Change in purchasing power of money over time. Practically imperceptible in real time to the naked eye. The higher the rate, the sooner you'll notice the change.
My mom used to use the fishing song from The Black Bass to put me to sleep. Many moons later, I still find it soothing.
https://youtu.be/6DDffBpWfnk?t=03m15s
The media trying to rage bait the entire time was embarrassing.