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A Search Cost Model of Obfuscation

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Author Info
Glenn Ellison
Alexander Wolitzky

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Abstract

This paper develops search-theoretic models in which it is individually rational for firms to engage in obfuscation. It considers oligopoly competition between firms selling a homogeneous good to a population of rational consumers who incur search costs to learn each firm's price. Search costs are endogenized: obfuscation is equated with unobservable actions that make it more time-consuming to inspect a product and learn its price. We note two mechanisms by which obfuscation can affect consumer beliefs about future search costs: a direct effect that applies when search costs are convex in time spent searching and a signal-jamming effect that applies when an informational link is present. As long as obfuscation is costless for firms, the presence of either of these mechanisms guarantees that obfuscation must occur in equilibrium, unless consumer search costs are already so high that consumers are willing to purchase at the highest equilibrium price in the absence of obfuscation. Changes in consumer search costs are at least partially offset by changes in the equilibrium level of obfuscation, raising doubts about whether reductions in consumer search costs must make markets more competitive. We also examine patterns of obfuscation and show that higher markups are usually associated with more obfuscation.

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Paper provided by National Bureau of Economic Research, Inc in its series NBER Working Papers with number 15237.

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Date of creation: Aug 2009
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Handle: RePEc:nbr:nberwo:15237

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Find related papers by JEL classification:
D43 - Microeconomics - - Market Structure and Pricing - - - Oligopoly and Other Forms of Market Imperfection
D83 - Microeconomics - - Information, Knowledge, and Uncertainty - - - Search, Learning, and Information
L13 - Industrial Organization - - Market Structure, Firm Strategy, and Market Performance - - - Oligopoly and Other Imperfect Markets

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References listed on IDEAS
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  1. Glenn Ellison & Sara Fisher Ellison, 2009. "Search, Obfuscation, and Price Elasticities on the Internet," Econometrica, Econometric Society, vol. 77(2), pages 427-452, 03. [Downloadable!] (restricted)
    Other versions:
  2. Weitzman, Martin L, 1979. "Optimal Search for the Best Alternative," Econometrica, Econometric Society, vol. 47(3), pages 641-54, May. [Downloadable!] (restricted)
    Other versions:
  3. Burdett, Kenneth & Judd, Kenneth L, 1983. "Equilibrium Price Dispersion," Econometrica, Econometric Society, vol. 51(4), pages 955-69, July. [Downloadable!] (restricted)
  4. Spiegler, Ran, 2006. "Competition over agents with boundedly rational expectations," Theoretical Economics, Society for Economic Theory, vol. 1(2), pages 207-231, June. [Downloadable!]
  5. Steven Salop & Joseph Stiglitz, 1977. "Bargains and ripoffs: a model of monopolistically competitive price dispersion," Special Studies Papers 94, Board of Governors of the Federal Reserve System (U.S.).
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  6. Xavier Gabaix & David Laibson, 2006. "Shrouded Attributes, Consumer Myopia, and Information Suppression in Competitive Markets," The Quarterly Journal of Economics, MIT Press, vol. 121(2), pages 505-540, May. [Downloadable!] (restricted)
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  7. Michael R. Baye & John Morgan, 2001. "Information Gatekeepers on the Internet and the Competitiveness of Homogeneous Product Markets," American Economic Review, American Economic Association, vol. 91(3), pages 454-474, June. [Downloadable!] (restricted)
  8. Varian, Hal R, 1980. "A Model of Sales," American Economic Review, American Economic Association, vol. 70(4), pages 651-59, September. [Downloadable!] (restricted)
  9. Michael R. Baye & John Morgan & Patrick Scholten, 2006. "Information, Search, and Price Dispersion," Working Papers 2006-11, Indiana University, Kelley School of Business, Department of Business Economics and Public Policy. [Downloadable!]
  10. Kohn, Meir G. & Shavell, Steven, 1974. "The theory of search," Journal of Economic Theory, Elsevier, vol. 9(2), pages 93-123, October. [Downloadable!] (restricted)
  11. Rosenthal, Robert W, 1980. "A Model in Which an Increase in the Number of Sellers Leads to a Higher Price," Econometrica, Econometric Society, vol. 48(6), pages 1575-79, September. [Downloadable!] (restricted)
  12. 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. [Downloadable!] (restricted)
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  13. Diamond, Peter A., 1971. "A model of price adjustment," Journal of Economic Theory, Elsevier, vol. 3(2), pages 156-168, June. [Downloadable!] (restricted)
  14. Stahl, Dale O, II, 1989. "Oligopolistic Pricing with Sequential Consumer Search," American Economic Review, American Economic Association, vol. 79(4), pages 700-712, September. [Downloadable!] (restricted)
  15. Chris M. Wilson, 2008. "Ordered Search and Equilibrium Obfuscation," Economics Series Working Papers 401, University of Oxford, Department of Economics. [Downloadable!]
  16. Butters, Gerard R, 1977. "Equilibrium Distributions of Sales and Advertising Prices," Review of Economic Studies, Blackwell Publishing, vol. 44(3), pages 465-91, October. [Downloadable!] (restricted)
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