https://www.taxpolicycenter.org/sites/default/files/publication/163549/report-taxing-business-incomes-evidence-from-the-survey-of-consumer-finances.pdf
https://www.emcdda.europa.eu/system/files/publications/13838/TDAT21001ENN.pdf
https://itep.org/amazon-in-its-prime-doubles-profits-pays-0-in-federal-income-taxes/