That is a very real scenario to watch out for. If a stock is falling and getting into trouble you probably would not know it right away. I would not be so quick to just throw my other stocks money into the one thats falling. Find out whats going on. Is the company in trouble? That would be something to watch out for. If it is and you catch it soon enough it could be replaced with another stock without too much damage.
I did a backtest on these 4 stocks ARTI PALM BWS and ZQK. The backtest was for 21 months. All except PALM were good. PALM though, went from approx $50.00 to $1.50 and ended up at around $4.00. I just followed the formula and still ended up ahead. I don't have the chart here but I believe buy and sell ended up 10% and I was up %20. I was very pleased with the results considering what PALM did.
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