Select excerpts are listed below.
"Nearly 95% of all stocks in the 1940s and 1950s were owned by individual investors. They were mostly buy-and-hold investors, just looking to earn some dividends. More than 95% of all trading was done by individual investors. Today that number is more like 2% with 98% of trading being carried out by institutional investors and machines.""The precipitous decline in fees can be traced back to both Vanguard and a change in rules instituted by the SEC back in 1975. That’s when the SEC abolished fixed-rate commissions for stock trading. Before then investors were paying an average of 1-3% to buy or sell a stock. So the costs didn’t scale even if the size of your trades went up. Plus the bid-ask spreads were wide enough to drive a truck through.""During the 1980s, mutual fund assets jumped from $241 billion to $1.5 trillion. The charge was led by money market funds, which soared from $2 billion to $570 billion, accounting for almost half the increase.""We went from 1% stock market ownership in 1929 to 19% in 1983 to nearly 60% by 2000. Almost 60% of households who owned stocks had purchased their first share after 1990. One-third of all buyers entered the market in 1995 or later.""The S&P 500 lost around 10% in total during the first decade of the 21st century, a 10 year stretch that saw the market get chopped in half twice. Things felt pretty bleak coming out of the Great Financial Crisis of 2008."Link
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That leads naturally to the matter of pensions. Agreed that after 1981 pensions shifted from defined benefit (traditional) plans to defined contribution (401(k)) plans. Still, pensions were prominent prior to 1981. Companies must have been investing that pension money somewhere. It was most likely in fixed income, which is why conflating investing in stocks and investing in all securities muddies the narrative.
Of course where companies invested pension money prior to 1974 (ERISA) was ... nowhere. Pensions were not required to be adequately funded. See Studebaker.
This "democratization" of stock trading, however little or much, took time. In 1992, trading a few shares of stock could still cost much more than the purported "bad old days" rate of 1%-3%: https://www.nytimes.com/1992/12/05/news/strategies-buying-stock-ways-to-save-on-brokers-commissions.html
Although wealth inequality was not the focus of the article,
you are correct that the very wealthy own a disproportionate share of stocks.
According to the Federal Reserve, the wealthiest 1% of the population
owned more than 50% of corporate equities and mutual fund shares in Q1 2023.
Link
USA Facts provides more detailed 2019 data regarding stock ownership.
Link
That little kernel of truth behind the myth of democratization changes perceptions. It doesn't require people to have sizeable amounts invested to shift their focus, any amount will do. The ratio of CEO to worker wages has risen from 20x in the 1960s to over 350x in 2000, and is now sitting around 280x.
https://www.epi.org/publication/ceo-compensation-2018/
Download Link https://www.icifactbook.org/xls/23-fb-table-01.xls
since peaking in 2001 (8,268) and 2002 (8,223).
But, do investors really need 7,393 mutual funds to choose from?
The total US market (W5000) has only 3,480 stocks now.
https://assets-global.website-files.com/60f8038183eb84c40e8c14e9/6462aa70ae7c2a11c83779e6_FT_Wilshire5000_IndexSeries_May2023.pdf
(according to several reports) but has fallen precipitously since then.
The decision by many companies to remain private influenced this decline.
It seems kind of crazy there were almost three times as many U.S. mutual funds/ETFs
(12/31/2022) relative to the number of Wilshire 5000 stocks (03/31/2023).