Crude oil prices fell as much as 2 percent on Tuesday on uncertainty over whether global demand will be enough to erode a sky-high surplus, ahead of a weekly survey of U.S. inventory levels.

Volatility has picked up this week, as the outlook for crude has been muddied by data pointing to the market possibly having stabilized after losing more than half its value in a year, and the persistence of the highest global surplus in modern times.

There is evidence that U.S. shale production is starting to feel the pinch of oil prices near six-year lows, which has prompted the International Energy Agency to issue more bullish forecasts for the market balance next year.

Source: http://www.reuters.com/article/2015/09/22/us-markets-oil-idUSKCN0RM00Q20150922
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