Much like professional sports, trading is a high-performance activity. Traders need to be in their best possible state of mind both emotionally and psychologically, and their cognitive thinking must be free of bias or prejudgment. There is a fine line between calculated risk taking and gambling. Traders need to be aware of and in control of some of the basic and instinctive emotions (such as fear, stress, and anxiety) that have saved humans from dangers through the centuries but can be destructive in modern life. Psychological challenges in trading are not only constrained by our instincts, but also can be affected by the influences of peers, family and society in general. Similar to traffic jams, greed is a by-product of human civilization, and it can be extremely dangerous for traders without a keen understanding of the role and significance money plays in their lives.