If you make a one-time investment of 2W and hold it for 20 years, it is assumed that there will be an annual income of 10%.

The final income is 20000 * (1+ 10%) 20.

If it is a fixed investment, if you invest for 2 weeks every month and continue to invest for 20 years, this income will be great.

If the total amount of fixed investment is only 2W, then the income and one-time investment are the same.