Your employment agreement will list your renumeration in most cases I would think.
I would say the onus is on the prospective employee to ask all the required questions about the job in question including what they pay will be in terms of dollar amount and how it is calculated. (hourly, commission, salary, combination etc)
I can tell you as someone who interviews and hires people often that I don't discuss pay unless the person i'm interviewing brings it up. If they don't care to ask it usually will end up much lower than if they bring it up and defend why they deserve more.
Lastly pay is more than just wage. You should be negotiating benefits as well.