The currency of international trade has been on a lot of peoples' minds in the last few years. The hierarchy of currencies literature, the related questions of reforming the international monetary and financial system (IMFS), the effects of US monetary policy on the rest of the world (ROW). Add to that the war in Ukraine and Chinese trade-related discussion on the role of the ruble, dollar, yuan, oil and natural gas, wheat etc.
Let's look into the actual ethnography.
Humphrey's primary ethnographic research for the paper Graeber cites as definitive was based on her research of the Lhomi of the Arun Valley in northern Nepal near the Tibetan border.
Of the Lohmi, Humphrey writes (1985, pp.54-55): "Before the virtual closure of the Tibetan border by the early 1970's which followed the Chinese invasion, the Lhomi engaged in three kinds of barter." These are: