Not having a stop loss is what kills an amateur and having a stop loss is what kills an active day trader..
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Personally I think, a day trader doesn't need a stop loss order of 5 to 10 to 20 points.. These stop losses over a period of time will burn your pocket.. For a day trader there are only 2 things to do , if the trade is right sit or wrong exit.. Don't understand the concept of having 5 , 10 or 20 point stops.. It will chop you once too many times..
But is Stop loss required?? It is mandatory, but as an insurance rather than anything else.. During all my trading, the biggest problem spots where the days there was some news released, or some bomb blast or some result.. These are the few times when you need the stop loss in the system, because big moves can eat away profits made over a year in 5 mins of day trading... This again I am speaking as a pure day trader...