I'd like to propose two very simple rules:
- no business entity can have more than 150 people.
- no individual can take part in more than one business.
You can have as many non-controlling/non-voting shares on any business entity, but you can only contribute directly to one.Put those in place, and you destroy corporatism and with it you destroy the concentration of power. Politically, it's much easier to sell "no one should have this much power" over "no one should be allowed to amass so much money". Left and Right could easily be united on this.