It’s easy to take for granted the Federal Reserve’s ability to raise interest rates. Even among the legions who doubt that Fed officials will pick the ideal moment to start increasing rates for the first time since 2008, few question the Fed’s technical competence. The central bank has a long history. The engine is known to work. So it may come as a surprise to learn that the old engine is broken. When the Fed decides that it’s time to “lift off” — perhaps this week, but more likely later this year — it will be relying on a new system, assembled from spare parts, to make interest rates rise. There is a general ... (full story)