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Profitability, concentration, imports and exports: the case of Taiwan's midstream petrochemical industries

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Based on an open-economy oligopoly model, causalities among domestic firms' price-cost margin (PCM), domestic concentration, import and export shares are derived and a simultaneous-equation system is established. By utilizing the 1989-1997 data of Taiwan's midstream petrochemical industries, three-stage least squares is used to estimate the system. The empirical results confirm the derived results, and demonstrate: (1) there exist simultaneous relationships among domestic PCM, domestic concentration, import and export shares; (2) import concentration affects domestic concentration positively, but affects domestic PCM, import and export shares negatively; (3) diversifying international markets improves domestic firms' PCM; (4) domestic firms seem to be in a situation of collusion.

Document Type: Research Article


Affiliations: Department of Economics, National Chengchi University, Taipei 116, Taiwan

Publication date: 2008-06-01

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