[xofer]

I just had a conversation with a friend about this. He was leaving a country where haggling is the norm, and he wanted to buy some gifts in a hurry, on the way to the airport. So, he tried to say: "I don't have time to haggle; this is my offer; take it or leave it." The TL;DR: it didn't work. He paid more than he wanted and wasted more time. What we figured is that, as with salary, the negotiation is important so everyone feels like they won. Your worth to your employer is only half of the equation. The other half is what you require. Neither are simple, and the point of the negotiation is to find an amount that makes you both happy.