Regional trade agreements are very difficult to conclude and claim when countries are more diverse. The ASEAN bloc has largely eliminated all import and export taxes on goods traded between them, with the exception of Cambodia, Laos, Myanmar and Vietnam, which continue to impose nominal duties on certain items. But these will also be fully lifted on 31 December 2015, so that the entire region will be duty-free from that date. Recognising that, since the creation of the GATT in 1947, unions and free trade zones have increased sharply in number and importance and now cover a significant share of world trade; Content of agreements The essential element of each agreement is trade in goods (including tariff reductions and other trade restrictions). They regulate trade in industrial products (SH chapters 25-97), fish and processed agricultural products. Trade in unprocessed agricultural products is generally governed by separate bilateral agricultural agreements. First, the parties that signed a free trade area applicable to trade with non-parties to that free trade area at the time of the creation of that free trade area must not be higher or more restrictive than tariffs and other rules applicable in the same signatory countries prior to the creation of the free trade area. In other words, the creation of a free trade area to give preferential treatment to their members is legitimate under WTO law, but parties to a free trade area are not allowed to treat non-parties less favourably than before the creation of the territory. A second requirement under Article XXIV is that tariffs and other trade barriers must be eliminated primarily for all trade within the free trade area.  There are a large number of trade agreements; some are quite complex (the European Union), while others are less intense (North American free trade agreement).
 The resulting level of economic integration depends on the specific nature of the trade pacts and policies adopted by the trade bloc: 3.