Money market mutual fund (MMMF) is also called money market mutual fund. Because the United States has the highest limit on the interest rate paid by time deposits, when the market interest rate rises, the limit on the interest rate of time deposits makes deposits less favorable than investing in other securities, thus affecting the source of funds for banks. In order to avoid this restriction, the "money market mutual fund" was established in the early 1970s. This fund absorbs a small amount of investment, and then it is used to invest in the money market, such as investment certificates of deposit and treasury bills. The investment in this fund ranges from $500 to $65,438+$0,000 per unit. Because it is an investment fund rather than a deposit, what you get from the fund is profit, not interest, and naturally it is not limited by the deposit interest rate. At the same time, the account owner is allowed to issue checks with an amount of not less than $500.