not enough oil to feed capitalist appetite:
"I have made the case that the high price of oil injures economies. But I think we better understand that there's not a lot of excess capacity in this world right now," Bush told a press conference late last month.
"Hopefully high prices will spur more exploration to bring excess capacity on, but demand is rising faster than supply. And that's why you're seeing global energy prices rise."
Bush prepares to press Saudis on skyrocketing price of oil - Yahoo! News