Error: Confusing trading with investing. Many traders justify taking trades because they think they have to keep their money working. While this may be true of money with which you invest, it is not at all true concerning money with which you speculate. Unless you own the underlying commodity, for instance, selling short is speculation, and speculation is not investment. Although it is possible, you generally do not invest in futures. A trader does not have to be concerned with making his money work for him. A trader’s concern is making a wise and timely speculation, keeping his losses small by being quick to get out, and maximizing profits by not staying in too long, i.e., to a point where he is giving back more than a small percent of what he has already gained.