Oil at $80 a Barrel Muffles Forecasts for U.S. Shale Boom

``The U.S. benchmark price dropped to $79.78 a barrel on Oct. 16, the lowest since June 2012. At that level, one-third of U.S. shale oil production would be uneconomic, analysts for New York-based Sanford C. Bernstein & Co. led by Bob Brackett said in a report yesterday.''