Research on the Development Opportunities and Strategies of Digital Trade in the Guang-dong-Hong Kong-Macao Greater Bay Area under the Background of "Dual Circulation"

Based on the "dual circulation" strategic framework, this study constructs a three-dimensional collaborative theoretical model of "system - industry - tech-nology" and proposes differentiated development strategies. Research findings show that the Greater Bay Area, relying on the institutional advantages of "one country, two systems, and three customs territories", has formed dis-tinctive advantages such as cross-border e-commerce, digital infrastructure, and a closed loop of the innovation chain. However, issues such as data standard barriers, core technologies being controlled by others, and the lagging trans-formation of small and medium-sized enterprises in the three regions still re-strict its devel-opment. The international competitiveness of digital trade in the Greater Bay Area can be effectively enhanced through institutional measures.