Shopping carts with logos of German supermarket chain Rewe are

FILE PHOTO: Shopping carts with logos of German supermarket chain Rewe are pictured at a shopping centre in Hanau, Germany, March 17, 2016 Rewe said it would file a complaint to the higher regional court in Duesseldorf after Economy Minister Sigmar Gabriel on Thursday approved a merger of rivals Edeka and Kaiser’s. REUTERS/Kai Pfaffenbach