
https://www.brookings.edu/articles/disquiet-in-the-worlds-middle-class/

https://www.strategie.gouv.fr/sites/strategie.gouv.fr/files/atoms/files/fs-na82-entreprises-zombies-octobre-2019.pdf

https://www.mckinsey.com/business-functions/organization/our-insights/purpose-shifting-from-why-to-how#