How do political preferences and voting behaviors respond to information coming from abroad? Focusing on the international migration network, I document that opinion changes at the origins spill over to 1st- and 2nd-generation immigrants abroad. Local diasporas, social media, and family ties to...

In online social networks, social information, i.e., content generated and shared by users (e.g., past purchases), can be a substitute for sponsored advertising, which constitutes the network's main source of revenue. When will social information be let to spread freely over the platform? We...

Evaluating the impact of policy interventions on respondents who are embedded in a social network is often challenging due to the presence of network interference within the treatment groups, as well as between treatment and non-treatment groups throughout the network. In this paper, we propose...

We examine how trade sanctions can be imposed effectively in a trading network. We focus on three factors that affect trade sanctions: a country’s endowment, distance between trading countries, and connectivity in the network. Our models explain several empirical observations: (i) sanctions...

This paper introduces a novel form of moral hazard specific to networks and illustrates this concept using simple models from coordination games, epidemics, supply chains, and financial networks. In these models, agents form beneficial links that also propagate costly contagion. Endogenously,...

In this paper we exploit a unique and rich dataset of patent applications and scientific publications in order to answer several questions concerned with two current phenomena on the way knowledge is produced and shared worldwide: its geographical spread at the international level and its...

This study investigates Chinese firms’ co-patenting and citation networks and examines their evolution since 1985. We used a comprehensive dataset of Chinese firms’ patent filings to analyze these networks changing structure over time. We constructed these networks and analyzed their growth,...