https://www.economiesuisse.ch/de/artikel/hohe-loehne-tiefe-ungleichheit-und-ein-attraktiver-standort
http://visegradinsight.eu/app/uploads/2019/11/EaP-2030-Trends.pdf
http://www.bankofengland.co.uk/publications/Documents/speeches/2017/speech971.pdf
https://www.uokik.gov.pl/news.php?news_id=16818