A new study of the World Customs Organization analyses the main practices concerning the management of the preferential origin rules, as well as the certification and verification procedures of the relevant proofs implemented by different Countries worldwide. The study reiterates that the high number of Free Trade Agreements leads to a complication of the international trade system, due to the proliferation of such restrictive and onerous rules, taht contribute to raise the transaction costs for business, as recently pointed out by the World Trade Organisation in the World Trade Report (2011).
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