He doesn’t address another possibility. That the inherited wealth, as evidenced by DuPont heirs, was carried over from earlier era that lacked the progressive t

He doesn’t address another possibility. That the inherited wealth, as evidenced by DuPont heirs, was carried over from earlier era that lacked the progressive taxation structure of the 50s and 60s that may have prevented accumulation of wealth. That was largely dismantled in the 80’s and 90’.