The most suitable job candidates in many industries often have a common personality flaw, write Ray Fisman and Tim Sullivan. For instance, workers who gravitate toward airport-security jobs tend to be "sticklers for rules" but can lack customer-service skills, Fisman and Sullivan write. This phenomenon is particularly troubling in fields such as law enforcement, where a violent predisposition can translate to a certain proficiency and passion for the job, they write.

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