Calendrier du 07 octobre 2019
Roy Seminar (ADRES)
Du 07/10/2019 de 17:00 à 18:30
salle R2-21, campus Jourdan - 75014 Paris
PEREGO Jacopo (Columbia)
Belief Meddling in Social Networks: an Information-Design Approach
écrit avec Simone Galperti
Social media have become an increasingly important source of information about political, social and economic issues. While beneficial on many levels, the decentralized nature of these media may expose societies to novel risks of manipulation by third parties. To evaluate these risks, we study a model where a designer sends information to agents who interact in a game, so as to affect its outcome. The designer can communicate only with a limited number of agents, who then share information with each other on a network of social links before playing the game. We characterize the equilibrium outcomes that can be induced by seeding this social network with information. Our main result recasts this constrained information-design problem in terms of an equivalent linear program, which is particularly useful for applications. We show that a simple property of the network---the depth of communication---fully determines the scope for belief manipulation. Finally, we illustrate how a holistic use of linear-programming duality helps to characterize the solution to the optimal seeding problem. Our theory offers insights into the design of advertisement and political campaigns that are robust to (or leverage on) information spillovers.
Texte intégral
Régulation et Environnement
Du 07/10/2019 de 12:00 à 13:00
salle R1-13, campus Jourdan - 75014 Paris
LISKI Matti (Aalto University)
Do consumers gain when new technologies improve the efficiency of goods trade?
écrit avec Ivo Vehviläinen
This paper points out the basic price theory predictions for the consumer welfare gain from new technologies that improve the efficiency of goods trade. Micro-data on over 140 million of bids from three electricity markets reveals strikingly different consumer welfare impacts from new technologies. Consistent with the theory, the results can be explained by structural differences in excess demand: its convexity (concavity) is a determinant of consumers’ gain (loss).