Well, if you've gotten to the point where you don't really give a damn if they offer a job or not, the correct answer is,
"That's relevant only if you're proposing to pay me to do that other job, the one that I used to do.
What we're discussing here and now is what you'll pay me to do the job that _you_ need done.
Since you already budgeted the money for it, just put the highest amount you anticipated in an offer letter, and I'll get back to you."
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If you do give them a number, use the real one. If you were accepting a low salary because your kids were in school, or the climate was nice, etc., so state.
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Okay, I've already tried every possible tactic except flat out lying. My experience says that an outfit you'd want to work for won't screw you over ... and conversely.
My experience also says that the outfits you'd want to work for are rarely hiring.
Mike Halloran
Pembroke Pines, FL, USA