Tumble is a bit of a stretch, imo, but.. What goes up, must go down.
Und vice versa.
Not necessarily, in an inflation. Inflations, when they get steep, produce numerous rapid price rises as people try to outguess the rates. That creates sharp price spikes. The more extreme spikes are followed by sharp drops, usually steeper than the rise. More and more a moving average should be used to see the actual progress of the inflation rise. Most of the excess money created by the FED in the last 6 years (Bush'e "devaluation") has been sucked up by foreign banks trying to keep their dollar reserves from declining in value and have not translated into price increases except in energy and housing. Those stashed dollars are coming back into the market in what the Wall Street gurus are calling a dollar selloff. They will now be competing for goods and services. I have noticed that, at least in my local area, the prices of things I buy every week have been increasing significantly over the last couple of weeks.