Dividend reinvestment, commonly known as rolling interest calculation, means that when the fund pays dividends in cash, the fund holder directly uses the cash obtained from the dividends at the fund price of the day to purchase the fund and increase the original fund share. For fund managers, there is no cash outflow from dividend reinvestment, so dividend reinvestment usually does not charge subscription fees. Fund managers encourage investors to invest more, so there is generally no charge for dividend reinvestment. If investors want to invest more after receiving cash dividends, they will be regarded as new subscriptions and need to pay subscription fees. Therefore, choosing dividend reinvestment is conducive to reducing the cost of investors, and dividends can also be operated like buying individual stocks.