I don't think there's been 3 generations to test this across, since the post-war boom. Sure there's data from before, but society hasn't been "at scale" for ve

I don't think there's been 3 generations to test this across, since the post-war boom. Sure there's data from before, but society hasn't been "at scale" for very long. It sure seems like the recently emerged mega-economies have a few star powers, ever consolidating their hold. Squeezing out other wealthy families isn't helping the total distribution, if that is the case. Companies keep getting bigger and bigger & the ultra rich get ultra-richer. Families could keep falling like flies, but wealth could still be ever more owned by ultra-wealthy.