https://ec.europa.eu/commission/sites/beta-political/files/reflection-paper-emu_en.pdf
https://www.linkiesta.it/2020/05/macron-merkel-piano-iniziativa-500-miliardi/
https://www.cesifo-group.de/DocDL/EEAG-2018.pdf
https://www.whitehouse.gov/wp-content/uploads/2021/05/budget_fy22.pdf