
http://ec.europa.eu/transport/sites/transport/files/pocketbook2016.pdf

https://www.brookings.edu/blog/techtank/2020/07/31/big-tech-and-antitrust-pay-attention-to-the-math-behind-the-curtain/?utm_campaign=Brookings%20Brief&utm_medium=email&utm_content=92428572&utm_source=hs_email

https://www.imf.org/-/media/Files/Publications/WP/2021/English/wpiea2021021-print-pdf.ashx