The increased spread between the two main crude oil benchmarks has prompted a repeat of criticisms about the use of West Texas Intermediate (WTI) and Brent crude as global oil price markers.The spread has hit a record high over the past week, as the price of Brent crude passed $100 per barrel – a peak not seen since September 2008 – while WTI remained around or below$90 per barrel. Traditionally, WTI trades at a premium to Brent but the relationship has reversed before, for examp