When trading in the market, the unavoidable problem is the transaction cost.

The second question: success rate

The market trend is very random. You may or may not always be right about the short-term trend. In the long run, whether buying or selling, the success rate will tend to be 50%. That is to say, in a complete trading transaction, the correct rate of selling a position (that is, judging that the position has fallen) is 50%, and the correct rate of buying a new target (judging that it will rise) is also 50%, and the probability of being correct twice is halved to only 25%.

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