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Pure Numbers Effects, Market Power, and Tacit Collusion in Posted Offer Markets

  • Douglas D. Davis

    ()

    (Department of Economics, VCU School of Business)

This paper studies the effects of seller concentration and static market power on tacit collusion in extensively repeated laboratory posted-offer markets. Contrary to the implications of some earlier research, we find that tacit collusion does not become pervasive with extensive repetition. In a ‘strong no power’ design persistently competitive outcomes are observed in markets with three or four sellers. Even duopolies are frequently competitive in this design. Unilateral market power raises prices, as predicted. However, static Nash predictions fail to organize outcomes across power treatments, because tacit collusion moves inversely with concentration. Excess capacity appears to explain observed tacit collusion levels.

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File URL: http://www.people.vcu.edu/~dddavis/working%20papers/Davis_01_09_09.pdf
File Function: Revised version, 2009
Download Restriction: no

Paper provided by VCU School of Business, Department of Economics in its series Working Papers with number 0603.

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Length: 27 pages
Date of creation: Sep 2006
Date of revision: Jan 2009
Handle: RePEc:vcu:wpaper:0603
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Web page: http://www.business.vcu.edu/economics

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  1. Douglas Davis & Oleg Korenok & Robert Reilly, 2010. "Cooperation without coordination: signaling, types and tacit collusion in laboratory oligopolies," Experimental Economics, Springer, vol. 13(1), pages 45-65, March.
  2. Douglas D. Davis & Oleg Korenok, 2009. "Posted Offer Markets In Near-Continuous Time: An Experimental Investigation," Economic Inquiry, Western Economic Association International, vol. 47(3), pages 449-466, 07.
  3. Smith, Vernon L, 1982. "Microeconomic Systems as an Experimental Science," American Economic Review, American Economic Association, vol. 72(5), pages 923-55, December.
  4. Deck, Cary A. & Wilson, Bart J., 2008. "Experimental gasoline markets," Journal of Economic Behavior & Organization, Elsevier, vol. 67(1), pages 134-149, July.
  5. Vernon L. Smith, 2003. "Constructivist and Ecological Rationality in Economics," American Economic Review, American Economic Association, vol. 93(3), pages 465-508, June.
  6. Binmore, Ken, 1999. "Why Experiment in Economics?," Economic Journal, Royal Economic Society, vol. 109(453), pages F16-24, February.
  7. Dufwenberg, Martin & Gneezy, Uri, 1998. "Price Competition and Market Concentration: An Experimental Study," Working Paper Series 1998:8, Uppsala University, Department of Economics.
  8. Cason, Timothy N. & Williams, Arlington W., 1990. "Competitive equilibrium convergence in a posted-offer market with extreme earnings inequities," Journal of Economic Behavior & Organization, Elsevier, vol. 14(3), pages 331-352, December.
  9. Douglas D. Davis & Korenok Oleg & Robert Reilly, 2007. "Re-matching, Information and Sequencing Effects in Posted Offer Markets," Working Papers 0701, VCU School of Business, Department of Economics, revised Oct 2007.
  10. Durham, Yvonne & McCabe, Kevin & Olson, Mark A. & Rassenti, Stephen & Smith, Vernon, 2004. "Oligopoly competition in fixed cost environments," International Journal of Industrial Organization, Elsevier, vol. 22(2), pages 147-162, February.
  11. Henrik Orzen, 2006. "Counterintuitive Number Effects in Experimental Oligopolies," Discussion Papers 2006-22, The Centre for Decision Research and Experimental Economics, School of Economics, University of Nottingham.
  12. Douglas D. Davis & Charles A. Holt, 1994. "Market Power and Mergers in Laboratory Markets with Posted Prices," RAND Journal of Economics, The RAND Corporation, vol. 25(3), pages 467-487, Autumn.
  13. Alger, Dan, 1987. "Laboratory Tests of Equilibrium Predictions with Disequilibrium Data," Review of Economic Studies, Wiley Blackwell, vol. 54(1), pages 105-45, January.
  14. Davis, Douglas D. & Wilson, Bart J., 2008. "Strategic buyers, horizontal mergers and synergies: An experimental investigation," International Journal of Industrial Organization, Elsevier, vol. 26(3), pages 643-661, May.
  15. Plott, Charles R., 1989. "An updated review of industrial organization: Applications of experimental methods," Handbook of Industrial Organization, in: R. Schmalensee & R. Willig (ed.), Handbook of Industrial Organization, edition 1, volume 2, chapter 19, pages 1109-1176 Elsevier.
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