Sheldon is a bit of a germaphobe and flu season may be the worst time for him. While one sneeze could be caused by a variety of different items, someone who is sick may be contagious and harm others. Having the flu can impose a variety of external costs on others if they get sick. These externalities often plague college classrooms around exam time though, but it’s not as convincing of a story as The Dead Grandmother/Exam Syndrome.
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