In the context of export and import, negative list normally implies the list of items which are not permitted to be freely imported or exported. However, in the context of Free Trade Agreement (FTA), the "negative list" would mean that barring the services and goods listed, everything else could be taxed, making the exempted goods and services cheaper. In other words, item on which no concessions (no reduction in import tariffs) would be allowed. Therefore, an articulated negative list will clearly bring out the intentions of the policy makers as to what precisely is outside the tax concession net.
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