You have an interesting thesis here but I think there are some logical consequences you aren’t considering. Prior to COVID the US personal savings rate was under 10%, lower than that of countries like China and India, both of which are materially poorer than the US on a per-capita basis. Relatedly, Americans also have extremely high levels of consumer debt.

When you consider just how low US individual income tax rates are by global standards, it’s obvious that disparities in net worth have a lot to do with the fact that a large share of Americans, regardless of their income, effectively choose to live from paycheck to paycheck on the brink of personal insolvency.