The growth of East Asia’s intra-regional trade is driven largely by increased component trade within global electronics production networks. Data on both electronics trade and production elucidate a pattern of specialization in which upper- and middle-income countries produce sophisticated components and lower-income countries assemble lower- value-added final goods. There is evidence of increasing sophistication within the electronics sector by the Newly Industrialized Economies and to a lesser extent by ASEAN countries. Despite the marked increase in intra-regional trade, developing East Asian countries remain heavily dependent on developed-country markets. When Western export demand rapidly contracted during the 2008-2009 economic crisis, these specialization patterns led the rapid diffusion of the business cycle shock throughout the East Asian region.