Just to be clear, the OP is talking about net worth (assets minus debt), not income.

For income levels (US only), see here:

https://www.crappie.com/crappie/off-...8-upper-class/


As a side note, we are very fortunate to live in the USA:


Despite progress in reducing extreme poverty, nearly half the world's population lives on less than $5.50 a day, with a rising share of the poor in wealthier economies, the World Bank said Wednesday....

... And poverty is becoming entrenched in Sub-Saharan Africa, where 84.5 percent of the population still live on less than $5.50 a day, the report said.

Nearly half the world lives on less than $5.50 a day: World Bank