TEHRAN, Iran - Iran took a step on Friday toward establishing an oil market denominated in euros, a plan analysts described as highly unlikely to materialize but which in theory could have serious consequences for the U.S. economy. Iranian state-run television said the country's oil ministry granted a license for the euro-denominated market, an idea first floated back in 2004, though just who would trade on it remains unclear. If the market were to succeed — or if Iran simply demanded payment for its oil in euros — commodities experts said it could lead central bankers around the world to...