But the eye opener is this. This is the change in the size of each economic group between 1979 and 2014 as a percent of the total population:
- Rich: 0.1% -> 1.8%
- Upper Middle Class: 12.9% -> 29.4%
- Middle Class: 38.8% -> 32%
- Lower Middle Class: 23.9% -> 17.1%
- Poor or Near-Poor: 24.3% -> 19.8%
Statistics like this are certainly subject to biased interpretation and 'massaging'. If one is curious about the source, wiki has a section on the political stance of the Urban Institute [2]. Though the paper itself is very transparent in their methodology and extremely readable. I found it all eye opening to the point that it actually changed my worldview.
[1] - https://www.urban.org/research/publication/growing-size-and-...
[2] - https://en.wikipedia.org/wiki/Urban_Institute#Political_stan...