The behaviour:

The benefits:

Dr. Maccoby finds that the most revered business leaders in the United States - Bill Gates, Larry Ellison, Jack Welch, Steve Jobs and Jeff Bezos among them - are driven, above all, "by power and glory."

Narcissists can be "emotionally distant and highly distrustful," Dr. Maccoby says. "Perceived threats can trigger rage. Achievements can feed feelings of grandiosity."

The costs (to the jerk):

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