At first glance, you will feel that it is good to buy on dips and think that you have the initiative. However, there are serious logical loopholes. Suppose it fell today and increased its position. But it fell for three or five days in a row? What about another month? Are you in or out? What if it falls more and more? Don't you panic?

As shown below, according to the logic of buying on rallies, the green box is adding positions almost every day.

Ordinary people are afraid of falling for a week or two and stop, and doubt their life (that is, only add positions in the first half of the continuous decline), then your position cost is on the high side.

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There are three questions:

1. The ups and downs are all in the past tense, so it is impossible to drag the ups and downs that did not happen in the future into a comparative trend. But the money we want to earn is the money of the past+the money of the whole time line in the future.

This is obvious in the chart just now. If there is a continuous long-term decline, most people are afraid to continue to add positions. Even if you buy on rallies, you are unlikely to buy at the lowest point of the shock. Because the ups and downs are often continuous for several days or even longer, and there is no law. It's not always up and down. People who want to buy on rallies hope to show their intelligence and value through their own initiative. So the logic of the starting point does not hold.

2. According to the knowledge of ordinary people, they generally have no ability to choose time.

With our common leek knowledge reserve, it is impossible to predict the short-term future trend every day (neither Great God nor Buffett can). This is the job of a professional fund manager. We are all capable. What do we want them to do? Isn't it sweet to buy stocks directly by yourself?

3. Manual operation requires worry and energy.

If you want to buy on dips, you need to follow suit every day. Especially since I have a lot of money in my hand. As soon as the amount of funds comes up, the time will double. You may even want to analyze the reasons for the ups and downs to predict the future. But the problem is that you may not be able to analyze it at all.

If you have an objective understanding of the above and like the freedom of operation, it is understandable.

And fixed investment: the machinery runs automatically and shares the cost in the long river of time. Save trouble, you can manually pause if the situation is wrong, and you can also choose a variety of intelligent fixed investment (buy more on dips and buy less on rallies) modes, which are actually smarter than you think.

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Choose the way that suits you according to your actual situation.