Most of us if we're honest with ourselves are on the level of Strata 1–4. (Even to presume we're Stratum 4 is being generous.)
Strata 5–8 are the rarefied elites. They're typically CEOs of large companies and business leaders.
Stratum 9 and higher—like Mr. Dalio—are the rare geniuses who are capable of thinking into the far future (100+ years) and working on problems of extraordinary complexity.