Theoretically speaking, there are only two possibilities to increase the return on investment. One possibility is that the reinvestment return of money market funds will increase, and the other possibility is that the fund manager will cash in the floating surplus generated by the investment of money market funds bonds. In the first case, the high rate of return of money market funds can be sustained, but this high rate of return can not be much higher than the previous period (for example, the rate of return can be increased from 4% to 5%, but it is unlikely to last above 6% in a short time); In the second case, the high yield of money market funds is unsustainable. Although the rate of return will be very high at this time (for example, above 8%), after 7 days, the 7-day annualized rate of return of money market funds will return to the original level.

For savvy investors, they will pay more attention to the daily income of 1 10,000 shares while paying attention to the 7-day annualized rate of return, and then multiply the daily income of 1 10,000 shares by 365, which is the actual rate of return of current money market funds.

For professional investors, they will also pay attention to the daily income of 10,000 shares during holidays, because fund managers cannot adjust the income of money market funds during holidays, and the income of 10,000 shares during holidays can reflect the static rate of return of fund portfolios. Since ten thousand returns on Saturday and Sunday are generally published together, dividing ten thousand returns on Saturday and Sunday by two and multiplying by 365 is the most real static rate of return of money market fund portfolio.

In short, for investors, the criteria for choosing money market funds should not only look at the 7-day annualized rate of return, but also look at the stability of daily 1 10,000 returns.