Temperament is also important. Independent thinking, emotional stability, and a keen understanding of both human and institutional behavior is vital to long-term investment success. I’ve seen a lot of very smart people who have lacked these virtues.
Also, investing is simple, but not easy. It requires independent thinking and emotional intelligence more than IQ. When markets are tumbling and fall like no tomorrow, IQ is not going to help you to stay away from selling and buy even more at most bargaining prices.
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