To clarify, there was no confusion.
When someone says, "take it or leave it," it's bullying. When someone says, "we're paying you this because this is what everyone else gets and that's fair because I'm telling you it is," that's also bullying.
A negotiated price is a function of the true price at which parties arrive at a deal. How do you deal with liars? Find options that yield information about their intent. This is the real art. It's finding information oracles about their position independent of what they present. Some people are simple, most aren't.
In this sense, negotiation is the pursuit of truth.