Required for education: Unskilled labor "must" pay less to motivate people to get diplomas.
Required for productivity: Wages "must" be low enough so that people have to keep working.
Since motivation to get a diploma depends on the size of the income advantage "ideally" people without diplomas should barely be able to sustain themselves - forever.
All other economic talk seems filler material. All excessive wealth "should" go towards sustaining the filler material or otherwise be destroyed. For this purpose we also see endless investment in businesses that exist only for the purpose of extracting wealth from everyone else. Some of course deliver useful products in return but if they could increase ROI by not making anything most if not all would do it. If they operate at a loss it is even more "beneficial" to the system. For this purpose we also have 32 Trillion "hidden" in tax havens.
The whole thing seems to have "evolved" so that we all are as productive as possible only to sacrifice the produce on the altar of productivity again. The bad thing about this is that all this "productivity" destroys everything around us. It all costs finite resources. We would be better off just making what we need efficiently.