The establishment of trust is a key component of economic activity and social ties can make business dealings work better. However, we do not know much about how economic actors created deliberately new social ties in order to pursue their objectives. This article analyzes the way in which merchants and entrepreneurs recurred to specific rituals to establish formal social ties, with the intent of protecting their business relationships. It focuses on relational instruments that until now had been neglected, particularly godparenthood and marriage witnessing. It shows that formalization, ritualization and publicity of ties were used by entrepreneurs to establish trust with their business associates, for example when information was asymmetri...