
https://www.strategie.gouv.fr/sites/strategie.gouv.fr/files/atoms/files/avis_du_comite_fiscalite_capital-01-10-2019.pdf

https://ukandeu.ac.uk/is-economic-output-an-accurate-measure-of-the-covid-19-impact/

https://cepr.org/sites/default/files/policy_insights/PolicyInsight92.pdf