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some fallacies that could be used for middle school students would be that "everyone thinks that the are cool", "these clothes are trendy", "Your grandmother would even love these clothes"
Fiverr works just like any other marketplace. Sellers list their services (gigs) and buyers who are interested in these services ask questions and if they are satisfied with answers, purchase them. Fiverr works like a middleman guaranteeing both parties are happy with the end result.