Alongwiththeemergenceofaworldwidetrendofeconomicregionalism,theSoutheastAsiancountrieshavetakenaninitiativeinpromotingsub-regionale-conomiecooperation,notablyintheformof“growthtriangles”or“naturaleco-nomicterritories”.Asthisnewdevelopmentishelpfultoenhanceeconomiccom-plementarityandmutualbenefitamongthememberstates,itwillcertainlygiveagreatimpetustothefurtherdevelopmentoftheSoutheastAsianeconomy.