Crude Oil Prices Waver as Investors Weigh OPEC Curb Against. U.S. Shale Output December 14, 2017 by adminOil prices showed mixed trade on Thursday after two-straight sessions of declines as market participants continued to weigh the battle between the Organization of the Petroleum Exporting Countries’ (OPEC) attempts to curb global supply while U.S. shale producers continued to ramp up output. www.mcxgoldstar.com7830278303