複数財の寡占的加工業者を含む空間均衡モデル

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Kubo, Kano and Maeda (2008) which is based on the work of Kawaguchi (2003) developed a spatial equilibrium model, incorporating oligopolistic processing firms. The oligopolistic processing firms are characterized as the firm which can hold a great control over their products' Prices against the producers in raw material market and the consumers in processed goods market. In this paper, we revise the spatial equilibrium model of Kubo, Kano and Maeda (2008) by considering oligopolistic processing firms which make some processed goods from a raw material. Also, analyses simulations with the use of the model are performed under the four scenarios, 1) a perfectly competitive in both raw material market and processed goods market, 2) supply-oligopolistic in processed goods market, 3) demand-oligopolistic in raw material market, 4) both supply-oligopolistic in processed goods market and demand-oligopolistic in raw material market. As a result, the following facts are yielded: oligopolistic processing firms in this study beat the Price down in raw material market and push up the Price in processed goods, which are more profitable than Price-takers.以上,本稿では,寡占的加工業者を含む複数財の空間均衡モデルの展開をおこなった.さらに,数値例をもとに, 市場構造の相違が均衡解に与える影響を分析した. 数値例の結果,寡占的加工業者が原材料の需要者および加工品の供給者として市場支配力をもつ場合の均衡量は, その他の市場支配力を部分的もしくは完全に持たない場合と比較して少なくなり,一方で,加工品市場価格と原材料市場価格の価格差は最も大きくなるという結果が得られた. 今後は,本稿で展開されたモデルを,国際貿易空間均衡モデルとして展開することである.
九州大学大学院農学研究院,Faculty of Agriculture, Kyushu Universityの論文
2008-10-29

複数財の寡占的加工業者を含む空間均衡モデル

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