$西方石油(OXY)$ 油價的升跌並不是決定整個投資的關鍵。巴菲特認為：石油行業跟其它行業不同，它的產能無法快速提升。
經歷了2014年-2015年油價大跌後，美國頁巖油企業開始減少資本支出、努力減債、約束供給彈性、穩定利潤確定性、回購或分紅派息回饋股東。而當油企自主實行供給側改革的時候，自由現金流的積累就不在對資本支出有更多的依賴了..
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Ggood chance to get in.. seems like hitting support line, if this hold thru can rebound .