The market is full of people trying to anticipate how other people are going to react and exploit that by getting there first. There's a layer aimed at forecasting what that layer is going to do as well.
It's guesswork all the way down.
Personally, I try to predict how others are going to predict that yet others will react.
Keynesian beauty contest.
A bunch of "Greater Fool" motivation too.
https://en.wikipedia.org/wiki/Greater_fool_theory