https://www.ippr.org/files/2017-09/cej-interim-report-summary-170911.pdf
https://www.brookings.edu/blog/up-front/2020/03/02/the-future-will-be-shaped-by-what-global-productivity-growth-does-next/?utm_campaign=Brookings%20Brief&utm_source=hs_email&utm_medium=email&utm_content=84171029
https://sipri.org/sites/default/files/2017-12/sipriinsights1712_.pdf
https://www.ft.com/content/36ae6198-9ee1-4144-96c1-039bd7e32893