Today's net income * holding share-yesterday's net income * holding share = this price difference is the daily income. The principal invested is not shares.

Simple calculation method of income: use some fund shares * net value, and then compare it with the money invested. If it is a cash dividend, count the money already spent.

Investment funds are not bank savings and can never be measured by the concept of interest. Investment funds are risky and may suffer loss of principal. The reason why fixed investment does not care about the short-term ups and downs of the market is because the purpose of fixed investment is to obtain the long-term average rate of return of the whole market with small, sustained and stable investment.

The longer the time, the smaller the risk, which also requires a premise that the investment fund cannot go bankrupt, otherwise there will be huge losses in the fixed investment.