translate English to French: As these supermarkets and hypermarkets control the vast majority of the market, they are continuing to pressure manufacturers to lower prices which is creating difficulty for medium and small-scale producers.
Quelques grandes chaînes de magasins d’alimentation dominent la vente au détail de produits alimentaires, les quatre principales (Tesco, Asda, Sainsbury’s et Safeway) accaparant environ 70 % du marché.