https://www.frontier-economics.com/media/5550/a-wholesale-gas-price-cap-in-europe.pdf
https://www.gov.uk/government/news/david-davis-speech-at-ubs
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://works.bepress.com/ghadfield/71/download/