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That's not true. It really doesn't mean you would lose your account without stop loss. I don't use it some times and I just prefer to have my trade monitored, close them when I'm done and I end up still making good profit from the market. It all depends on knowledge and the skills you have.if we do not set SL. i think one day we will lose all account. because we will wrong in a other time.
Martingale has nothing to do with stop loss. You can do martingale and use stop loss. In fact martingale is using stop loss. What is important in martingale is that if you loss you going to double your lot size and hope to earn back your previous loses.The importance of the stop-loss due to the fact that any trader, even the most successful beyond, with great trading can fail. No one can sell to break even, which would be a great trading system will not be used in trade. Therefore, the problem of rational limit losses and risks is one of the most important tasks. If it is successful, then, even with a 3-4 winning trades out of 10, you will not incur losses, if at least 5-6 out of 10 transactions will be positive, you already get income. And it's all thanks to calculate correctly and successfully applied the stop-loss.
There are trading strategies that do not involve the use of stop-loss, most often based on the series of Martingale, or, instead of stop-loss insurance, various hedge. If in the case of hedge trade risks really are compensated, and it has every right to exist (by the way, in many hedge strategies stop-loss are still used), the Martingale strategy is almost always the way to an early plum deposit.
I can say that the art of properly set stop-loss and a successful trade are virtually synonymous. Even if your trading system is far from perfect and gives a lot of failed trades, but you are wise to limit your losses, then it can sell at a profit, albeit a small, but profitable, or as a maximum with small losses.