Two monkeys were paid unequal wages...an old video from the TED series.

[LT Barclay]

1. I remember this study and my co-workers over the years have hated me for it, because my conclusion is that people aren't

as smart as monkeys.
My other abrasive, pithy observation is that if the first caveman that said he wanted to be king should have been beaten in the head with a rock by the others around him. This process should have continued through history until that desire was out of our gene pool.
Finally, there is a documentary called "Stress, a Portrait of a Killer" by NatGeo. In the documentary, they measure stress hormones of baboons of different "rank" and lower "rank" have shorter life spans and worse health due to stress and the same occurs in humans. But one tribe of baboons, all the adult males were killed and the stress levels of the entire group went down. So going forward the females wouldn't allow the males to have that control.
END THE OLIGARCHY. Tax or exile the wealthy.