Because there is so much excess capacity in the worlds refineries, because there is a fair range of capabilities in that excess capacity and because if there was not enough refining capacity to handle all the sour crude that is available, the price of sour crude would be selling at a greater discount to sweet crude than the current modest discount.

FORBES: Why I think Saudi Oil Production is now at Capacity

The worlds of film and fashion dominate the 45 strong Vanity Fair list with Oscar nominated British actress Carey Mulligan making the cut, along with Helena Bonham Carter, designer John Galliano, film director Martin Scorsese and Hollywood actors Alec Baldwin and Javier Badem.

BBC: Samantha Cameron in Vanity Fair best-dressed list