The fixed investment of a fund is to invest in a specific fund according to a predetermined period and amount. Its advantage lies in diluting costs and smoothing risks by extending the investment period. Its essence lies in automatically reducing the subscription share when the net worth is high and automatically increasing the share when the net worth is low. In the environment where the bull is short and the bear is long, more shares can be guaranteed when the net worth is low, thus reducing the overall purchase cost. After a little in-depth thinking, we will find that the effective premise of fixed investment strategy lies in the change of fund net value, that is, the more drastic the price change, the more obvious the effect of fixed investment strategy. It can be assumed that in extreme cases, if a fund is 1.000 yuan per day without any fluctuation, then the effect of fixed investment and single investment is the same. Based on this, the answer is already obvious: the fixed investment should choose funds with large fluctuations in net value. Among the above four types of funds, equity funds and hybrid funds are obviously the two types that best meet the volatility characteristics of fixed investment. Therefore, it is best to choose stock funds and hybrid funds with high volatility for fixed investment.

According to the different investment objects, funds can be roughly divided into four categories. The goods base, that is, the money fund, mainly invests in various short-term bonds with strong liquidity, short-term financial management tools, cash and so on. The cargo base has strong liquidity and low risk, and some cargo bases are almost equivalent to cash. The most typical balance treasure is the money fund. Debt-based, that is, bond funds, mainly invest in various bonds such as government bonds, corporate bonds and corporate bonds. Debt-based income is slightly higher than that of money funds, and the risk is small. Stock base, that is, stock fund, mainly invests in stocks of various companies. The risk of stock type is relatively high, and the income is relatively high, which fluctuates like the stock market. Hybrid funds invest in stocks and bonds. Naturally, the income of hybrid funds is between debt base and stock base, and the risk and volatility are also between debt base and stock base. The essence of stock funds and hybrid funds is nothing more than giving money to experts, and the performance of investment directly depends on the level of experts investing in stocks.