Narcissists are an unpopular bunch, typically associated with the reality-TV egomaniacs or pouting selfie-fanatics. But we shouldn't be too quick to decry self-adoration, said a Harvard psychologist, because a little bit of grandiosity can be a very good thing.In 350 BC Aristotle asked, "Who should the good man love more? Himself, or others?" and came up with the surprising answer: "The good man is particularly selfish."Harvard psychologist Dr Craig Malkin agrees, stating: "Healthy narcissists are leaders of companies or states and inspire those around them instead of undermining their colleagues."Healthy narcissists bring out the best in people and, though far from modest, they do not brag about their achievements. But, without a sense of personal grandiosity, Malkin said, no one would be compelled to produce something great.Moderately narcissistic teenagers have been found to be less anxious and depressed than their peers, and to form stronger relationships. And corporate leaders with moderate narcissism are rated as better and more effective by their employees.Malkin said that although extreme narcissists will lie, cheat and steal to feel special, there are "subtle narcissists" who are less brazen.Subtle narcissists are often introverted and seemingly well-adjusted but they can experience an "entitlement surge", and force uncomfortable feelings of insecurity onto those around them.So a boss who's anxious about a big deal might tear down a subordinate as a way of making someone else feel incompetent...