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.

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。

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With the empirical research, this paper analyzes the contributions to rural labor transfer promoted by the improvement of the industrialization level in different.

本文通过实证研究，分析了各地区工业化水平的提高对转移农村剩余劳动力的贡献。

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It was this brave, industrious, economic, and quiet labor force that had made indelible contributions to the completion of the Pacific Railroads.

正是这支不畏艰险、勤劳朴素、沉默奉献的生力军，为太平洋铁路的建成做出了不可磨灭的贡献。

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Companies providing services that help politicians raise money have to be very careful not to run afoul of campaign finance regulations, which prohibit corporations and labor unions from facilitating contributions to political campaigns or committees.

FORBES: Magazine Article

The White House confirms that President Bill Clinton will send a letter to the Federal Election Commission petitioning the agency to outlaw the large contributions from wealthy donors, corporations and labor unions known as soft money.

CNN: AllPolitics - Clinton To Ask FEC To Ban Soft Money

It also plans to unshackle health-care costs from labor costs by freezing the amount employers pay into the system and shifting from income-based contributions toward a flat-rate health insurance premium.

WSJ: Germany Strains to Fund Health Care for All