Is there research to back this up? Ie is it really the case that 'non-executive' workers have no negotiating power? Is this true in all sectors or only some? Anecdotally I've seen instances where non-execs successfully negotiated a salary increase, etc.
Not that I'm going to dig out right now. I mentioned 'terms' because I wanted to address things like the contract period and so on, rather than just pay.