Looking back to the 80s, oil bottoms tend to take a couple of months (this is a monthly chart). And the confirmation that it's a bottom is a break above the 10 month moving avg. The recent bottom failed to break above the 10 month ma at $41. The oil market is a two-tier market - most of the production is cheap OPEC oil with a cost basis in the $10s, and the marginal producers are much higher, in the $50s+. So the marginal supply is at $50 . . . or at $15, if the marginal supply is coming from Iran or Libya.