No, it usually is a disagreement on how they should work (usually with the conventional way presented as some inviolatable physical law).
But that's irrelevant, as I wasn't aiming to critique labor markers and capitalism in the comment, or say that a "company exists in order to funnel all its profit to its workers".
That whatever they pay will be shaped by supply and demand and acceptable to people in the job market looking for a job is a given, a tautology actually.
Still, how well a company pays depends on how much of its profit it gives away. That whatever it does end paying will be ammenable to "supply and demand" doesn't mean there aren't companies paying well above market value for the same roles as others who pay less - even if the former don't need to do that to get employees.