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Actually median (and poorer) households did well between 2019 - 2022. See https://www.federalreserve.gov/publications/files/scf23.pdf or the related blog post https://www.noahpinion.blog/p/great-news-about-american-weal... . This chart doesn't seem to be about households alone.

Those at the bottom did well due to government "one time" contributions, not because the economic system miraculously raised them.

Yep, probably true, but the government redistributing income is in itself kind of part of our economic system.