Essentially, bragging about how busy you are gives the impression that you are valuable and in high demand, like my young train friend. Instead of wearing expensive products and demonstrating that one’s clothing has high value, a person who’s very busy is implicitly bragging about their intrinsic worth, their own intelligence. They might talk about all the appointments and tasks on their calendar or they may respond to most invitations by saying, “I’ll have to check my schedule.” When you ask how they are, instead of saying, “Fine,” they might say, “Busy!”