Final answer:
Professional athletes compare performance, face salary issues due to monopsony, fairness of high salaries is debated.
Explanation:
Competition for professional athletes differs from that of amateur athletes in that professionals are more likely to compare their performance against each other. The salaries of professional athletes in team sports often fall short of their Marginal Revenue Products (MRPs) due to monopsony in the industry. Despite the competitive nature of sports, the issue of fairness in high athlete salaries is a topic of debate.
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