Hearsay on Oil

I was speaking to an economics professor in shul this shabbes and he told me something interesting. Oil, for some stange reason, resists causal regressions. He claimed (and it is more likely that I am getting it wrong than he was incorrect) that despite economists attempts to pinpoint unique variables which correlate to the price of oil, they can't.

Maybe that's why no one has any good ideas about how to bring the price of oil down.