This paper provides a social network analysis of the business communities in Pompeii and Puteoli, viewed through the lens of the archives of Caecilius Iucundus and the Sulpicii. This approach reveals how entrepreneurs tried to create trust and select reliable witnesses in two very different trading worlds. I argue first that the presence of an ‚international‘ business community in Puteoli necessitated the careful selection of witnesses among colleagues in trade, who were acquainted with someone’s reputation and trustworthiness. In Pompeii on the other hand, the local level of exchange allowed bankers and businessmen to operate in a face-to-face community, where experience in trade was not considered to be a vital criterion to be selected as a witness.
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