You're assuming you're negotiating well, but what if more info just raises the floor for everyone? How do you even know you're negotiating well, if you don't kn

You're assuming you're negotiating well, but what if more info just raises the floor for everyone? How do you even know you're negotiating well, if you don't know the baseline? I'm curious if most people just think they're above average in competency, and also think they're above average in pay.