[Lammy]

> frankly, too US-centric

Try buying petroleum from OPEC in anything but USD: https://www.opec.org/opec_web/en/data_graphs/40.htm

Corollary: http://www.cnn.com/2000/WORLD/meast/10/30/iraq.un.euro.reut/

[chrisco255]

USD is the world reserve currency. Most international trading occurs in terms of dollars.