https://www.economiesuisse.ch/de/artikel/hohe-loehne-tiefe-ungleichheit-und-ein-attraktiver-standort
https://www.europarl.europa.eu/RegData/etudes/IDAN/2021/699811/IPOL_IDA%282021%29699811_EN.pdf
https://reutersinstitute.politics.ox.ac.uk/sites/default/files/2020-06/DNR_2020_FINAL.pdf
https://www.tandfonline.com/doi/full/10.1080/09692290.2022.2107043