A large loss may not give you much room to maneuver; to adjust to the environment. A large loss will likely cripple you emotionally. A series of small losses will have given you a chance to participate in a number of potential moves -- and trading is a numbers game. A large loss means you spent a lot of time and money on one opportunity -- a bad one. Your choice.you can take a lot of small losses regularly, or one large loss rarely. Same thing only the one large loss saves you quite bit on spread and commissions, and allows you much larger margin for error if your entry was not quite right...
As to your comment about allowing a much "larger margin for error if your entry was not quite right," I'm not sure that's the best way to deal with uncertainty. If your timing is "not quite right," you have no way of knowing just how wrong it is. So why give it room? Consider walking in the dark, and not being certain exactly where the furniture is. Do you take large, bold strides? Or do you take smaller, tentative steps? If you chose smaller, tentative steps, then why treat the market any differently? Once you know your timing is right, you can afford to take a few larger steps.
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