https://www.socialeurope.eu/tax-on-billionaires-political-vaccine-against-the-far-right
https://www.taxpolicycenter.org/sites/default/files/publication/163549/report-taxing-business-incomes-evidence-from-the-survey-of-consumer-finances.pdf
https://www.propublica.org/article/how-private-nonprofits-ultrawealthy-tax-deductions-museums-foundation-art
https://www.esri.ie/system/files/publications/WP677_0.pdf