This paper investigates the impacts of COVID-19 on international production networks in machinery sectors by shedding light on negative supply shocks, negative demand shocks, and positive demand shocks. Specifically, we examined changes in trade in the trade-fall periods amid COVID-19 in 2020 using Japan's machinery trade at the most disaggregated level and decomposed them into two intensive margins (i.e., the quantity effect and the price effect) and two extensive margins (i.e., the entry effect and the exit effect). Our empirical results show that trade relationships for parts and components were robust even amid COVID-19 and that international production networks in machinery sectors were almost intact. They also demonstrate that COVID-19 brought positive demand shocks for specific products with special demand due to its nature in addition to negative supply shocks and negative demand shocks, which partially explains heterogeneous effects not only among sectors but also among products in the same sector. As of October 2020, Japan's machinery trade seems to have mostly recovered.

Many people have a vague notion that the room for expanding international production networks is almost exhausted and that therefore international trade has slowed down since the recovery from the great trade collapse. This paper presents evidence against such a belief in the East Asian context by classifying finely disaggregated trade data based on the stages of the production process. The trade slowdown was attributed mainly to sluggishness of trade in primary goods and processed raw materials. In contrast, East Asian trade in manufactured parts and components and the assembled end-products within production networks continued to expand steadily.

This paper assesses the recent widening and deepening of machinery production networks in ASEAN by using highly disaggregated international trade data over 2007–13. Based on both traditional trade value data analysis and a novel approach to the diversification of exported products and destinations, we confirm the steady development of back-and-forth trade links, notably with East Asian partners, centering on Singapore and Thailand. In addition to the five ASEAN forerunners, Vietnam is an increasingly active player in such networking. Although their degree of participation is still limited, Cambodia, Lao PDR, and Myanmar also show signs of joining production networks.