Large companies have pretty standardized salaries (it's one way to fight biases that could result in lawsuits). They also tend to view employees as more fungible, so you'll be less likely to point at skills that make you uniquely qualified for a particular position. Even so, pushing back could give you a 5% salary increase.
absolutely but even in a government or semi-state where the salaries are very very standardised you are still allowed to ask and often it will work.
Some people seem to assume that they're not allowed to ask just because there's a structure.
A munchkin is someone who follows the letter of the rules of a game while breaking their spirit, someone who wins by exploiting possibilities that others don't see, reject as impossible or unsporting, or just don't believe can possibly work.
If you have done something that everyone around you thought would not work, something that people around you didn't do after they saw it work, please share your experiences. If you tried something and failed or have ideas you want to hear critique of, likewise please share those with us.