Dynamics of Information Exchange in Endogenous Social Networks
AbstractWe develop a model of information exchange through communication and investigate its implications for information aggregation in large societies. An underlying state determines payoffs from different actions. Agents decide which others to form a costly communication link with incurring the associated cost. After receiving a private signal correlated with the underlying state, they exchange information over the induced communication network until taking an (irreversible) action. We define asymptotic learning as the fraction of agents taking the correct action converging to one in probability as a society grows large. Under truthful communication, we show that asymptotic learning occurs if (and under some additional conditions, also only if) in the induced communication network most agents are a short distance away from "information hubs", which receive and distribute a large amount of information. Asymptotic learning therefore requires information to be aggregated in the hands of a few agents. We also show that while truthful communication may not always be a best response, it is an equilibrium when the communication network induces asymptotic learning. Moreover, we contrast equilibrium behavior with a socially optimal strategy profile, i.e., a profile that maximizes aggregate welfare. We show that when the network induces asymptotic learning, equilibrium behavior leads to maximum aggregate welfare, but this may not be the case when asymptotic learning does not occur. We then provide a systematic investigation of what types of cost structures and associated social cliques (consisting of groups of individuals linked to each other at zero cost, such as friendship networks) ensure the emergence of communication networks that lead to asymptotic learning. Our result shows that societies with too many and sufficiently large social cliques do not induce asymptotic learning, because each social clique would have sufficient information by itself, making communicatio
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Bibliographic InfoPaper provided by David K. Levine in its series Levine's Working Paper Archive with number 661465000000000216.
Date of creation: 08 Oct 2010
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Other versions of this item:
- Bimpikis, Kostas & Ozdaglar, Asuman & Acemoglu, Daron, 2014. "Dynamics of information exchange in endogenous social networks," Theoretical Economics, Econometric Society, vol. 9(1), January.
- Daron Acemoglu & Kostas Bimpikis & Asuman Ozdaglar, 2010. "Dynamics of Information Exchange in Endogenous Social Networks," NBER Working Papers 16410, National Bureau of Economic Research, Inc.
- C72 - Mathematical and Quantitative Methods - - Game Theory and Bargaining Theory - - - Noncooperative Games
- D82 - Microeconomics - - Information, Knowledge, and Uncertainty - - - Asymmetric and Private Information; Mechanism Design
- D83 - Microeconomics - - Information, Knowledge, and Uncertainty - - - Search, Learning, and Information
- D85 - Microeconomics - - Information, Knowledge, and Uncertainty - - - Network Formation
This paper has been announced in the following NEP Reports:
- NEP-ALL-2010-10-23 (All new papers)
- NEP-CTA-2010-10-23 (Contract Theory & Applications)
- NEP-ICT-2010-10-23 (Information & Communication Technologies)
- NEP-NET-2010-10-23 (Network Economics)
- NEP-SOC-2010-10-23 (Social Norms & Social Capital)
Please report citation or reference errors to , or , if you are the registered author of the cited work, log in to your RePEc Author Service profile, click on "citations" and make appropriate adjustments.:
- Galeotti, Andrea & Goyal, Sanjeev & Kamphorst, Jurjen, 2006.
"Network formation with heterogeneous players,"
Games and Economic Behavior,
Elsevier, vol. 54(2), pages 353-372, February.
- Andrea Galeotti & Sanjeev Goyal & Jurjen Kamphorst, 2003. "Network Formation with Heterogeneous Players," Economics Discussion Papers 562, University of Essex, Department of Economics.
- Andrea Galeotti & Sanjeev Goyal, 2002. "Network Formation with Heterogeneous Players," Tinbergen Institute Discussion Papers 02-069/1, Tinbergen Institute.
- Jeanne Hagenbach & Frédéric Koessler, 2008.
"Strategic communication networks,"
PSE Working Papers
- Jeanne Hagenbach & Frédéric Koessler, 2009. "Strategic communication networks," Documents de travail du Centre d'Economie de la Sorbonne 09005, Université Panthéon-Sorbonne (Paris 1), Centre d'Economie de la Sorbonne.
