
http://www.transparency.org/news/feature/europe_and_central_asia_an_overall_stagnation

https://www.taxpolicycenter.org/sites/default/files/publication/163549/report-taxing-business-incomes-evidence-from-the-survey-of-consumer-finances.pdf

https://www.cbo.gov/system/files/115th-congress-2017-2018/reports/53651-outlook.pdf