Socio-Economic Classification (SOCIO02), v1:2002
the source of income, it is determined whether a person is self-employed, assisting spouse, employee, unemployed or outside the workforce, including pensioner
https://www.dst.dk/en/Statistik/dokumentation/nomenklaturer/socio?id=8674e29b-7c45-4a2c-830c-b9edc80119ae