Across cultures, children develop a dislike of receiving less than others by age 10, but it isn't until later that they begin to feel discomfort when others get the short end of the deal, the new research found. In the study of kids ages 4 to 15 from seven countries, children in just three countries showed any sign of caring about fairness for other kids. "A negative reaction to getting less than others may be a human universal," said study co-author Katherine McAuliffe, a psychologist at Yale University.
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