Crude oil prices have been on a rollercoaster over the last four trading sessions that has seen some of the highest volatility in a quarter of a century. The market is providing a brutal reminder of the extreme side of commodity pricing, leaving many analysts and traders struggling to identify a safe strategy. Front-month Brent crude futures rose by more than 10 percent on Thursday, 5 percent on Friday and 8 percent on Monday, before plunging by more than 8 percent on Tuesday. To put that in context, the percentage daily price movements were 4.6 standard deviations away from the mean on Thursday, 2.4 standard deviations on Friday, 3.7 on Monday and 3.8 on Tuesday. If price changes followed a normal distribution, a move of 3.5 standard deviations should occur only […]