https://elpais.com/opinion/2023-12-13/la-batalla-de-las-dos-europas.html
https://pubs.aeaweb.org/doi/pdfplus/10.1257/jep.34.2.172
https://www.socialeurope.eu/inequality-europe-can-done
https://www.ombudsman.europa.eu/en/doc/correspondence/en/165342