Scale Economies and Imperfect Competition in WorldScan
AbstractWorldScan, the CGE model for international policy analysis and long-term scenario studies, is applied regularly at the CPB. The production technology in the model is that of constant returns to scale and the market structure is characterized by perfect competition. However, it is a well known fact that many sectors such as manufacturing and service sectors feature increasing returns and firms compete imperfectly. To give the model more realism, it is therefore necessary to expand the model. Besides that, several research projects require an identification of scale economies in order to perform a sound welfare analysis. In this memorandum, I review the literature on scale economies and imperfect competition and analyze which approach is most suitable to implement in WorldScan. For the objectives at hand it appears most efficient to expand the model with an extended Dixit-Stiglitz approach. Simulations with an aggregated version of WorldScan show that the effects of incorporating scale economies are significant. Evidently, in a liberalisation scenario, sectors with increasing returns can exploit their technology more than sectors with constant returns, implying considerable increases in production and exports for these sectors. Concluding, this expansion of the model allows for an identification of formerly unidentified welfare effects. Download PDF-bestand (564Kbytes)
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Bibliographic InfoPaper provided by CPB Netherlands Bureau for Economic Policy Analysis in its series CPB Memorandum with number 140.
Date of creation: Feb 2006
Date of revision:
Find related papers by JEL classification:
- D43 - Microeconomics - - Market Structure and Pricing - - - Oligopoly and Other Forms of Market Imperfection
- D58 - Microeconomics - - General Equilibrium and Disequilibrium - - - Computable and Other Applied General Equilibrium Models
- F12 - International Economics - - Trade - - - Models of Trade with Imperfect Competition and Scale Economies; Fragmentation
- L13 - Industrial Organization - - Market Structure, Firm Strategy, and Market Performance - - - Oligopoly and Other Imperfect Markets
This paper has been announced in the following NEP Reports:
- NEP-ALL-2006-03-18 (All new papers)
- NEP-COM-2006-03-18 (Industrial Competition)
- NEP-INT-2006-03-18 (International Trade)
- NEP-MIC-2006-03-18 (Microeconomics)
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.:
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"Monopolistic Competition and Optimum Product Diversity,"
American Economic Review,
American Economic Association, vol. 67(3), pages 297-308, June.
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- de Bruijn, Roland & Kox, Henk & Lejour, Arjan, 2008. "Economic benefits of an Integrated European Market for Services," Journal of Policy Modeling, Elsevier, vol. 30(2), pages 301-319.
- Christian Dreger & Manuel Art�s & Rosina Moreno & RaÃºl Ramos & Jordi Suri�ach, 2007. "Study on the feasibility of a tool to measure the macroeconomic impact of structural reforms," European Economy - Economic Papers 272, Directorate General Economic and Monetary Affairs (DG ECFIN), European Commission.
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