Part A generally enjoys the fixed income stipulated in the fund contract and belongs to the stable part. In addition to using part of its own funds, Class B also uses Class A funds, and undertakes the compensation obligation for Class A with its own income and principal. Belongs to the radical or radical part of the fund.

The ratio of Class ab of graded funds is generally one to one (unless otherwise agreed in the fund contract).

When the net value of the fund fluctuates greatly, the fund contract will generally stipulate the terms of split and merger. This will have a great influence on the proportion of part ab. In extreme cases, the leverage ratio of the fund will exceed 10 times, which will cause great risks and need special attention.