In Warring States China, about 300 BC, a loan could be written on a tally of wood or bamboo. The tally was split in two, and lender and borrower each kept a half.
To collect, the halves were fitted together. If they matched, the debt was proven. Chapter 79 of the Tao Te Ching, credited to Lao Tzu, turns this everyday object into a lesson.



