Yesterday, Crude Oil listed in New York, reached the minimum of the last two years (Prices fell below 80 USD a barrel). The supply / demand ratio has been destabilized by increased production in the US and the decline in demand for crude because of the slowdown in many economies. For the oil sector, the fall of oil prices to below 80 USD affect the profitability but also the sustainability. According to some analysts, shale oil production price lies for some oil companies between 70 USD and 80 USD a barrel, so if crude continues down these companies will start to make losses. The additional problem is that the shale oil industry has been one of the biggest job creators in the US in recent years.
It seems a price war may be coming to oil producers. It does appear possible that Saudi Arabia would start a price war with U.S. shale.
LCrude Weekly chart: