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Which of the following correctly describes differences in incomes as a result of non-competing groups?
An accountant earns a higher income than her peers because she completes more audits each year.
Professional football players earn higher salaries than retail store clerks.
Construction workers who must work outside in the heat of the summer are paid more than those who complete work indoors in air-conditioned buildings.
Reporters in small towns with only one major newspaper earn lower salaries than reporters in markets with several newspapers.
The income of cattle farmers is affected by the demand for beef.