FWIW - This is a topic that completely changed my opinion on economic issues. I would have been with your general position 6 years ago until I started digging into this data.
Your example is correct on the trend - both in yearly income and in wealth. There's piles of data and research on this but of course debates on methodology and magnitudes.
Here's a direct link to
Federal Reserve data that goes back to 1989. I think there's much better analysis from academics on this, but you can quickly plug in the numbers here to get a feel.
Wealth Share 1989:
- Top 1% - 20.8%
- 90-99% - 34.5%
- 50-99% - 37.5%
- Bottom 50% - 7.2%
Wealth Share 2020:
- Top 1% -28.3%
- 90-99% - 36.1%
- 50-99% - 30.1%
- Bottom 50% - 5.5%
Total Change in Wealth (not inflation adjusted - just raw $$)
- Top 1% - 8x
- 90-99% -6x
- 50-99% - 4.7x
- Bottom 50% - 4.5x
It hasn't always been like this. The Fed data shows top 1%, but really the problem is more concentrated than that. Here's the wealth share of the top 0.1% over the last century (
source).