First off, don't do the "wing it" or random kind of move because, most often than not, that would result to a loss because those moves are basically not based on any intellectual thought or at least strategy. I think the better consideration is the percentage of profit, if you have a profit in mind, then stick to it because that would be your guiding principle in doing business. The thing about this market is that assets may go up or down in extremes, but the difficult part is to chance upon those times when it's at its lowest, which is the best time to buy, and when it's at its highest when it's the best time to sell. Therefore, by setting a profit goal, you can be able to still gain while following a strategy, instead of just being random with your business moves.