This reminds me of a chronic gamblers. I have met many of them in horse racing when I go to the race track. If they lose their $10 bet they would bet more than that on the next and on the next until all their money is gone before the day ends. In investing that tendency should be avoided. You have to keep your cool when you lose, gather your senses before investing again.Avoid what I call "revenge investment." You've just made a loss on an investment and you're so eager to make it up. This always lead to bad investment as one is more likely to take uncalculated risk.