- Thirdly, they supply data to the employers' organizations and trade unions, both at sectoral level and at national confederation level. - Fourthly, and most importantly, they supply data to the authorities, not only for tax purposes but also for purely statistical purposes. ###>En quatrième et dernier lieu, la contribution la plus importante des entreprises est de fournir des données à l'administration, non seulement à des fins fiscales mais également à.des fins purement statistiques.