In the trading field, margin call usually refers to the situation where the account funds are insufficient to maintain the position margin requirements due to market fluctuations, and the trading platform forces the position to be closed. From the content you provided, margin call and stop loss are two closely related concepts, and correct fund management and position management are crucial to avoid margin call.

First of all, regarding the view that "the margin call is caused by not setting a stop loss", it is true that if the trader does not set a reasonable stop loss, when the market fluctuates in the opposite direction, it may cause the loss to expand without limit until the margin call. Therefore, setting a stop loss is an important part of risk management.

Then, there may be some confusion about the "stop loss strategy when the position is liquidated" and the "stop loss strategy when the position is liquidated on a position-by-position basis". Usually, the stop loss is a price point set by the trader. When the market price reaches this point, the transaction will be automatically closed to limit the loss. The liquidation is the forced liquidation of the position by the trading platform due to insufficient funds in the account to maintain the position margin. Therefore, the liquidation itself is not a stop loss strategy, but a result of risk management.

Next, regarding fund management and position management, it is indeed very important. Traders should reasonably allocate funds and positions according to their risk tolerance and trading strategies. When using leverage, they should pay more attention to controlling the size of positions to avoid excessive risks due to excessive leverage. At the same time, it is also very important to adjust positions in time according to market fluctuations.

Finally, the construction of a "trading system" does need to include two parts: fund management and trading rules. Fund management is the skeleton, and trading rules are the flesh and blood. Only by building the skeleton of fund management and adding the flesh and blood of understandable trading rules can a complete trading system be formed. The continuous improvement and optimization of the trading system is also a process of continuous learning and progress for traders.

In short, the key to avoiding liquidation lies in correct fund management and position management, as well as reasonable stop loss settings. Traders should formulate trading plans that suit them according to their risk tolerance and trading strategies, and continuously improve and optimize their trading systems in practice.

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