http://ec.europa.eu/finance/docs/law/171011-communication-banking-union_en.pdf
https://www.socialeurope.eu/2017/07/european-welfare-states-perform/
https://www.project-syndicate.org/commentary/eurozone-sustainable-economic-recovery-by-simon-johnson-2017-06
https://taxfoundation.org/flat-tax-state-income-tax-reform/