From the point of view of cost, it is more cost-effective to buy money funds, because money funds have no fees and bond funds have fees. From the perspective of income, it is more cost-effective to buy bond funds, because the expected income of bond funds is higher than that of money funds, but the probability of loss of bond funds is greater than that of money funds.

Money funds invest in money market instruments, such as deposits, certificates of deposit, short-term bonds and central bank bills. The money fund is the least risky fund, with almost no loss. Bond funds mainly invest in bonds, and the bond investment ratio is not less than 80% of the fund's assets. The risk of bond funds is greater than that of money funds.