Ben Felix | The Index Fund "Tipping Point" @BenFelixCSI | Uploaded November 2022 | Updated October 2024, 5 hours ago.
Index funds are mainstream. At year end 2021 more of the US stock market was owned by index funds than by actively managed funds. Funds only own about 30% of the US market, but taking a broader view of institutional investors, assets have been shifting toward more passive institutions.

Index investing as a theoretically optimal investment strategy works best in an efficient market, but if everyone turns into a passive index investor the market can’t be efficient. This is commonly known as the Grossman-Stiglitz Paradox, and it has some people raising the alarm about a tipping point for market efficiency.

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