These will generally be horizontal restrictions such as price cartels and market-sharing quotas, or other practices which jeopardize the proper functioning of the single market, such as the partitioning of national markets and clear-cut abuse of a dominant position by undertakings holding a virtual monopoly (see Decisions 91/297/EEC, 91/298/EEC, 91/299/EEC, 91/300/EEC and 91/301/EEC (1) - Soda Ash, 94/815/EC (2) - Cement, 94/601/EC (3) - Cartonboard, 92/163/EC (4) - Tetra Pak, and 94/215/ECSC (5) - Steel beams).
Te bodo navadno horizontalne omejitve, kot so cenovni karteli in kvote o delitvah trga ali druga ravnanja, ki ogrožajo pravilno delovanje enotnega trga, kot je porazdelitev domačih trgov in povsem jasna zloraba prevladujočega položaja podjetij, ki imajo dejanski monopol (glej odločbe 91/297/EGS, 91/298/EGS, 91/299/EGS, 91/300/EGS in 91/301/EGS [1] - Soda Ash, 94/815/ES [2] - cement, 94/601/ES [3] - kartonske plošče, 92/163/EC [4] - Tetra Pak in 94/215/ESPJ [5] - jekleni tramovi).