Even better, negotiate collectively. It's easy to lay off one person but you cannot lay off a whole branch (or all employees ideally).
I know I'm dreaming but there are decades if not centuries of experiences of worker struggles about better salaries or working condition. And well, there are just basics, to be learnt about. If you are on a one-by-one negotiating with your boss in private, then you are in an environment where you've already lost.
It's no surprise that in all other industries salaries working conditions are negotiated (and fought for) collectively.