In the details, even though the simulation shows great inequality, it also shows that everyone gets a chance to be part of the 1% for a bit.

Which is better: everyone is always mediocre, or everyone gets to be super rich for a bit and poor for awhile?

I also created a sum positive version of his sim awhile back, and one interesting outcome is that monopolies became essential for stabilizing the economy in the face of catastrophic recessions. And if we had the zero sum economy where everyone is mediocre, then no one survives catastrophic recessions.

So, capitalism and monopolies seem to be the best overall in terms of survival benefit, and wealth redistribution schemes get wiped out by natural selection. I guess that's what happened to the USSR during the Cold War.