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https://pubs.aeaweb.org/doi/pdfplus/10.1257/jep.37.4.115
https://ecfsapi.fcc.gov/file/109303096909269/Sage%20&%20Carpenter,%202009.pdf
https://www.dea.gov/sites/default/files/2023-03/DEA%20Foreign%20Review%20Report.pdf