
https://thehill.com/opinion/finance/571764-enough-with-the-gdp-its-time-to-measure-genuine-progress?utm_source=newsletter&utm_medium=email&utm_campaign=13%2F09%2F21

http://www.kavalacapital.com/content/20201201-Rapport_ecommerce.pdf

http://www.bertelsmann-stiftung.de/en/topics/aktuelle-meldungen/2017/september/germans-are-more-optimistic-about-their-future-than-their-european-neighbours/