The difference between currencies A and B lies in the different reserved shares of accounts. Currency B is an account with a reserved monetary fund share (same sales channel) greater than100000, and currency A is an account with a reserved share less than100000. At present, there are two levels of money funds in the market, and B-level accounts are all large accounts. All fund companies are different, and some are bounded by 5 million. The management fee of class B is lower than that of class A, and the income of class B is generally slightly higher than that of class A..