People are used to calling these four grain merchants "ABCD" according to the first letter of their names. The four major grain groups, which occupy the main share of world grain trade, keep a low profile, and there is not much news about them, but no one can underestimate their role in the world grain environment. Former US Secretary of State Henry Kissinger once warned the world that if you control food, you control mankind.
It is a joke to say that the four major grain merchants control mankind, but it is an indisputable fact to control grain. Understanding them plays an indispensable role in summing up the development of grain industry in China.