Inequality is not static, it is rather dynamic.
Nassim Taleb makes some good points about that here[2], for instance, ~ 70% of Americans will spend a year in the top 20% and only ten percent of the wealthiest five hundred American people or dynasties were so thirty years ago.
[1] https://www.nasdaq.com/articles/generational-wealth%3A-why-d...
[2] https://medium.com/incerto/inequality-and-skin-in-the-game-d...