To put it simply, the fixed investment of a fund is to buy a fund with the same money at a fixed time every month. It is only stipulated to buy 300 yuan or 1000 yuan every month, which can be redeemed at any time. The advantage is that the risk is reduced and the rate of return is not high. I read a message a while ago. The return rate of American equity funds seems to be not much different from its inflation rate. Don't believe the theory of doubling in a few years. Think about the annual rate of return of 6%, it will take 12 years to double, and before 12 years, the most expensive thing to buy food was only a few cents ... it is suitable for people who make less money every month and can't save money, which is a kind of compulsory savings. Long-term persistence is very expensive. When making money, anyone can make a fixed investment every month, but when the market is in a downturn, how many people can persist?