promise

約束　—　Institutions

Settling to make good later.

Zhongtong Yuanbao Jiaochao note — A photograph of what this word names.

Banknote of the Banque Royale — A photograph of what this word names.

⚠ A banknote, ultimately, is a promise written on paper. As long as the promise continues to be fulfilled, the paper functions as currency. The moment it becomes clear it will not be fulfilled, it reverts to being just paper.