The probability of making money by investing in index funds, for us ordinary investors, there is a 90% probability of making money by lengthening the investment time period. Although it can't be said that 100% makes money, there are also some funds whose fundamentals have changed in the current index fixed investment funds. If we are unlucky, or because the recognition is not high, we buy these funds whose fundamentals are not so good, then even if our fixed investment time period is longer, the probability of making money is relatively small, and we can only continue to lose money.