Investors can choose to vote every Thursday. Historically, the probability of falling on Thursday is greater than the probability of rising, but Thursday's fixed investment will make investors' costs lower. The lower the cost, the less risk investors take and the greater the probability of earning in the future. However, the fixed investment of the fund can be carried out at any time without timing.

The average income is obtained from the fixed investment of the fund. The higher the deduction frequency of fixed investment, the more average the cost, the smaller the income gap, and the longer the fixed investment time, the smaller the income gap.