The Federal Reserve finds itself in a tricky spot with inflation just a notch above its target of 2%. This poses a challenge for the central bank as they enter what's known as the "last mile" of monetary policy. Today, we explain why the final stretch of the Fed's race to 2% inflation is considered the hardest. *For sponsor-free episodes of The Indicator from Planet Money, subscribe to Planet Money+ via Apple Podcasts or at *plus.npr.org.)**Learn more about sponsor message choices: podcastchoices.com/adchoices)NPR Privacy Policy)