'Expect some volatility' in oil price as US output flows back, IHS Markit's Yergin says - CNBC
'Expect some volatility' in oil price as US output flows back, IHS Markit's Yergin says CNBCA rise in U.S. shale oil output and lackluster global demand will create volatility for oil markets, according to Dan Yergin, IHS Markit's vice chairman.