
https://cps.org.uk/wp-content/uploads/2021/09/210918224828-CPSWELFAREPAPER1.pdf

https://reutersinstitute.politics.ox.ac.uk/sites/default/files/2019-06/DNR_2019_FINAL_0.pdf

https://www.brookings.edu/essay/the-wall-the-real-costs-of-a-barrier-between-the-united-states-and-mexico/?utm_campaign=brookings-comm&utm_source=hs_email&utm_medium=email&utm_content=55521719