According to the WTO and its MFN principle, all preferential tariffs granted to a member have to be extended to all others. However, there are exceptions to this rule; and this is where all...

According to the WTO and its MFN principle, all preferential tariffs granted to a member have to be extended to all others. However, there are exceptions to this rule; and this is where all preferential trade agreements originate. The EU, for example, is an exception, even if it is of the most complete kind. List the typologies existing in this area and how would a country select which to belong to? Explain with an example.