Rules of origin determine product nationality and trigger preferential tariffs, quotas, anti dumping and countervailing measures.

Rules of origin set the criteria for where a product is made or obtained and determine eligibility for preferential tariffs, quotas, anti dumping and countervailing measures; they also underpin trade statistics and origin labelling. Under GATT there was no single international rule for origin determination, and contracting parties historically retained freedom to adopt multiple origin rules for different regulatory purposes.

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