pretty much, my first bigco job I made the mistake of only applying to the one place (had a job already, was looking for a change but without any urgency), and they would not budge on salary, just said the offer was already very generous and at the top of their salary band for my level. the next time I was job hunting I had just been laid off and so was frantically applying to a lot of places, ended up getting several offers and that definitely made a difference (though interestingly enough no one was willing to negotiate on base pay, but they would on things like stock and signing bonuses)