https://journals.sagepub.com/doi/pdf/10.1177/0010414021997504
https://lawliberty.org/argentinas-disordered-liberty/
https://theconversation.com/an-entry-fee-may-not-be-enough-to-save-venice-from-20-million-tourists-213703
http://www3.weforum.org/docs/WEF_GGGR_2018.pdf