If you think that the stock market is indeed in a downtrend channel, then there must be many short positions in stock index futures, and the Shanghai and Shenzhen 300 Index is the calibration object of stock index futures, then the funds you invest and stock index futures actually have a certain linkage, and the 20th or so is basically the delivery date of stock index futures (the fifth day of the third week of each month). So if your hypothesis holds, I think the end of the month is better than the beginning of the month.

However, as the above-mentioned friends said, fixed investment is a long-term investment, and its income is because when the stock market rises, you can buy fewer copies with certain funds, and when the stock market is in a downturn, you can buy more copies, thus diluting the cost in the long-term fluctuation of the stock market and obtaining the compound interest growth brought by the growth of listed companies. As far as this month is concerned, the index is in a downward channel for the whole month. In this case, if you buy 1 0,000 yuan on the 5th and 20th, there will be more than 200 price differences, but are you sure that next month is also in a downward channel? If the reversal starts after 5th, the number of copies you set for 20th will be reduced.

Therefore, the fixed investment of the fund is an investment method that dilutes the investment cost with the average cost method regardless of the investment time!