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We analyze patterns of informal information exchange by the English East India Company's captains to assess the role of relational and institutional governance systems and uncertainty in encouraging information exchange. Using archival data from the emerging early-modern global trade network, we show that uncertainty drove information exchange. Relational-based contract enforcement mechanisms such as small group exchange were largely absent, and increasing institutional strength was associated with decreasing rates of information exchange. The results suggest that opportunity and demand were more important determinants of information exchange than the emergence of formal and informal governance systems.

Individuals engaged in overseas trade in the early modern period often faced high levels of uncertainty regarding their prospects for trade. One way of managing uncertainty is to gather information from others through social interactions, that is, through social networks. Here we consider how social ties impacted trade patterns by analyzing the relationship between port traffic and early modern ship captains' exposure to information about ports using informal relations. We consider the possible impact of strong and weak ties and the use of ties under different types of uncertainty. The analysis suggests that social networks encouraged trade at port cities with already high rates of traffic, though this effect is less pronounced than for other means through which information was distributed throughout the trade system.

Long-term collaborations are crucial in many creative domains. Although there is ample research on why people collaborate, our knowledge about what drives some collaborations to persist and others to decay is still emerging. In this paper, we extend theory on third-party effects and collaborative persistence to study this question. We specifically consider the role that a third party's helpful behavior plays in shaping tie durability. We propose that when third parties facilitate helpfulness among their group, the collaboration is stronger, and it persists even in the third's absence. In contrast, collaborations with third parties that are nonhelpful are unstable and dissolve in their absence. We use a unique data set comprising scientific collaborations among pairs of research immunologists who lost a third coauthor to unexpected death. Using this quasi-random loss as a source of exogenous variation, we separately identify the effect of third parties' traditional role as an active agent of collaborative stability and the enduring effect of their helpful behavior—as measured by acknowledgments—on the persistence of the remaining authors' collaboration. We find support for our hypotheses and find evidence that one mechanism driving our effect is that helpful thirds make their coauthors more helpful.