In December 2015 the ASEAN Economic Community (AEC) went into effect. It was the culmination of a process that began with the Bangkok Declaration in 1967 and represents the most significant economic integration initiative among developing economies in the world. A notable milestone to be sure, but the region has a long way to go before it will be able to attain its original goal of creating a 21st century single market and production base. Meanwhile, ASEAN needs to nest the next stage of its cooperation program in the context of emerging megaregional trade arrangements, namely, the Comprehensive and Progressive Agreement on Trans-Pacific Partnership (CPTPP) and the Regional Comprehensive Economic Partnership (RCEP), and the future expansions of both. In addition, it has to do this at a challenging time for the global trading system upon which it depends; the US-China trade war continues with no clear resolution on the horizon, the World Trade Organisation is at an impasse, and the Covid-19 pandemic has decimated global trade in the short run and may have long-term implications (UNCTAD 2020).
In recent years we have witnessed increasing prominence of trade in intermediate goods and services. The fragmentation of global value chains (GVCs) has been motivated by sourcing intermediate inputs from more cost-efficient producers in order to enhance efficiency. In estimating welfare and sectoral effects of mega-regional trade agreements (MRTAs), such as the Trans-Pacific Partnership (TPP) and the Regional Comprehensive Economic Partnership (RCEP), it is necessary to construct a global dynamic computable general equilibrium (CGE) model that incorporates the GVC structure.