IDEAS home Printed from https://ideas.repec.org/
MyIDEAS: Login to save this paper or follow this series

Market Experimentation in a Dynamic Differentiated-Goods Duopoly

  • Godfrey Keller
  • Sven Rady

We study the evolution of prices in a symmetric duopoly where firms are uncertain about the degree of product differentiation. Customers sometimes perceive the products as close substitutes, sometimes as highly differentiated. Firms learn about their competitive environment from the quantities sold and a background signal. As the information of the market outcomes increases with the price differential, there is scope for active learning. In a setting with linear demand curves, we derive firms' pricing strategies as payoff-symmetric mixed or correlated Markov perfect equilibria of a stochastic differential game where the common posterior belief is the natural state variable. When information has low value, firms charge the same price as would be set by myopic players, and there is no price dispersion. When firms value information more highly, on the other hand, they actively learn by creating price dispersion. This market experimentation is transient, and most likely to be observed when the firms' environment changes sufficiently often, but not too frequently.

If you experience problems downloading a file, check if you have the proper application to view it first. In case of further problems read the IDEAS help page. Note that these files are not on the IDEAS site. Please be patient as the files may be large.

File URL: http://sticerd.lse.ac.uk/dps/te/te369.pdf
Download Restriction: no

Paper provided by Suntory and Toyota International Centres for Economics and Related Disciplines, LSE in its series STICERD - Theoretical Economics Paper Series with number 369.

as
in new window

Length:
Date of creation: Jul 1999
Date of revision:
Handle: RePEc:cep:stitep:369
Contact details of provider: Web page: http://sticerd.lse.ac.uk/_new/publications/default.asp

References listed on IDEAS
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.:

as in new window
  1. Rob, Rafael, 1991. "Learning and Capacity Expansion under Demand Uncertainty," Review of Economic Studies, Wiley Blackwell, vol. 58(4), pages 655-75, July.
  2. Keller, Godfrey & Rady, Sven, 1999. "Optimal Experimentation in a Changing Environment," Review of Economic Studies, Wiley Blackwell, vol. 66(3), pages 475-507, July.
  3. Burdett, Kenneth & Coles, Melvyn G., 1997. "Steady State Price Distributions in a Noisy Search Equilibrium," Journal of Economic Theory, Elsevier, vol. 72(1), pages 1-32, January.
  4. Reinganum, Jennifer F, 1979. "A Simple Model of Equilibrium Price Dispersion," Journal of Political Economy, University of Chicago Press, vol. 87(4), pages 851-58, August.
  5. Harris, C., 1993. "Generalized Solutions of Stochastic Differential Games in One Dimension," Papers 44, Boston University - Industry Studies Programme.
  6. Dirk Bergemann & Juuso Valimaki, 1996. "Market Experimentation and Pricing," Cowles Foundation Discussion Papers 1122, Cowles Foundation for Research in Economics, Yale University.
  7. McLennan, Andrew, 1984. "Price dispersion and incomplete learning in the long run," Journal of Economic Dynamics and Control, Elsevier, vol. 7(3), pages 331-347, September.
  8. Mirman, L.J. & Samuelson, L. & Schlee, E.E., 1991. "Strategic information manipulation in duopolies," Discussion Paper 1991-37, Tilburg University, Center for Economic Research.
  9. Peter Diamond, 1985. "Consumer Differences and Prices in a Search Model," Working papers 404, Massachusetts Institute of Technology (MIT), Department of Economics.
  10. Mirman,Leonard & Samuelson,Larry & Urbano,Amparo, . "Duopoly signal jamming," Discussion Paper Serie B 199, University of Bonn, Germany.
  11. Burdett, Kenneth & Judd, Kenneth L, 1983. "Equilibrium Price Dispersion," Econometrica, Econometric Society, vol. 51(4), pages 955-69, July.
  12. Michael H. Riordan, 1985. "Imperfect Information and Dynamic Conjectural Variations," RAND Journal of Economics, The RAND Corporation, vol. 16(1), pages 41-50, Spring.
  13. Caplin, Andrew & Leahy, John V, 1993. "Sectoral Shocks, Learning, and Aggregate Fluctuations," Review of Economic Studies, Wiley Blackwell, vol. 60(4), pages 777-94, October.
  14. Salop, Steven & Stiglitz, Joseph E, 1977. "Bargains and Ripoffs: A Model of Monopolistically Competitive Price Dispersion," Review of Economic Studies, Wiley Blackwell, vol. 44(3), pages 493-510, October.
  15. Rothschild, Michael, 1974. "A two-armed bandit theory of market pricing," Journal of Economic Theory, Elsevier, vol. 9(2), pages 185-202, October.
  16. Fishman, Arthur & Rob, Rafael, 1998. "Experimentation and Competition," Journal of Economic Theory, Elsevier, vol. 78(2), pages 299-320, February.
  17. Gale, D. & Chamley, C., 1992. "Information Revelation and Strategic Delay in a Model of Investment," Papers 10, Boston University - Department of Economics.
  18. Dirk Bergemann & Juuso Valimaki, 1996. "Market Diffusion with Two-Sided Learning," Cowles Foundation Discussion Papers 1138, Cowles Foundation for Research in Economics, Yale University.
  19. Aghion, P. & Espinoza, M.P. & Jullien, B., 1990. "Dynamic Duopoly With Learning Through Market Experimentation," DELTA Working Papers 90-13, DELTA (Ecole normale supérieure).
  20. Felli, Leonardo & Harris, Christopher, 1996. "Learning, Wage Dynamics, and Firm-Specific Human Capital," Journal of Political Economy, University of Chicago Press, vol. 104(4), pages 838-68, August.
  21. Slade, Margaret E, 1989. "Price Wars in Price-Setting Supergames," Economica, London School of Economics and Political Science, vol. 56(223), pages 295-310, August.
  22. Patrick Bolton & Christopher Harris, 1999. "Strategic Experimentation," Econometrica, Econometric Society, vol. 67(2), pages 349-374, March.
  23. Harrington Jr. , Joseph E., 1995. "Experimentation and Learning in a Differentiated-Products Duopoly," Journal of Economic Theory, Elsevier, vol. 66(1), pages 275-288, June.
Full references (including those not matched with items on IDEAS)

This item is not listed on Wikipedia, on a reading list or among the top items on IDEAS.

When requesting a correction, please mention this item's handle: RePEc:cep:stitep:369. See general information about how to correct material in RePEc.

For technical questions regarding this item, or to correct its authors, title, abstract, bibliographic or download information, contact: ()

If you have authored this item and are not yet registered with RePEc, we encourage you to do it here. This allows to link your profile to this item. It also allows you to accept potential citations to this item that we are uncertain about.

If references are entirely missing, you can add them using this form.

If the full references list an item that is present in RePEc, but the system did not link to it, you can help with this form.

If you know of missing items citing this one, you can help us creating those links by adding the relevant references in the same way as above, for each refering item. If you are a registered author of this item, you may also want to check the "citations" tab in your profile, as there may be some citations waiting for confirmation.

Please note that corrections may take a couple of weeks to filter through the various RePEc services.

This information is provided to you by IDEAS at the Research Division of the Federal Reserve Bank of St. Louis using RePEc data.