累进税率的累进程度取决于社会福利函数的类型和劳动供给弹性的大小。
Progressive degree of progressive tax rate depends on the type of Social welfare function and labour supply elasticity.
由于阿罗不可能性定理的提出，西方社会福利函数理论的研究进入了困惑时期；
With the rise of Arrow's impossibility theorem research in social welfare function in the West enters a stage of perplexity.
分析表明：当零售商仅具有买方垄断势力时，收取通道费会使零售商的利润增加，消费者剩余减少，对社会福利的影响取决于需求函数性质；
Analysis showed that:the case that the retailer both have the buyer and seller power, its welfare losses bigger than the case that only have the seller;
分析表明：当零售商仅具有买方垄断势力时，收取通道费会使零售商的利润增加，消费者剩余减少，对社会福利的影响取决于需求函数性质；
Analysis showed that:the case that the retailer both have the buyer and seller power, its welfare losses bigger than the case that only have the seller;
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