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    The worst thing that can happen is that you lose money. The best thing is that you make money. How much either of those will be cannot be known. Commented Jul 21, 2021 at 16:27
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    @SeverusSnape If you put $100 in, and the fund loses half its value, you've lost $50 of your principal. (Probably a little bit more from fees, too.) It's possible for your principal to go to zero, but index funds protect you quite a bit from that; for all the stocks in the fund to go to zero, you'd be looking at a global economic armageddon.
    – ceejayoz
    Commented Jul 21, 2021 at 17:27
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    The worst thing that can happen is that you discover the fund managers were fraudulent, and none of your money was invested in anything at all. See en.wikipedia.org/wiki/Bernie_Madoff for example.
    – alephzero
    Commented Jul 22, 2021 at 8:15
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    @alephzero Note that Bernie Madoff's company was not a mutual fund. He was a broker-dealer, managing money for individual investors. Mutual funds are much more heavily regulated, somewhat like the difference between privately-held and publically-traded corporation.
    – Barmar
    Commented Jul 22, 2021 at 14:12
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    @ceejayoz Indeed, if a major index lost all it's value I think losing your investments would be the least of your worries. Commented Jul 22, 2021 at 14:55