Shale Still Economical at $60 a Barrel

Nick Butler, a former group vice president at BP Plc, says "it's still economic to do shale at $60 a barrel crude oil." He speaks with Ryan Chilcote and Jonathan Ferro on Bloomberg Television's "The Pulse" as West Texas Intermediate traded near the lowest closing price in three days amid speculation crude stockpiles increased to the highest level since July in the U.S., the world’s biggest oil consumer.