At some point in your twenties, you will probably receive a promotion that lands you a position in which people report directly to you. You are now officially someone’s boss, and you have substantial control over his or her destiny. You’ll probably be ecstatic, running around your home singing, “At last! At last! I’m not the peon anymore! And I won’t make the same mistakes my manager made with me. No way. I know better. I’m going to be the best boss in the world!”

There’s only one problem: you don’t know better. How could you? In many companies, new managers are initiated with no training whatsoever. This is why there are so many bad ones. Being an effective boss requires a skill set that few people possess naturally, and ...

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