Or think of the debt collection industry, which maintains a pretense of careful record-keeping as the basis for hounding and threatening people, but which is, in reality, a barely coherent trade in spreadsheets whose claims to our money are matters of faith:
https://pluralistic.net/2023/08/12/do-not-pay/#fair-debt-collection-practices-act
For usury, the chaos is a feature, not a bug.
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