There are several possibilities for the money fund to have a very high income one day. One is that after the long holiday, the post-holiday income will be distributed together on the first trading day after the holiday, and the income will rise sharply on the day of arrival. Another situation is that when funds are tight at the end of the quarter, the surge in assets held by the money fund on the same day will also lead to a surge in 10,000 returns on that day.

Money fund is an open-end fund that gathers idle social funds, is operated by fund managers and kept by fund custodians, and specializes in investing in risk-free money market instruments. It has the characteristics of stable income, high security, high liquidity and "quasi-savings".