Research shows that a leader's mood is contagious -- and that means that your business will operate differently depending on whether you wear your smiley face or your frowny face, Aaron Windeler writes. Happy bosses have more satisfied employees, researchers say, but employees with grumpy bosses tend to work more productively. "[If] poor effort is the cause of your poor mood, it may not be something you want to hide," Windeler advises.

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