I didn't get into this, but Brook argues that allowing people to become billionaires has led to increasing costs of living in major cities, pushing out the kind

I didn't get into this, but Brook argues that allowing people to become billionaires has led to increasing costs of living in major cities, pushing out the kinds of people who start startups in favor of trustafarians, i-bankers, corporate lawyers, and the other kinds of boring people that billionaires breed. He's more focused on stories than economic analysis, but the argument seems plausible.