経済厚生に関する比較静学 : 地域別価格のメカニズムに関する理論的分析
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概要
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This paper analyzes the change of social welfare and the mechanism of regional price theoretically. It is assumed that there exist a firm and homogeneous consumers in a product market. The firm monopolistically maximizes its profit subject to the market size and its marginal cost. We implement comparative statics with respect to a parameter which is regarded as an input price and prove two main conclusions as follows. On the condition that the input price elasticity of "willingness to pay" is larger than the input price elasticity of "marginal price", the rise in the input price increases the equilibrium quantity of output. Moreover, the assumption is also a sufficient condition that the rise in the input price increases the social welfare in equilibrium.