它既包含了理论的贡献，诸如最优化收入及商品课税理论，也包含了实证研究，例如课税如何影响劳动力供给的研究。
It covers both theoretical contributions, such as the theory of optimal income and commodity taxation, as well as empirical work, such as the study of how taxes affect labor supply.
增值税是以商品或应税劳务的增值额为课税对象的一种流转税。
Value added tax is a kind of intermediate tax with its commodities and taxable Labour services as the object of taxation.
增值税是以商品或应税劳务的增值额为课税对象的一种流转税。
Value added tax is a kind of intermediate tax with its commodities and taxable Labour services as the object of taxation.
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