Money fund is a kind of investment, which produces different investment income every day, just like stock fund, not interest.

Of course, the income of money funds is different from that of stock funds. Its income is low, and it fluctuates greatly according to the operation of the fund manager on the same day, so the 7-day annualized income is generally used to iron out the fluctuation. That is to say, the income of the last 7 days is averaged and then multiplied by 365 as a reference for the income of 1 year, which is comparable to some extent.

At present, most of the online money funds increase their fund shares on the same day, that is, you see that the share held has increased. Some old funds convert shares once a month. Before that, you didn't see the increase in share, but accumulated in the background.