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Introducing Imperfect Competition in CGE Models: Technical Aspects and Implications

  • Roberto Roson

    ()

This paper considers the technical aspects and the consequences, in terms of simulation results and policy assessment, of introducing imperfect competition in a CGE model. The modifications to the standard CGE framework needed to model imperfect competition in some industries are briefly discussed. Next, the paper examines whether, how much and why, those changes may affect the qualitative output a typical simulation experiment. It is argued that technical choices made in designing the model structure may have a significant impact on the model behavior. This is especially evident when the model output of an imperfect competition closure is compared with the one of a standard closure, assuming perfect competition. As an illustration, a simulation of agricultural trade liberalization is analyzed. Results from the same simulation exercise, but produced by alternative model formulations (one standard competitive and three imperfect competition variants) are presented and discussed. It is found that having imperfect competition in a CGE model does matter in terms of simulation results. Furthermore, alternative formulations of imperfect competition typically bring about quite different findings and implications.

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File URL: http://hdl.handle.net/10.1007/s10614-006-9034-6
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Article provided by Society for Computational Economics in its journal Computational Economics.

Volume (Year): 28 (2006)
Issue (Month): 1 (August)
Pages: 29-49

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Handle: RePEc:kap:compec:v:28:y:2006:i:1:p:29-49
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  1. Harrison, Glenn W & Rutherford, Thomas F & Tarr, David G, 1997. "Quantifying the Uruguay Round," Economic Journal, Royal Economic Society, vol. 107(444), pages 1405-30, September.
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  3. Kaludura Abayasiri-Silva, 1999. "Market Power in Australian Manufacturing Industry: A Confirmation of Hall's Hypothesis," Centre of Policy Studies/IMPACT Centre Working Papers g-132, Victoria University, Centre of Policy Studies/IMPACT Centre.
  4. Francois, Joseph, 1998. "Scale Economies and Imperfect Competition in the GTAP Model," GTAP Technical Papers 317, Center for Global Trade Analysis, Department of Agricultural Economics, Purdue University.
  5. Harrison, W Jill & Pearson, K R, 1996. "Computing Solutions for Large General Equilibrium Models Using GEMPACK," Computational Economics, Society for Computational Economics, vol. 9(2), pages 83-127, May.
  6. Masahisa Fujita & Paul Krugman & Anthony J. Venables, 2001. "The Spatial Economy: Cities, Regions, and International Trade," MIT Press Books, The MIT Press, edition 1, volume 1, number 0262561476, June.
  7. Jean, Sébastien & Guérin, Jean-Louis & Decreux, Yvan & Bchir, Mohamed Hedi, 2002. "MIRAGE, a Computable General Equilibrium Model for Trade Policy Analysis," Economics Papers from University Paris Dauphine 123456789/6497, Paris Dauphine University.
  8. Joaquim Oliveira Martins & Stefano Scarpetta & Dirk Pilat, 1996. "Mark-Up Ratios in Manufacturing Industries: Estimates for 14 OECD Countries," OECD Economics Department Working Papers 162, OECD Publishing.
  9. Thomas W. Hertel & Padma Swaminathan, 1996. "Introducing Monopolistic Competition into the GTAP Model," GTAP Technical Papers 309, Center for Global Trade Analysis, Department of Agricultural Economics, Purdue University.
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