Both funds and stocks earn bid-ask spreads. Only by buying at a low price and selling at a high price can they make profits. Long-term stocks basically do not operate after buying stocks (positions can be increased or decreased according to the profit and loss situation), while the fund fixed investment system will automatically buy funds according to the set conditions, and basically do not need to operate after setting fixed investment. The fixed investment of funds is the average income and cost, while long-term stocks and fixed investment of funds are value investments, which are more suitable for stable investors.