translate English to French: The negative consequences of this are twofold: 1. fiscal, since the state receives nothing from sales of which it is not aware; 2. cultural, because when such commodities are taken off the official market, they are hidden and unknown.
Ceci produit un double mal: 1) fiscal, puisque l'Etat ne perçoit rien des transmissions qu'il ignore; 2) culturel, puisque ces biens, en fuyant le marché officiel sont inconnus et cachés.