Who needs special and differential treatment?

How can trade policies support development? Fifty years ago, the concept of Special and Differential Treatment (SDT) was introduced and implemented in the form of the Generalized System of Preferences (GSP). This permitted the grant of better trading conditions to developing countries, and preferential tariffs under the GSP were a main pillar. This evident discrimination between countries is allowed under World Trade Organization (WTO) rules. But because GSP is implemented through national schemes, there are variations across donor countries.