In his interview, «Market Wizards» Dr. Van K. Tharp gives a characterization of the trader — the underdog. The common feature of all the losers is a high susceptibility to stress and the inability to protect themselves from stress. They typically negative view of life, they expect the worst, they have a lot of conflicts with their own individuality. They tend to blame others when something goes wrong. This portrait is groundless. If a trader is easily excited and pessimistic at the same time, it can not effectively apply their skills and abilities, does not believe that he could succeed in the long term and remain in the stock trading business. Despite the fact that there is a general idea of who can become a successful trader, scientific papers on this topic is almost unknown.