  International food trade is a growing complement to gaps in domestic food
supply and demand, but it is vulnerable to disruptions due to some unforeseen
shocks. This paper assembles the international crop trade networks using maize,
rice, soybean, and wheat trade data sets from 1986 to 2020. We assess the
importance of economies using multidimensional node importance metrics. We
analyze the correlation structure of different node important metrics based on
the random matrix theory and incorporate 20 metrics into a single metric. We
find that some metrics have many similarities and dissimilarities, especially
for metrics based on the same trade flow directions. We also find that European
economies have a significant impact on the iCTNs. Additionally, economies with
poor crop production play a major role in import trade, whereas economies with
higher food production or smaller populations are crucial to export trade. Our
findings have practical implications for identifying key economies in the
international crop trade networks, preventing severe damage to the food trade
system caused by trade disruptions in some economies, maintaining the stability
of the food supply, and ensuring food security.
