The mean is much simpler to calculate: You just need to know the total economic output of a country and devide it by the number of people (for GDP per capita) or number of workers (for salary). To calculate the median, you need individual data for each person. As the latter is not known in many cases, particularly for countries without strong statistical offices, the median is given for international comparison, even if the median would hold more relevant information in. most cases.
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