The first and best way to say 'no' to anyone is, 'How am I supposed to do that?' Now the other side actually has no idea as to the number of things you've done with them at the same time. You conveyed to them you have a problem.
Negotiation is often described as the art of letting the other side have your way. You have to give the other side a chance to put stuff on the table voluntarily.
Salary negotiations are particularly important because people are testing you as both a co-worker and an ambassador. They really don't want you to be a pushover, and they don't want you to be a jerk.
As a negotiator, you should strive for a reputation of being fair. Your reputation precedes you. Let it precede you in a way that paves success.
'Fair' is, like, this incredibly overused term in negotiations: 'I just want what's fair.' 'What's the fair market price?'
In reality, every single negotiation involves another commodity that's far more important to us, which is time - minutes, hours, our investment in time. So even if you're talking about dollars, the commodity of time is always there because there has to be a discussion about how the commodity of dollars is moved.