The document discusses the structure and function of preferential trade agreements (PTAs), including free trade agreements (FTAs) and customs unions, highlighting their definitions, formation, and common features. It notes trends in regional trade agreements, mentioning the increasing number of notified and active RTAs, and addresses the ideological debate surrounding non-discrimination and multilateral trade systems. The document also emphasizes the driving forces behind PTAs, especially in the context of stalled negotiations in the Doha Round and the need for deeper economic integration among select nations.