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Competition in Persuasion

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  • Matthew Gentzkow
  • Emir Kamenica

Abstract

Does competition among persuaders increase the extent of information revealed? We study ex ante symmetric information games where a number of senders choose what information to gather and communicate to a receiver, who takes a non-contractible action that affects the welfare of all players. We characterize the information revealed in pure-strategy equilibria. We consider three ways of increasing competition among senders: (i) moving from collusive to non-cooperative play, (ii) introducing additional senders, and (iii) decreasing the alignment of senders' preferences. For each of these notions, we establish that increasing competition cannot decrease the amount of information revealed, and will in a certain sense tend to increase it.

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Paper provided by National Bureau of Economic Research, Inc in its series NBER Working Papers with number 17436.

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Date of creation: Sep 2011
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Handle: RePEc:nbr:nberwo:17436

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  1. Martimort, David & Stole, Lars, 2011. "Aggregate Representations of Aggregate Games," MPRA Paper 32871, University Library of Munich, Germany.
  2. Paul R. Milgrom, 1981. "Good News and Bad News: Representation Theorems and Applications," Bell Journal of Economics, The RAND Corporation, vol. 12(2), pages 380-391, Autumn.
  3. Marco Battaglini, 2002. "Multiple Referrals and Multidimensional Cheap Talk," Econometrica, Econometric Society, vol. 70(4), pages 1379-1401, July.
  4. Leland, Hayne E, 1981. "The Informational Role of Warranties and Private Disclosure about Product Quality: Comment," Journal of Law and Economics, University of Chicago Press, vol. 24(3), pages 485-89, December.
  5. Grossman, Sanford J, 1981. "The Informational Role of Warranties and Private Disclosure about Product Quality," Journal of Law and Economics, University of Chicago Press, vol. 24(3), pages 461-83, December.
  6. Milgrom, Paul & Shannon, Chris, 1994. "Monotone Comparative Statics," Econometrica, Econometric Society, vol. 62(1), pages 157-80, January.
  7. Brocas, Isabelle & Carrillo, Juan D & Palfrey, Thomas R, 2009. "Information Gatekeepers: Theory and Experimental Evidence," CEPR Discussion Papers 7457, C.E.P.R. Discussion Papers.
  8. Paul R. Milgrom & John Roberts, 1985. "Relying on the Information of Interested Parties," Cowles Foundation Discussion Papers 749, Cowles Foundation for Research in Economics, Yale University.
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Blog mentions

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  1. “Competition in Persuasion,” M. Gentzkow & E. Kamenica (2012)
    by afinetheorem in A Fine Theorem on 2014-04-17 19:34:59
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Cited by:
  1. Galasso, Vincenzo & Nannicini, Tommaso, 2013. "Men Vote in Mars, Women Vote in Venus: A Survey Experiment in the Field," CEPR Discussion Papers 9547, C.E.P.R. Discussion Papers.
  2. Isabelle Brocas & Juan Carrillo & Thomas Palfrey, 2012. "Information gatekeepers: theory and experimental evidence," Economic Theory, Springer, vol. 51(3), pages 649-676, November.
  3. Raphael Boleslavsky & Christopher Cotton, 2011. "Learning more by doing less," Working Papers 2012-1, University of Miami, Department of Economics.
  4. Ennio Bilancini & Leonardo Boncinelli, 2014. "Persuasion with Reference Cues and Elaboration Costs," Working Papers - Economics wp2014_04.rdf, Universita' degli Studi di Firenze, Dipartimento di Scienze per l'Economia e l'Impresa.
  5. Irene Valsecchi, 2013. "The expert problem: a survey," Economics of Governance, Springer, vol. 14(4), pages 303-331, November.

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