In the great temple and palace complexes, not only did money serve largely as an accounting measure rather than physically changing hands, merchants and tradespeople developed credit arrangements of their own. Most of these took the physical form of clay tablets, inscribed with some obligation of future payment, that were then sealed inside clay envelopes and marked with the borrower’s seal. The creditor would keep the envelope as a surety, and it would be broken open on repayment. In some times or places, at least, these bullae appear to have become what we would now call negotiable
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