Here are two opposite articles on WSJ published on the same day. The first one, accuses the FED’s policy for bringing into a difficult position Brazil and the rest of the world, and even accuses the U.S. for mindlessness and purposeful action to damage the other countries. The second one, explains that buying medium to long-term Treasuries is a valid monetary policy of the FED in order to stimulate the economy. The first one is written by a journalist. The second one by Alan Blinder, economics professor at Princeton. Who speaks logic is your call. Just read them.