By establishing a customs union between themselves Member States aim to contribute, in the common interest, to the harmonious development of world trade, the progressive abolition of restrictions on international trade and the lowering of customs barriers.
Tri aontas custam a bhunú eatarthu féin, tá d'aidhm ag na Ballstáit cuidiú, ar mhaithe leis an leas coiteann, le forbairt chomhchuí ar thráchtáil an domhain, le díothú comhleanúnach srianta ar an trádáil idirnáisiúnta agus le hísliú bacainní custam.