- David A. Reinstein & Christopher M. Snyder, 2005. "THE INFLUENCE OF EXPERT REVIEWS ON CONSUMER DEMAND FOR EXPERIENCE GOODS: A CASE STUDY OF MOVIE CRITICS -super-* ," Journal of Industrial Economics, Wiley Blackwell, vol. 53(1), pages 27-51, 03.
- Andrea Galeotti & Christian Ghiglino & Francesco Squintani, 2009. "Strategic Information Transmission in Networks," Economics Discussion Papers 668, University of Essex, Department of Economics.
- Darrell DUFFIE & Semyon MALAMUD & Gustavo MANSO, .
"Information Percolation with Equilibrium Search Dynamics,"
Swiss Finance Institute Research Paper Series
09-02, Swiss Finance Institute.
- Darrell Duffie & Semyon Malamud & Gustavo Manso, 2009. "Information Percolation With Equilibrium Search Dynamics," Econometrica, Econometric Society, vol. 77(5), pages 1513-1574, 09.
- repec:fth:stanho:e-89-7 is not listed on IDEAS
- Oriana Bandiera & Imran Rasul, 2006.
"Social Networks and Technology Adoption in Northern Mozambique,"
Royal Economic Society, vol. 116(514), pages 869-902, October.
- Oriana Bandiera & Imran Rasul, 2002. "Social Networks and Technology Adoption in Northern Mozambique," STICERD - Development Economics Papers - From 2008 this series has been superseded by Economic Organisation and Public Policy Discussion Papers 35, Suntory and Toyota International Centres for Economics and Related Disciplines, LSE.
- Bandiera, Oriana & Rasul, Imran, 2002. "Social Networks and Technology Adoption in Northern Mozambique," CEPR Discussion Papers 3341, C.E.P.R. Discussion Papers.
- Oriana Bandiera & Imran Rasul, 2002. "Social networks and technology adoption in Northern Mozambique," LSE Research Online Documents on Economics 3539, London School of Economics and Political Science, LSE Library.
- Smith, L, 1996.
"Social Learning in a Changing World,"
96-34, Massachusetts Institute of Technology (MIT), Department of Economics.
- Ambrus, Attila & Azevedo, Eduardo M. & Kamada, Yuichiro, 2013. "Hierarchical cheap talk," Theoretical Economics, Econometric Society, vol. 8(1), January.
- Andrea Galeotti, 2004.
"One-way Flow Networks: the Role of Heterogeneity,"
Tinbergen Institute Discussion Papers
04-031/1, Tinbergen Institute.
- Nair, Harikesh S. & Manchanda, Puneet & Bhatia, Tulikaa, 2006. "Asymmetric Peer Effects in Physician Prescription Behavior: The Role of Opinion Leaders," Research Papers 1970, Stanford University, Graduate School of Business.
- Hojman, Daniel A. & Szeidl, Adam, 2008. "Core and periphery in networks," Journal of Economic Theory, Elsevier, vol. 139(1), pages 295-309, March.
- Sanjeev Goyal, 2007.
"Introduction to Connections: An Introduction to the Economics of Networks
[Connections: An Introduction to the Economics of Networks]," Introductory Chapters, Princeton University Press.
- Bar Ifrach & Costis Maglaras & Marco Scarsini, 2011.
"Monopoly Pricing in the Presence of Social Learning,"
11-11, NET Institute, revised Nov 2011.
- Bar Ifrach & Costis Maglaras & Marco Scarsini, 2012. "Monopoly Pricing in the Presence of Social Learning," Working Papers 12-01, NET Institute, revised Sep 2012.
- Daniel Andrei & Bruce Carlin & Michael Hasler, 2014. "Model Disagreement and Economic Outlook," NBER Working Papers 20190, National Bureau of Economic Research, Inc.
- Garcia, Daniel, 2012. "Communication and Information Acquisition in Networks," MPRA Paper 55481, University Library of Munich, Germany, revised 24 Apr 2014.
- Pietro Battiston & Luca Stanca, 2014. "Boundedly Rational Opinion Dynamics in Directed Social Networks: Theory and Experimental Evidence," Working Papers 267, University of Milano-Bicocca, Department of Economics, revised Jan 2014.
- Carlos Lever Guzmán, 2010. "Strategic Spending in Voting Competitions with Social Networks," Working Papers 2010-16, Banco de México.
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