9. The parties to the interim agreement notify the Trade in Goods Council of substantial changes to the plan and timetable contained in this agreement and, upon request, the Commission reviews the amendments. The fourth round returned to Geneva in 1955 and lasted until May 1956. 26 countries participated in the cycle. $2.5 billion in tariffs have been eliminated or reduced. Reaffirming that the aim of these agreements should be to facilitate trade between the constituent regions and not to create barriers to trade between other members with territories, and that, when they are created or enlarged, the parties should, as far as possible, avoid adverse effects on the exchanges of other members; The working hypothesis for collective bargaining was a linear reduction of 50% in tariffs, with the smallest number of exceptions. A long-term argument has developed about the trade effects of a uniform linear reduction on the dispersed rates (low tariffs and high rates quite far away) of the United States compared to the much more concentrated rates of the EEC, which also tended to be under the ownership of U.S. tariffs. 4. The contracting parties recognize that it is desirable to increase trade freedom through the development of closer integration between the economies of the countries parties to these agreements through voluntary agreements. They also recognise that the objective of a customs union or free trade area should be to facilitate trade between the affected areas and not to create trade barriers for other contracting parties with these zones.

Recognising the contribution to the expansion of world trade, which can be made by closer integration between the economies of the parties to these agreements, (a) in the case of a customs union or an interim agreement leading to the establishment of a customs union, tariffs and other trade regulations that are instituted at the institution of such an agreement or agreement with the contracting parties who are not parties to this Union or agreement must not not, on the whole, be higher or more restrictive than the general impact of tariffs and trade rules applicable in the affected areas prior to the formation or adoption of such an association, as appropriate; The WTO continues to categorize these agreements into the following categories: even without the constraints imposed by the most favoured nation clauses and national treatment, it is sometimes easier to obtain general multilateral agreements than separate bilateral agreements.