When buying an index fund, you can choose to buy it at one time, which is the most common way.
Choosing a one-time investment index fund requires an appropriate opportunity. Buy when the index is undervalued and enter cautiously when it is overvalued. If you are sure that you are very sensitive to market changes, you can buy low and sell high, and you can try. In the case of accurate timing, one-time investment can be said to be the most profitable index investment method.
If you don't do a good job in timing the index, then the fixed investment of the index fund is more suitable for you.
Time and quota, share the cost, get long-term stable income, and exchange time for space.
Index funds can save trouble and effort, spread risks, and are especially suitable for investors who want to save regularly and have long-term investment goals.
Fixed investment takes a long time to accumulate, and investors with stable investment style will be more inclined to vote. If they are aggressive investors based on seeking success, they may not be able to bear the loneliness of fixed investment or you can choose the 28 strategy.
Specifically, 20% of the funds are allocated to volatile industries or theme index funds, and 80% of the positions are allocated to broad-based index funds. The stock market has the characteristics of two or eight rounds, and the market style will constantly switch between large-cap stocks and small-cap stocks. Through the "28" strategy, you can hold relevant index funds regardless of market style. This strategy is generally used to construct the fund portfolio of index funds and can be used in conjunction with the first two strategies.