the big story with US wealth is the growth in wealth/GDP ratio and the growing share of that wealth held by the top 1%. The share of wealth going to the top 1% shows occasional setbacks, like when the stock market fell in 2001 or in the aftermath of the Great Recession, but overall, the share of wealth going to this group has risen from about 24% of the total back in 1990 to above 30% of the total more recently.
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Note that the ratio of wealth to GDP can be decomposed as the ratio of earnings of assets to GDP times the price/earnings ratio for assets. My impression, and I could check this, is that earnings of real estate have gone up a lot as a share of GDP, but corporate profits as a share of GDP have not gone up as fast. Instead, what has powered the stock market has been an increase in the price/earnings ratio, and/or the ratio of profits of firms on the stock exchange to profits of small businesses has gone up considerably.
As to “shares” of wealth, I bet that if you look at the actual households that were in the top 1 percent in 1990, their share of wealth did not go up over the past 30 years. What went up was an arithmetic measure of the share of the wealth in 2020 held by the top 1 percent of households as of 2020 relative to the share of the wealth in 1990 held by the top 1 percent of households as of 1990.
My guess is that the amount of churn at the top of the wealth distribution is higher than it was thirty years ago, although that is something that one could check. You could compare the turnover in a magazine’s list of the richest people from say, 1985-1990 to the turnover from 2015-2020.