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Is this trick enough to totally prevent bankrupcy in a case of a crash?
Your strategy fails to control risk. Your "inversed crash" is called a rally. And These kind of things often turn into bigger rallies because of short squeezes, when all the people that are shorting a stock are forced to close their stock because of margin calls - its not that shorts "scramble" to close their position, the broker AUTOMATICALLY closes your short positions with market orders and you are stuck with the loss. So no, your "trick" is not enough. There are better ways to profit from a bearish outlook.