Andersson, Pernilla (contributor); … - 2004 - [Elektronische Ressource]
"When studying income differences and income distribution, the self-employed are often excluded from the population … extent as incomes from being an employee. On the other hand it is a problem to exclude the self-employed when studying income … differences if the group is large, if the share that is self-employed differs between groups and if there is a difference in the …