The article discusses economic regionalization in the Asia-Pacific region, focusing on various aspects such as macroeconomic core, microeconomic optimization, and regional integration efforts. It explores differences and consequences of regionalization in Europe and East Asia, as well as the roles of China and India in the Asia-Pacific economic community. The study also delves into the ASEAN Free Trade Area plan, intra-regional trade in developing Asia, and trends, challenges, and prospects of economic regionalism in the region. Additionally, it examines micro impacts of macro adjustment policies, cooperation in finance, investment-led regionalism, trade liberalization, and technology in the service sector. The article also looks at regionalization in South Asia, including the prospect of a trading block, trade cooperation issues, trading arrangements, and the SAARC experience.